研究者詳細 - 中野　秀雄

An improved laser photo-detachment diagnostic for negative ion density measurement

Rattanawongnara E., Nakano H., Tsumori K., Nagaoka K., Osakabe M.

Journal of Instrumentation 19 巻 ( 11 ) 2024年11月

出版者・発行元：Journal of Instrumentation

A photo-detachment Langmuir probe is a crucial tool because it gives a point measurement of negative ion density. The detection circuitry of a photo-detachment diagnostic with nanosecond laser pulses is critical for the accuracy of the results. Applying the electromagnetic theory to the design of the photo-detachment system has allowed it to stabilize its frequency response up to -445 MHz, providing a significantly higher time resolution than in a common photo-detachment circuit setup. A systematic design rule is given in this paper to standardize the proper circuit. The new standard allows comparison between laboratories without concern for electronic parameter differences. The high-time resolution result shows three different peaks in the photo-detached electron current. This paper identified that the first peak is the most correlated to negative-ion density information, and the second and third peaks are related to background electrons interacting with build-up potential.

DOI： 10.1088/1748-0221/19/11/P11002

The Identification of a Target Gene of the Transcription Factor KojR and Elucidation of Its Role in Carbon Metabolism for Kojic Acid Biosynthesis in Aspergillus oryzae Open Access

Mizutani, T; Oka, H; Goto, R; Tsurigami, R; Maruyama, J; Shimizu, M; Kato, M; Nakano, H; Kojima, T

JOURNAL OF FUNGI 10 巻 ( 2 ) 2024年2月

記述言語：英語出版者・発行元：Journal of Fungi

DNA-binding transcription factors are broadly characterized as proteins that bind to specific sequences within genomic DNA and modulate the expression of downstream genes. This study focused on KojR, a transcription factor involved in the metabolism of kojic acid, which is an organic acid synthesized in Aspergillus oryzae and is known for its tyrosinase-inhibitory properties. However, the regulatory mechanism underlying KojR-mediated kojic acid synthesis remains unclear. Hence, we aimed to obtain a comprehensive identification of KojR-associated genes using genomic systematic evolution of ligands by exponential enrichment with high-throughput DNA sequencing (gSELEX-Seq) and RNA-Seq. During the genome-wide exploration of KojR-binding sites via gSELEX-Seq and identification of KojR-dependent differentially expressed genes (DEGs) using RNA-Seq, we confirmed that KojR preferentially binds to 5′-CGGCTAATGCGG-3′, and KojR directly regulates kojT, as was previously reported. We also observed that kojA expression, which may be controlled by KojR, was significantly reduced in a ΔkojR strain. Notably, no binding of KojR to the kojA promoter region was detected. Furthermore, certain KojR-dependent DEGs identified in the present study were associated with enzymes implicated in the carbon metabolic pathway of A. oryzae. This strongly indicates that KojR plays a central role in carbon metabolism in A. oryzae.

DOI： 10.3390/jof10020113

Bio-nanocapsules for oriented immobilization of DNA aptamers on aptasensors 査読有り

Iijima, M; Yamada, Y; Nakano, H; Nakayama, T; Kuroda, S

ANALYST 147 巻 ( 3 ) 頁： 489 - 495 2022年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Analyst

The oriented immobilization of sensing molecules (e.g., IgGs, receptors, lectins, and DNA aptamers) on sensor chips is particularly important for maximizing the potential of the sensing molecules, thereby enhancing the sensitivity and target-binding capacity of biosensors. We previously developed ∼30 nm bio-nanocapsules (ZZ-BNCs) consisting of the hepatitis B virus envelope L protein fused with the tandem form of protein A-derived IgG Fc-binding Z domain (ZZ-L protein). ZZ-BNC acts successfully as a scaffold, enhancing both the sensitivity and binding capacity of IgG, a Fc-fused receptor, and Fc-fused lectin to antigens, cytokines, and sugar chains through an oriented immobilization on a biosensor surface. To expand the versatility of ZZ-BNC, we modified ZZ-BNC by replacing the ZZ domain with a DNA-binding single-chain lambda Cro (scCro) domain, thereby developing scCro-BNC. The scCro-BNC was synthesized in yeast cells and homogeneously purified as ∼30 nm sized nanoparticles. In a quartz crystal microbalance, an scCro-BNC-coated sensor chip immobilized with thrombin-binding DNA aptamers showed an ∼5.5-fold higher thrombin-binding capacity and ∼6000-fold higher detection sensitivity than a sensor chip directly coated with DNA aptamers. In addition, the number of bound thrombin molecules per molecule of DNA aptamer increased by ∼7.8-fold with an scCro-BNC coating, consistent with the theoretical thrombin-binding capacity. Collectively, scCro-BNC was shown to perform as an ideal scaffold for maximizing the potential of the DNA aptamer by immobilizing it in an oriented manner. Facilitating a highly sensitive detection of various target molecules, these BNC-based scaffolds are expected to improve a wide range of biosensors while minimizing the number of sensing molecules required. This journal is

DOI： 10.1039/d1an02278d

Development of robust and rapid monoclonal antibody screening technology using cell-free protein synthesis

無細胞タンパク質合成系を利用した迅速抗体スクリーニング技術開発と実用化招待有り

加藤晃代, 中野秀雄, 兒島孝明, 永井里美

日本生物工学会会誌 99 巻 ( 2 ) 頁： 62 - 67 2021年2月

Ojima-Kato T., Nakano H., Kojima T., Nagai S.

Seibutsu-kogaku Kaishi 99 巻 ( 2 ) 頁： 62 - 67 2021年

Rapid Generation of Monoclonal Antibodies from Single B Cells by Ecobody Technology. Open Access

Ojima-Kato T, Morishita S, Uchida Y, Nagai S, Kojima T, Nakano H

Antibodies (Basel, Switzerland) 7 巻 ( 4 ) 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Antibodies

Single B cell sampling following to direct gene amplification and transient expression in animal cells has been recognized as powerful monoclonal antibodies (mAbs) screening strategies. Here we report Ecobody technology which allows mAbs screening from single B cells in two days This technology uses Escherichia coli cell-free protein synthesis (CFPS) for mAb expression. In the CFPS step, we employed our original techniques: (1) ‘Zipbody’ as a modified Fab (fragment of antigen binding) format, in which the active Fab formation is facilitated by adhesive leucine zipper peptides fused at the C-termini of the light and heavy chains; and (2) an N-terminal SKIK peptide tag that can markedly increase protein production. By the Ecobody technology, we demonstrated rapid screening of antigen specific mAbs from immunized rabbits and Epstein-Barr Virus infected human B cells. We further obtained rabbit mAbs in E. coli expression system yielding to 8.5 mg of purified proteins from 1 L bacterial culture.

DOI： 10.3390/antib7040038

Effect of Translation-Enhancing Nascent SKIK Peptide on the Arrest Peptides Containing Consecutive Proline Open Access

Nishikawa, Y; Fujikawa, R; Nakano, H; Kanamori, T; Ojima-Kato, T

ACS SYNTHETIC BIOLOGY 13 巻 ( 12 ) 頁： 3908 - 3916 2024年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ACS Synthetic Biology

Ribosome arrest peptides (RAPs) such as the SecM arrest peptide (SecM AP: FSTPVWISQAQGIRAGP) and WPPP with consecutive Pro residues are known to induce translational stalling in Escherichia coli. We demonstrate that the translation-enhancing SKIK peptide tag, which consists of four amino acid residues Ser-Lys-Ile-Lys, effectively alleviates translational arrest caused by WPPP. Moreover, the proximity between SKIK and WPPP significantly influences the extent of this alleviation, observed in both PURE cell-free protein synthesis and in vivo protein production systems, resulting in a substantial increase in the yield of proteins containing such RAPs. Furthermore, we unveil that nascent SKIK peptide tag and translation elongation factor P (EF-P) alleviate ribosome stalling in consecutive-Pro-rich protein to synergistically promote translation. A kinetic analysis based on the generation of superfolder green fluorescent protein under in vitro translation reaction reveals that the ribosome turnover is enhanced by more than 10-fold when the SKIK peptide tag is positioned immediately upstream of the SecM AP sequence. Our findings provide valuable insights into optimizing protein production processes, which are essential for advancing synthetic biology applications.

DOI： 10.1021/acssynbio.4c00221

Construction of transcript regulation mechanism prediction models based on binding motif environment of transcription factor AoXlnR in Aspergillus oryzae 国際誌

Oka, H; Kojima, T; Kato, R; Ihara, K; Nakano, H

JOURNAL OF BIOINFORMATICS AND COMPUTATIONAL BIOLOGY 22 巻 ( 03 ) 頁： 2450017 - 2450017 2024年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Bioinformatics and Computational Biology

DNA-binding transcription factors (TFs) play a central role in transcriptional regulation mechanisms, mainly through their specific binding to target sites on the genome and regulation of the expression of downstream genes. Therefore, a comprehensive analysis of the function of these TFs will lead to the understanding of various biological mechanisms. However, the functions of TFs in vivo are diverse and complicated, and the identified binding sites on the genome are not necessarily involved in the regulation of downstream gene expression. In this study, we investigated whether DNA structural information around the binding site of TFs can be used to predict the involvement of the binding site in the regulation of the expression of genes located downstream of the binding site. Specifically, we calculated the structural parameters based on the DNA shape around the DNA binding motif located upstream of the gene whose expression is directly regulated by one TF AoXlnR from Aspergillus oryzae, and showed that the presence or absence of expression regulation can be predicted from the sequence information with high accuracy (AUPRC=0.8-1.0) by machine learning incorporating these parameters.

DOI： 10.1142/S0219720024500173

Rapid and cost-effective epitope mapping using PURE ribosome display coupled with next-generation sequencing and bioinformatics Open Access

Substrate profiling of human transglutaminase 1 using cDNA display and next-generation sequencing 査読有り Open Access

Munaweera, TIK; Damnjanovic, J; Camagna, M; Nezu, M; Jia, BX; Hitomi, K; Nemoto, N; Nakano, H

BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY 88 巻 ( 6 ) 頁： 620 - 629 2024年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Bioscience, Biotechnology and Biochemistry

Human transglutaminase 1 (TG1) modulates skin development, while its involvement in diseases remains poorly understood, necessitating comprehensive exploration of its substrate interactions. To study the substrate profile of TG1, an in vitro selection system based on cDNA display technology was used to screen two peptide libraries with mutations at varying distance from the reactive glutamine. Next-generation sequencing and bioinformatics analysis of the selected DNA pools revealed a detailed TG1 substrate profile, indicating preferred and non-preferred amino acid sequences. The peptide sequence, AEQHKLPSKWPF, was identified showing high reactivity and specificity to TG1. The position weight matrix calculated from the per amino acid enrichment factors was employed to search human proteins using an in-house algorithm, revealing six known TG1 substrate proteins with high scores, alongside a list of candidate substrates currently under investigation. Our findings are expected to assist in future medical diagnoses and development of treatments for skin disorders.

DOI： 10.1093/bbb/zbae029

その他リンク： https://academic.oup.com/bbb/article-pdf/88/6/620/57805618/zbae029.pdf

Jia, BX; Ojima-Kato, T; Kojima, T; Nakano, H

JOURNAL OF BIOSCIENCE AND BIOENGINEERING 137 巻 ( 4 ) 頁： 321 - 328 2024年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Bioscience and Bioengineering

A novel, efficient and cost-effective approach for epitope identification of an antibody has been developed using a ribosome display platform. This platform, known as PURE ribosome display, utilizes an Escherichia coli-based reconstituted cell-free protein synthesis system (PURE system). It stabilizes the mRNA-ribosome-peptide complex via a ribosome-arrest peptide sequence. This system was complemented by next-generation sequencing (NGS) and an algorithm for analyzing binding epitopes. To showcase the effectiveness of this method, selection conditions were refined using the anti-PA tag monoclonal antibody with the PA tag peptide as a model. Subsequently, a random peptide library was constructed using 10 NNK triplet oligonucleotides via the PURE ribosome display. The resulting random peptide library-ribosome-mRNA complex was selected using a commercially available anti-HA (YPYDVPDYA) tag monoclonal antibody, followed by NGS and bioinformatic analysis. Our approach successfully identified the DVPDY sequence as an epitope within the hemagglutinin amino acid sequence, which was then experimentally validated. This platform provided a valuable tool for investigating continuous epitopes in antibodies.

DOI： 10.1016/j.jbiosc.2024.01.008

Nascent MSKIK peptide cancels ribosomal stalling by arrest peptides in Escherichia coli

Ojima-Kato, T; Nishikawa, Y; Furukawa, Y; Kojima, T; Nakano, H

JOURNAL OF BIOLOGICAL CHEMISTRY 299 巻 ( 5 ) 頁： 104676 - 104676 2023年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Biological Chemistry

The insertion of the DNA sequence encoding SKIK peptide adjacent to the M start codon of a difficult-to-express protein enhances protein production in Escherichia coli. In this report, we reveal that the increased production of the SKIK-tagged protein is not due to codon usage of the SKIK sequence. Furthermore, we found that insertion of SKIK or MSKIK just before the SecM arrest peptide (FSTPVWISQAQGIRAGP), which causes ribosomal stalling on mRNA, greatly increased the production of the protein containing the SecM arrest peptide in the E. coli–reconstituted cell-free protein synthesis system (PURE system). A similar translation enhancement phenomenon by MSKIK was observed for the CmlA leader peptide, a ribosome arrest peptide, whose arrest is induced by chloramphenicol. These results strongly suggest that the nascent MSKIK peptide prevents or releases ribosomal stalling immediately following its generation during the translation process, resulting in an increase of protein production.

DOI： 10.1016/j.jbc.2023.104676

Comprehensive analysis of transglutaminase substrate preference by cDNA display coupled with next-generation sequencing and bioinformatics Open Access

Damnjanovic, J; Odake, N; Fan, JC; Camagna, M; Jia, BX; Kojima, T; Nemoto, N; Hitomi, K; Nakano, H

SCIENTIFIC REPORTS 12 巻 ( 1 ) 頁： 13578 2022年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Scientific Reports

cDNA display is an in vitro display technology based on a covalent linkage between a protein and its corresponding mRNA/cDNA, widely used for the selection of proteins and peptides from large libraries (1012) in a high throughput manner, based on their binding affinity. Here, we developed a platform using cDNA display and next-generation sequencing (NGS) for rapid and comprehensive substrate profiling of transglutaminase 2 (TG2), an enzyme crosslinking glutamine and lysine residues in proteins. After screening and selection of the control peptide library randomized at the reactive glutamine, a combinatorial library of displayed peptides randomized at positions − 1, + 1, + 2, and + 3 from the reactive glutamine was screened followed by NGS and bioinformatic analysis, which indicated a strong preference of TG2 towards peptides with glutamine at position − 1 (Gln-Gln motif), and isoleucine or valine at position + 3. The highly enriched peptides indeed contained the indicated sequence and showed a higher reactivity as TG2 substrates than the peptide previously selected by phage display, thus representing the novel candidate peptide probes for TG2 research. Furthermore, the obtained information on substrate profiling can be used to identify potential TG2 protein targets. This platform will be further used for the substrate profiling of other TG isozymes, as well as for the selection and evolution of larger biomolecules.

DOI： 10.1038/s41598-022-17494-4

その他リンク： https://www.nature.com/articles/s41598-022-17494-4

Administration of Aspergillus oryzae suppresses DSS-induced colitis 国際誌 Open Access

Nomura, R; Tsuzuki, S; Kojima, T; Nagasawa, M; Sato, Y; Uefune, M; Baba, Y; Hayashi, T; Nakano, H; Kato, M; Shimizu, M

FOOD CHEMISTRY: MOLECULAR SCIENCES 4 巻頁： 100063 - 100063 2022年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Food Chemistry: Molecular Sciences

Aspergillus oryzae, a filamentous fungus, has long been used for the production of traditional Japanese foods. Here, we analyzed how A. oryzae administration affects the intestinal environment in mice. The results of 16S rRNA gene sequencing of the gut microbiota indicated that after the administration of heat-killed A. oryzae spores, the relative abundance of an anti-inflammatory Bifidobacterium pseudolongum strain became 2.0-fold greater than that of the control. Next, we examined the effect of A. oryzae spore administration on the development of colitis induced by dextran sodium sulfate in mice; we found that colitis was alleviated by not only heat-killed A. oryzae spores, but also the cell wall extracted from the spores. Our findings suggest that A. oryzae holds considerable potential for commercial application in the production of both traditional Japanese fermented foods and new foods with prebiotic functions.

DOI： 10.1016/j.fochms.2021.100063

Structures of an engineered phospholipase D with specificity for secondary alcohol transphosphatidylation: Insights into plasticity of substrate binding and activation. 招待有り査読有り国際共著

Samantha, A., Damnjanović, J., Iwasaki, Y., Nakano, H., and Vrielink, A.

Biochemical Journal 478 巻頁： 1749 - 1767 2021年5月

Structures of an engineered phospholipase D with specificity for secondary alcohol transphosphatidylation: insights into plasticity of substrate binding and activation Open Access

Samantha, A; Damnjanovic, J; Iwasaki, Y; Nakano, H; Vrielink, A

BIOCHEMICAL JOURNAL 478 巻 ( 9 ) 頁： 1749 - 1767 2021年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Biochemical Journal

Phospholipase D (PLD) is an enzyme useful for the enzymatic modification of phospholipids. In the presence of primary alcohols, the enzyme catalyses transphosphatidylation of the head group of phospholipid substrates to synthesise a modified phospholipid product. However, the enzyme is specific for primary alcohols and thus the limitation of the molecular size of the acceptor compounds has restricted the type of phospholipid species that can be synthesised. An engineered variant of PLD from Streptomyces antibioticus termed TNYR SaPLD was developed capable of synthesising 1-phosphatidylinositol with positional specificity of up to 98%. To gain a better understanding of the substrate binding features of the TNYR SaPLD, crystal structures have been determined for the free enzyme and its complexes with phosphate, phosphatidic acid and 1-inositol phosphate. Comparisons of these structures with the wild-type SaPLD show a larger binding site able to accommodate a bulkier secondary alcohol substrate as well as changes to the position of a flexible surface loop proposed to be involved in substrate recognition. The complex of the active TNYR SaPLD with 1-inositol phosphate reveals a covalent intermediate adduct with the ligand bound to H442 rather than to H168, the proposed nucleophile in the wild-type enzyme. This structural feature suggests that the enzyme exhibits plasticity of the catalytic mechanism different from what has been reported to date for PLDs. These structural studies provide insights into the underlying mechanism that governs the recognition of myo-inositol by TNYR SaPLD, and an important foundation for further studies of the catalytic mechanism.

DOI： 10.1042/BCJ20210117

Increasing cell-free gene expression yields from linear templates inEscherichia coliandVibrio natriegensextracts by using DNA-binding proteins 査読有り国際共著 Open Access

Zhu, B; Gan, R; Cabezas, MD; Kojima, T; Nicol, R; Jewett, MC; Nakano, H

BIOTECHNOLOGY AND BIOENGINEERING 117 巻 ( 12 ) 頁： 3849 - 3857 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Biotechnology and Bioengineering

In crude extract-based cell-free protein synthesis (CFPS), DNA templates are transcribed and translated into functional proteins. Although linear expression templates (LETs) are less laborious and expensive to generate, plasmid templates are often desired over polymerase chain reaction-generated LETs due to increased stability and protection against exonucleases present in the extract of the reaction. Here we demonstrate that addition of a double stranded DNA-binding protein to the CFPS reaction, termed single-chain Cro protein (scCro), achieves terminal protection of LETs. This CroP-LET (scCro-based protection of LET) method effectively increases superfolder green fluorescent protein (sfGFP) expression levels from LETs in Escherichia coli CFPS reactions by sixfold. Our yields are comparable to other strategies that provide chemical and enzymatic DNA stabilization in E. coli CFPS. Notably, we also report that the CroP-LET method successfully enhanced yields in CFPS platforms derived from nonmodel organisms. Our results show that CroP-LET increased sfGFP yields by 18-fold in the Vibrio natriegens CFPS platform. With the fast-expanding applications of CFPS platforms, this method provides a practical and generalizable solution to protect linear expression DNA templates.

DOI： 10.1002/bit.27538

Development of a dual monoclonal antibody sandwich enzyme-linked immunosorbent assay for the detection of swine influenza virus using rabbit monoclonal antibody by Ecobody technology 査読有り

Sila-on, D; Chertchinnapa, P; Shinkai, Y; Kojima, T; Nakano, H

JOURNAL OF BIOSCIENCE AND BIOENGINEERING 130 巻 ( 2 ) 頁： 217 - 225 2020年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Bioscience and Bioengineering

A dual monoclonal antibody sandwich enzyme-linked immunosorbent assay (mAb sandwich ELISA) has been developed using rabbit monoclonal antibodies generated by Ecobody technology, which includes the isolation of single B cells binding to a specific antigen, amplification of the heavy and light chains of these immunoglobulins, and expression of the fragment of antigen binding (Fab) by cell-free protein synthesis (CFPS). A rabbit was immunized with swine influenza virus (SIV) vaccine, from which single B cells binding to the antigen were isolated. Then, immunoglobulin mRNA was amplified from single cells by reverse transcription-polymerase chain reaction, followed by the attachment of a T7 promoter, appropriate tags, and a T7 terminator for the expression of the Fab portion by CFPS. By taking advantage of two different peptide tags fused to the same Fab, optimal combinations for coating Fab on assay plates and detecting Fab, both synthesized by CFPS, were investigated for mAb sandwich ELISA. Pairs of Fab detected 0.5 ng SIV in the assay. In summary, this result showed the applicability of Ecobody technology for a variety of immunodetection kits for high throughput analyses.

DOI： 10.1016/j.jbiosc.2020.03.003

A simple, real-time assay of horseradish peroxidase using biolayer interferometry Open Access

Kojima, T; Nakane, A; Zhu, B; Alfi, A; Nakano, H

BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY 83 巻 ( 10 ) 頁： 1822 - 1828 2019年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Bioscience, Biotechnology and Biochemistry

Horseradish peroxidase (HRP) isoenzyme C1a is one of the most widely used enzymes for various analytical methods in bioscience research and medical fields. In these fields, real-time monitoring of HRP activity is highly desirable because the utility of HRP as a reporter enzyme would be expanded. In this study, we developed a simple assay system enabling real-time monitoring of HRP activity by using biolayer interferometry (BLI). The HRP activity was quantitatively detected on a BLI sensor chip by tracing a binding response of tyramide, a substrate of HRP, onto an immobilized protein. This system could be applied to analyses related to oxidase activity, as well as to the functional analysis of recombinant HRP.

DOI： 10.1080/09168451.2019.1621156

Production of active manganese peroxidase in Escherichia coli by co-expression of chaperones and in vitro maturation by ATP-dependent chaperone release

Alfi, A; Zhu, B; Damnjanovic, J; Kojima, T; Iwasaki, Y; Nakano, H

JOURNAL OF BIOSCIENCE AND BIOENGINEERING 128 巻 ( 3 ) 頁： 290 - 295 2019年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Bioscience and Bioengineering

Manganese peroxidase (MnP) is a fungal heme-containing enzyme which oxidizes Mn2+ to Mn3+, a diffusible and strong non-specific oxidant capable of attacking bulky phenolic substrates. Therefore, MnP is indispensable in the polymer and paper industries. Previous attempts of MnP expression in Escherichia coli resulted in the formation of inclusion bodies which required in vitro refolding. Aiming to investigate the bacterial production of MnP, we have revealed an interesting mechanism underlying chaperone-assisted maturation of this enzyme to its active form. Since we previously found that in vitro expression of MnP in E. coli system depends on disulfide bond isomerase DsbC, we chose SHuffle T7 Express, an E. coli constitutively expressing DsbC, as the host for in vivo expression of MnP. Initially, only a low amount of the enzyme was present in the soluble fraction, with no detectable peroxidase activity. Co-expression of MnP with different chaperone revealed that DnaK, DnaJ, and GrpE contributed the most to the solubility improvement, however, remained in a complex with the MnP, preventing the enzyme to assume its active conformation. We resolved this by in vitro maturation, involving incubation of the MnP-chaperone complex with hemin, ATP, and ATP regeneration system. While ATP enables the chaperones to finish the refolding cycle and release the MnP in its correctly folded form, hemin supports the formation of the holo-enzyme with fully recovered peroxidase activity. We believe that the findings of this paper will serve as an important clue for establishing the bacterial production of fungal peroxidases in the future.

DOI： 10.1016/j.jbiosc.2019.02.011

Acyl chain that matters: introducing sn-2 acyl chain preference to a phospholipase D by protein engineering 査読有り

Comprehensive investigation of the gene expression system regulated by an Aspergillus oryzae transcription factor XlnR using integrated mining of gSELEX-Seq and microarray data 査読有り Open Access

Oka, H; Kojima, T; Ihara, K; Kobayashi, T; Nakano, H

BMC GENOMICS 20 巻 ( 1 ) 頁： 16 2019年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：BMC Genomics

Background: Transcription factors (TFs) specifically bind to DNA sequences and control the expression of target genes. AoXlnR is a key TF involved in the expression of xylanolytic and cellulolytic enzymes in the filamentous fungi, Aspergillus oryzae. Genomic SELEX-Seq (gSELEX-Seq) can reveal the in vitro binding sites of a TF in a genome. To date, the gene expression network controlled by AoXlnR in A. oryzae is not fully explored. In this study, the data from gSELEX-Seq analysis and data mining were applied toward a comprehensive investigation of the AoXlnR-regulated transcriptional network in A. oryzae. Results: Around 2000 promoters were selected as AoXlnR-binding DNAs using gSELEX-Seq, consequently identifying the genes downstream of them. On the other hand, 72 differentially expressed genes (DEGs) related to AoXlnR had been determined by microarray analysis. The intersecting set of genes, that were found using the gSELEX-Seq and the microarray analysis, had 51 genes. Further, the canonical AoXlnR-binding motifs, 5′-GGCT(A/G) A-3′, were successfully identified in gSELEX-Seq. The motif numbers in each promoter of the DEGs and differential expression levels were correlated by in silico analysis. The analysis showed that the presence of both 5′-GGCTAA-3′ and 5′-GGCTGA-3′ motif has significantly high correlation with the differential expression levels of the genes. Conclusions: Genes regulated directly by AoXlnR were identified by integrated mining of data obtained from gSELEX-Seq and microarray. The data mining of the promoters of differentially expressed genes revealed the close relation between the presence of the AoXlnR-binding motifs and the expression levels of the downstream genes. The knowledge obtained in this study can contribute greatly to the elucidation of AoXlnR-mediated cellulose and xylan metabolic network in A. oryzae. The pipeline, which is based on integrated mining of data consisting of both in vitro characterization of the DNA-binding sites and TF phenotype, can be a robust platform for comprehensive analysis of the gene expression network via the TFs.

DOI： 10.1186/s12864-018-5375-5

Damnjanovic, J; Nakano, H; Iwasaki, Y

PROTEIN ENGINEERING DESIGN & SELECTION 32 巻 ( 1 ) 頁： 1 - 11 2019年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Protein Engineering, Design and Selection

Phospholipase D (PLD) is an enzyme widely used for enzymatic synthesis of structured phospholipids (PLs) with modified head groups. These PLs are mainly used as food supplements and liposome ingredients. Still, there is a need for an enzyme that discriminates between PLs and lysoPLs, for specific detection of lysoPLs in various specimens and enzymatic synthesis of certain PLs from a mixed substrate. To meet this demand, we aimed at altering sn-2 acyl chain recognition of a PLD, leading to a variant enzyme preferably reacting on lysoPLs, by protein engineering. Based on the crystal structure of Streptomyces antibioticus PLD, W166 was targeted for saturation mutagenesis due to its strong interaction with the sn-2 acyl chain of the PL. Screening result pointed at W166R and W166K PLDs to selectively react on lysophosphatidylcholine (lysoPC), while not on PC. These variants showed a negative correlation between activity and sn-2 chain length of PL substrates. This behavior was not observed in the wild-type (WT)-PLD. Kinetic analysis revealed that the W166R and W166K variants have 7-10 times higher preference to lysoPC compared to the WT-PLD. Additionally, W166R PLD showed detectable activity toward glycero-3-phosphocholine, unlike the WT-PLD. Applicability of the lysoPC-preferring PLD was demonstrated by detection of lysoPC in the mixed PC/lysoPC sample and by the synthesis of cyclic phosphatidic acid. Structure model analyses supported the experimental findings and provided a basis for the structure model-based hypothesis on the observed behavior of the enzymes.

DOI： 10.1093/protein/gzz019

SKIK-zipbody-alkaline phosphatase, a novel antibody fusion protein expressed in Escherichia coli cytoplasm

Ritthisan, P; Ojima-Kato, T; Damnjanovic, J; Kojima, T; Nakano, H

JOURNAL OF BIOSCIENCE AND BIOENGINEERING 126 巻 ( 6 ) 頁： 705 - 709 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Bioscience and Bioengineering

Antibody-enzyme fusion proteins have been used for various immunological detection techniques, such as ELISA, Western blotting and so on. The use of genetically-fused antibody-enzyme complexes has advantages over conventional chemical conjugation methods, as they require no complex chemical reactions and allow for the strict control of the number of enzymes fused with antibodies, resulting in a more stable performance of the bifunctional protein. Here, we describe efficient cytoplasmic soluble expression of an antigen-binding fragment (Fab) fused with Escherichia coli alkaline phosphatase (AP), N-terminal Ser-Lys-Ile-Lys (SKIK) tag that can improve the synthesis of the tagged protein, as well as leucine zipper (LZ) to enhance the association of the light chain and the heavy chain of Fab. Our results demonstrated that the SKIK-Fab-LZ-AP fusion was well expressed in E. coli oxidative cytoplasm in soluble form having both antigen-binding and AP activity, and was purified to homogeneity by two step column chromatography, suggesting that the combination of the SKIK tag and AP fusion can greatly increase the productivity and solubility of the Fab-enzyme fusion in an E. coli cytoplasmic expression system.

DOI： 10.1016/j.jbiosc.2018.06.009

Spatial arrangement of proteins using scCro-tag: application for an in situ enzymatic microbead assay 査読有り

Kojima, T; Hata, J; Oka, H; Hayashi, K; Hitomi, K; Nakano, H

BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY 82 巻 ( 11 ) 頁： 1911 - 1921 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Bioscience, Biotechnology and Biochemistry

In natural systems, various metabolic reactions are often spatially organized to increase enzyme activity and specificity. Thus, by spatially arranging enzyme molecules in synthetic systems to imitate these natural systems, it is possible to promote a high rate of enzymatic turnover. In this present study, a normal and mutant form of the scCro DNA-binding protein were shown to bind orthogonally to specific recognition sequences under appropriate conditions. Furthermore, these DNA-binding tags were used to establish an enzyme assay system based on the spatial arrangement of transglutaminase and its substrate at the molecular level. Together, the results of the present study suggest that the scCro-tag may be a powerful tool to facilitate the synthetic spatial arrangement of proteins on a DNA ligand.

DOI： 10.1080/09168451.2018.1501265