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Cunha Bustamante-Filho I, Renato Menegassi S, Ribas Pereira G, Dias Salton G, Mosena Munari F, Roberto Schneider M, Costa Mattos R, Otávio Jardim Barcellos J, Pereira Laurino J, Obino Cirne-Lima E, Inês Mascarenhas Jobim M. Bovine seminal plasma osteopontin: Structural modelling, recombinant expression and its relationship with semen quality. Andrologia 2020; 53:e13905. [PMID: 33225455 DOI: 10.1111/and.13905] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 10/13/2020] [Accepted: 10/24/2020] [Indexed: 12/12/2022] Open
Abstract
Osteopontin (OPN) is a multifunctional phosphoprotein that has been linked to fertility in bulls. However, the exact mechanism by which OPN contributes to fertilisation is yet unknown. The biotechnological use of OPN in bovine reproduction is promising but some gaps remain unfilled. The present work aimed: (a) to verify whether the seminal plasma OPN is associated with seminal traits and a standard breeding soundness exam; (b) to predict OPN interactions with integrins, CD44 and glycosaminoglycans through molecular docking; and (c) to develop a protocol for recombinant expression of OPN from vesicular gland cDNA. Ejaculates from top ranked bulls had higher amounts of seminal plasma OPN in comparison with bulls classified as questionable (p < .01). The structural modelling and molecular docking predictions indicated that bovine OPN binds to heparin disaccharide, hyaluronic acid and hyaluronan. In addition, docking studies described the binding complexes of OPN with CD44 and the integrin heterodimers α5β1 and αVβ3. Finally, expression of rOPN-6His was successfully obtained after 3 hr of induction with 0.5 mM IPTG at 37°C and a denaturing purification protocol resulted in efficiently purified recombinant OPN. The present results contribute to the development of biotechnological uses of OPN as a biomarker in bovine reproduction.
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Affiliation(s)
- Ivan Cunha Bustamante-Filho
- Laboratório de Biotecnologia, Universidade do Vale do Taquari - UNIVATES, Lajeado, RS, Brazil.,Departamento de Ciência Animal, PPG Zootecnia - NESPRO, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.,Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil.,Gene Center, Ludwig-Maximilians Universität München, Munich, Bayern, Germany
| | - Silvio Renato Menegassi
- Departamento de Ciência Animal, PPG Zootecnia - NESPRO, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Gabriel Ribas Pereira
- Laboratório de Biotecnologia, Universidade do Vale do Taquari - UNIVATES, Lajeado, RS, Brazil
| | - Gabrielle Dias Salton
- Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Fernanda Mosena Munari
- Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | | | - Rodrigo Costa Mattos
- Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Júlio Otávio Jardim Barcellos
- Departamento de Ciência Animal, PPG Zootecnia - NESPRO, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Jomar Pereira Laurino
- Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Elizabeth Obino Cirne-Lima
- Centro de Pesquisa Experimental, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil.,Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
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2
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Zarafshan SS, Manjunath P. Novel affinity chromatography method for the efficient purification of recombinant Binder of SPerm homolog proteins. J Sep Sci 2020; 43:3458-3466. [PMID: 32619312 DOI: 10.1002/jssc.202000250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In mammalian species, a family of proteins named the Binder of SPerm proteins, which are expressed in the male reproductive tract, have been shown to play a role in epididymal sperm maturation and sperm capacitation. Recently, one homolog from human and two homologs from mouse were characterized. In order to further investigate the biochemical activity of these proteins, efficient purification procedures are required to isolate the proteins. Since these proteins are produced in very minute quantities, we exploited the high capacity of Escherichia coli to produce larger quantities of recombinant proteins that were subsequently purified using affinity chromatography on a diethylaminoethyl-Sephadex A-25 column. Binder of SPerm proteins have been shown to interact with pseudo-choline groups such as diethylaminoethyl through affinity rather than ionic interactions. The aim of the current study was to develop a novel method for purifying these recombinant proteins, produced in Escherichia coli cells. Diethylaminoethyl is positively charged and is a weak anion exchanger, but binder of sperm proteins interacts with affinity to this resin. This study presents a new, rapid, and cost-effective purification method that provides with an exceptional purity level, which can be used to study their roles in mammalian fertilization.
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Affiliation(s)
- Samin Sabouhi Zarafshan
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, Canada.,Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada
| | - Puttaswamy Manjunath
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, Canada.,Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada
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3
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Heidari-Vala H, Sabouhi-Zarafshan S, Prud'homme B, Alnoman A, Manjunath P. Role of Binder of SPerm homolog 1 (BSPH1) protein in mouse sperm-egg interaction and fertilization. Biochem Biophys Res Commun 2020; 527:358-364. [PMID: 32253033 DOI: 10.1016/j.bbrc.2020.03.127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 03/20/2020] [Indexed: 01/09/2023]
Abstract
In mice, the Binder of Sperm Homolog 1 protein is exclusively expressed in the epididymis. BSP proteins play a role in the membrane modification events that occur during sperm capacitation. In the current study, we investigated the role of mouse recombinant BSP homolog 1 (rec-BSPH1) in sperm-egg interaction. Mouse oocytes were co-incubated with different concentrations of rec-BSPH1 or control proteins and then inseminated with sperm. To establish whether rec-BSPH1 interfered with in vitro fertilization of mouse oocytes, rec-BSPH1 binding to egg and sperm was first tested using an immunodetection assay. In separate experiments, sperm were immuno-neutralized by anti-rec-BSPH1 antibodies to indirectly verify the implication of BSPH1 in sperm-egg interaction and fertilization. The study revealed a dose-dependent inhibition of fertilization when oocytes were pre-incubated with rec-BSPH1. Moreover, sperm immuno-neutralization with anti-rec-BSPH1 antibodies led to dramatic motility changes, followed by compromised fertilization. In view of these results, we conclude that BSPH1 could be a marker of sperm fertility and thus an eventual target for male contraceptive development.
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Affiliation(s)
- Hamed Heidari-Vala
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, H1T 2M4, Canada; Department of Pharmacology and Physiology, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada.
| | - Samin Sabouhi-Zarafshan
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, H1T 2M4, Canada; Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada
| | - Bruno Prud'homme
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, H1T 2M4, Canada
| | - Abdullah Alnoman
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, H1T 2M4, Canada; Department of Pharmacology and Physiology, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada
| | - Puttaswamy Manjunath
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Quebec, H1T 2M4, Canada; Department of Pharmacology and Physiology, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada; Department of Biochemistry and Molecular Medicine, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada; Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, Quebec, H3C 3J7, Canada.
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4
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Singh BP, Asthana A, Basu A, Tangirala R, Mohan Rao C, Swamy MJ. Conserved core tryptophans of FnII domains are crucial for the membranolytic and chaperone-like activities of bovine seminal plasma protein PDC-109. FEBS Lett 2019; 594:509-518. [PMID: 31552690 DOI: 10.1002/1873-3468.13617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/02/2019] [Accepted: 09/17/2019] [Indexed: 11/06/2022]
Abstract
The fibronectin type II (FnII) domain, present in diverse vertebrate proteins, plays crucial roles in several fundamental biological processes. PDC-109, the major bovine seminal plasma protein, contains two FnII domains that bind to choline phospholipids on sperm plasma membrane and induce lipid efflux crucial for successful fertilization. PDC-109 also exhibits chaperone-like activity and protects other proteins against various types of stress. Here, we show that a core tryptophan residue is highly conserved across species in the FnII domains. Mutation of conserved tryptophan residues W47, W93, and W106 in the FnII domains of PDC-109 to alanine leads to drastic decrease or complete abolition of membrane-binding and chaperone-like activities. These observations suggest that conserved tryptophans are important for the function of FnII proteins.
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Affiliation(s)
| | | | - Amrita Basu
- School of Chemistry, University of Hyderabad, India
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5
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Eskandari-Shahraki M, Prud'homme B, Manjunath P. CRISPR-Cas9-mediated mutation revealed BSPH2 protein is dispensable for male fertility. Mol Reprod Dev 2018; 85:709-719. [PMID: 29969530 DOI: 10.1002/mrd.23039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 06/26/2018] [Indexed: 12/11/2022]
Abstract
Members of the Binder of SPerm (BSP) superfamily have been identified in both human and mouse epididymis. These proteins are known to bind sperm membrane and promote sperm capacitation. Studies suggest that BSPH2 might play a different role in sperm functions from its counterparts; however, the role of BSPH2 remains mainly unexplored. To investigate whether the absence of one member of the BSP family could affect fertility, mice lacking Bsph2 expression were generated using clustered regularly interspaced short palindromic repeats (CRISPR) associated 9 (Cas9) technology. Knockout (KO) male mice were mated with wild-type (WT) females, and the number and weight of the pups were determined. Sperm motility in WT and KO was assessed using sperm class analyzer (SCA). Liquid chromatography tandem mass spectrometry (LC-MS/MS) was used for protein identification. Fertility analysis of null Bsph2 mice did not reveal any phenotype. No differences were noticed on average litter size or average pup weight. Normal testis weight and morphology were observed in Bsph2+/- and Bsph2-/- compared to the WT. Quantitative polymerase chain reaction analyses revealed that Bsph1 messenger RNA expression was increased in mutant mice, whereas LC-MS/MS analysis displayed no increase in protein expression level. Taken together, we show the existence of redundant function for murine BSPH2 and the lack of BSPH2 itself does not lead to sterility.
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Affiliation(s)
- Marzieh Eskandari-Shahraki
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Canada.,Departments of Pharmacology and Physiology, Faculty of Medicine, University of Montreal, Montreal, Canada
| | | | - Puttaswamy Manjunath
- Maisonneuve-Rosemont Hospital Research Centre, Montreal, Canada.,Departments of Pharmacology and Physiology, Faculty of Medicine, University of Montreal, Montreal, Canada.,Department of Medicine, Faculty of Medicine, University of Montreal, Montreal, Canada
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6
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Milk proteins interact with goat Binder of SPerm (BSP) proteins and decrease their binding to sperm. Cell Tissue Res 2016; 366:427-442. [PMID: 27432314 DOI: 10.1007/s00441-016-2438-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 05/31/2016] [Indexed: 12/20/2022]
Abstract
Seminal plasma Binder of SPerm (BSP) proteins bind to sperm at ejaculation and promote capacitation. When in excess, however, BSP proteins damage the sperm membrane. It has been suggested that milk components of semen extenders associate with BSP proteins, potentially protecting sperm. Thus, this study was conducted to investigate if milk proteins interact with BSP proteins and reduce BSP binding to goat sperm. Using gel filtration chromatography, milk was incubated with goat seminal plasma proteins and loaded onto columns with and without calcium. Milk was also fractionated into parts containing mostly whey proteins or mostly caseins, incubated with seminal plasma proteins and subjected to gel filtration. Eluted fractions were evaluated by immunoblot using anti-goat BSP antibodies, confirming milk protein-BSP protein interactions. As determined by ELISA, milk proteins coated on polystyrene wells bound to increasing of goat BSP proteins. Far-western dot blots confirmed that BSP proteins bound to caseins and β-lactoglobulin in a concentration-dependent manner. Then, cauda epididymal sperm from five goats was incubated with seminal plasma; seminal plasma followed by milk; and milk followed by seminal plasma. Sperm membrane proteins were extracted and evaluated by immunoblotting. The pattern of BSP binding to sperm membrane proteins was reduced by 59.3 % when epididymal sperm were incubated with seminal plasma and then with skimmed milk (p < 0.05). When epididymal sperm were treated with milk followed by seminal plasma, coating of sperm with BSP proteins was not significantly reduced (57.6 %; p > 0.05). In conclusion, goat BSP proteins have an affinity for caseins and whey proteins. Milk reduces BSP binding to goat sperm, depending whether or not sperm had been previously exposed to seminal plasma. Such events may explain the protective effect of milk during goat sperm preservation.
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7
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Evolution and function of mammalian binder of sperm proteins. Cell Tissue Res 2015; 363:105-127. [DOI: 10.1007/s00441-015-2289-2] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 08/26/2015] [Indexed: 01/28/2023]
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8
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Serrano E, Martínez AB, Arruga D, Pérez-Pé R, Sánchez-Ferrer Á, Muiño-Blanco T, Cebrián-Pérez JA. New Insights into the Phylogeny and Gene Context Analysis of Binder of Sperm Proteins (BSPs). PLoS One 2015; 10:e0137008. [PMID: 26333091 PMCID: PMC4557993 DOI: 10.1371/journal.pone.0137008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 08/11/2015] [Indexed: 12/20/2022] Open
Abstract
Seminal plasma (SP) proteins support the survival of spermatozoa acting not only at the plasma membrane but also by inhibition of capacitation, resulting in higher fertilizing ability. Among SP proteins, BSP (binder of sperm) proteins are the most studied, since they may be useful for the improvement of semen diluents, storage and subsequent fertilization results. However, an updated and detailed phylogenetic analysis of the BSP protein superfamily has not been carried out with all the sequences described in the main databases. The update view shows for the first time an equally distributed number of sequences between the three families: BSP, and their homologs 1 (BSPH1) and 2 (BSPH2). The BSP family is divided in four subfamilies, BSP1 subfamily being the predominant, followed by subfamilies BSP3, BSP5 and BSP2. BSPH proteins were found among placental mammals (Eutheria) belonging to the orders Proboscidea, Primates, Lagomorpha, Rodentia, Chiroptera, Perissodactyla and Cetartiodactyla. However, BSPH2 proteins were also found in the Scandentia order and Metatheria clade. This phylogenetic analysis, when combined with a gene context analysis, showed a completely new evolutionary scenario for the BSP superfamily of proteins with three defined different gene patterns, one for BSPs, one for BSPH1/BSPH2/ELSPBP1 and another one for BSPH1/BSPH2 without ELSPBP1. In addition, the study has permitted to define concise conserved blocks for each family (BSP, BSPH1 and BSPH2), which could be used for a more reliable assignment for the incoming sequences, for data curation of current databases, and for cloning new BSPs, as the one described in this paper, ram seminal vesicle 20 kDa protein (RSVP20, Ovis aries BSP5b).
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Affiliation(s)
- Edith Serrano
- Departamento de Bioquímica y Biología Molecular y Celular—Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, Spain
| | - Ana B. Martínez
- Department of Biochemistry and Molecular Biology-A, Faculty of Biology, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, Campus Espinardo, E-30100, Murcia, Spain
- Murcia Biomedical Research Institute (IMIB-Arrixaca), 30120, Murcia, Spain
| | - Diana Arruga
- Departamento de Bioquímica y Biología Molecular y Celular—Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, Spain
| | - Rosaura Pérez-Pé
- Departamento de Bioquímica y Biología Molecular y Celular—Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, Spain
| | - Álvaro Sánchez-Ferrer
- Department of Biochemistry and Molecular Biology-A, Faculty of Biology, Regional Campus of International Excellence “Campus Mare Nostrum”, University of Murcia, Campus Espinardo, E-30100, Murcia, Spain
- Murcia Biomedical Research Institute (IMIB-Arrixaca), 30120, Murcia, Spain
- * E-mail: (ASF); (JACP)
| | - Teresa Muiño-Blanco
- Departamento de Bioquímica y Biología Molecular y Celular—Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, Spain
| | - José A. Cebrián-Pérez
- Departamento de Bioquímica y Biología Molecular y Celular—Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), Facultad de Veterinaria, Universidad de Zaragoza, 50013, Zaragoza, Spain
- * E-mail: (ASF); (JACP)
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9
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Plante G, Manjunath P. Epididymal Binder of SPerm genes and proteins: what do we know a decade later? Andrology 2015; 3:817-24. [DOI: 10.1111/andr.12089] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 05/31/2015] [Accepted: 06/30/2015] [Indexed: 11/27/2022]
Affiliation(s)
- G. Plante
- Maisonneuve-Rosemont Hospital Research Centre; Montréal Québec Canada
- Department of Biochemistry; Faculty of Medicine; University of Montréal; Montréal Québec Canada
| | - P. Manjunath
- Maisonneuve-Rosemont Hospital Research Centre; Montréal Québec Canada
- Department of Biochemistry; Faculty of Medicine; University of Montréal; Montréal Québec Canada
- Department of Medicine; Faculty of Medicine; University of Montréal; Montréal Québec Canada
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10
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Allahyari M, Mohabati R, Babaie J, Amiri S, Siavashani ZJ, Zare M, Sadeghiani G, Golkar M. Production of in-vitro refolded and highly antigenic SAG1 for development of a sensitive and specific Toxoplasma IgG ELISA. J Immunol Methods 2014; 416:157-66. [PMID: 25437069 DOI: 10.1016/j.jim.2014.11.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 10/20/2014] [Accepted: 11/21/2014] [Indexed: 01/23/2023]
Abstract
Recombinant antigens are increasingly applied to replace native antigens in serological tests. Surface antigen 1 (SAG1) is a highly immunogenic antigen and probably represents the most explored and used antigen of Toxoplasma gondii for development of serological test kits. The presence of six disulfide bridges in its structure makes SAG1 a highly conformational protein. In fact, antigenicity of SAG1 is greatly dependent on proper disulfide bonding and folding. In-vitro refolding of SAG1 inclusion bodies, produced in Escherichia coli, was reported to result in soluble and antigenic protein. We produced SAG1 in E. coli and highly purified it by a single denaturing immobilized metal affinity chromatography. Refolding of denatured SAG1 was performed by (a) dialysis in the presence of reduced/oxidized glutathione, (b) drop-wise dilution and (c) drop-wise dilution in the presence of CuSo4. Refolding in the presence of oxido-shuffling reagent was much more efficient in producing presumably correctly-folded and highly antigenic SAG1 as demonstrated by non-reducing SDS-gel electrophoresis, ELISA, Western blotting and reversed-phase HPLC. An IgG ELISA developed using SAG1 refolded in the presence of oxido-shuffling reagent displayed high sensitivity and specificity for detection of Toxoplasma IgG antibodies in pregnant women.
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Affiliation(s)
- Mojgan Allahyari
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran; Recombinant Protein Production Department, Research and Production Complex, Pasteur Institute of Iran, Karaj, Iran
| | - Reyhaneh Mohabati
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Jalal Babaie
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Samira Amiri
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Zahra Jafari Siavashani
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Mehrak Zare
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Ghazaleh Sadeghiani
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Majid Golkar
- Molecular Parasitology Laboratory, Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran.
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11
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Do BH, Ryu HB, Hoang P, Koo BK, Choe H. Soluble prokaryotic overexpression and purification of bioactive human granulocyte colony-stimulating factor by maltose binding protein and protein disulfide isomerase. PLoS One 2014; 9:e89906. [PMID: 24594699 PMCID: PMC3940694 DOI: 10.1371/journal.pone.0089906] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 01/24/2014] [Indexed: 01/17/2023] Open
Abstract
Human granulocyte colony-stimulating factor (hGCSF), a neutrophil-promoting cytokine, is an effective therapeutic agent for neutropenia patients who have undergone several cancer treatments. Efficient production of hGCSF using E. coli is challenging because the hormone tends to aggregate and forms inclusion bodies. This study examined the ability of seven different N-terminal fusion tags to increase expression of soluble hGCSF in E. coli. Four tag proteins, namely maltose-binding protein (MBP), N-utilization substance protein A, protein disulfide isomerase (PDI), and the b'a' domain of PDI (PDIb'a'), increased the solubility of hGCSF under normal conditions. Lowering the expression temperature from 30°C to 18°C also increased the solubility of thioredoxin-tagged and glutathione S-transferase-tagged hGCSF. By contrast, hexahistidine-tagged hGCSF was insoluble at both temperatures. Simple conventional chromatographic methods were used to purify hGCSF from the overexpressed PDIb'a'-hGCSF and MBP-hGCSF proteins. In total, 11.3 mg or 10.2 mg of pure hGCSF were obtained from 500 mL cultures of E. coli expressing PDIb'a'-hGCSF or MBP-hGCSF, respectively. SDS-PAGE analysis and silver staining confirmed high purity of the isolated hGCSF proteins, and the endotoxin levels were less than 0.05 EU/µg of protein. Subsequently, the bioactivity of the purified hGCSF proteins similar to that of the commercially available hGCSF was confirmed using the mouse M-NFS-60 myelogenous leukemia cell line. The EC50s of the cell proliferation dose-response curves for hGCSF proteins purified from MBP-hGCSF and PDIb'a'-hGCSF were 2.83±0.31 pM, and 3.38±0.41 pM, respectively. In summary, this study describes an efficient method for the soluble overexpression and purification of bioactive hGCSF in E. coli.
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Affiliation(s)
- Bich Hang Do
- Department of Physiology and Biomedical Institute of Technology, University of Ulsan College of Medicine, Seoul, Korea
| | - Han-Bong Ryu
- Department of Physiology and Biomedical Institute of Technology, University of Ulsan College of Medicine, Seoul, Korea
| | - Phuong Hoang
- Department of Physiology and Biomedical Institute of Technology, University of Ulsan College of Medicine, Seoul, Korea
| | - Bon-Kyung Koo
- Department of Physiology and Biomedical Institute of Technology, University of Ulsan College of Medicine, Seoul, Korea
| | - Han Choe
- Department of Physiology and Biomedical Institute of Technology, University of Ulsan College of Medicine, Seoul, Korea
- * E-mail:
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12
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Plante G, Therien I, Lachance C, Leclerc P, Fan J, Manjunath P. Implication of the human Binder of SPerm Homolog 1 (BSPH1) protein in capacitation. Mol Hum Reprod 2014; 20:409-21. [DOI: 10.1093/molehr/gau006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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13
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Duong-Ly KC, Gabelli SB. Explanatory chapter: troubleshooting recombinant protein expression: general. Methods Enzymol 2014; 541:209-29. [PMID: 24674074 DOI: 10.1016/b978-0-12-420119-4.00017-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
One of the most daunting problems for biochemists is the expression of recombinant proteins. Often, the host organism differs from the organism from which the gene coding for the protein of interest was derived. This article provides guidelines to determine whether or not protein expression is a problem, describes possible reasons for low protein expression, and covers several possible solutions. A protocol for measuring protein expression during E. coli cell growth and after induction is given. The reader should note that low protein expression is a complex problem that often stems from a variety of factors. Combinations of the solutions presented in this article may be required to solve a problem of protein expression. A brief overview of host cell expression systems is given, but the article primarily focuses on expression in E. coli as this is the most commonly used host organism. Some of the methods discussed here, however, may be applied to other expression systems.
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Affiliation(s)
- Krisna C Duong-Ly
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sandra B Gabelli
- Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
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14
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Ashrafzadeh A, Karsani SA, Nathan S. Mammalian sperm fertility related proteins. Int J Med Sci 2013; 10:1649-57. [PMID: 24151436 PMCID: PMC3804790 DOI: 10.7150/ijms.6395] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 07/23/2013] [Indexed: 02/03/2023] Open
Abstract
Infertility is an important aspect of human and animal reproduction and still presents with much etiological ambiguity. As fifty percent of infertility is related to the male partner, molecular investigations on sperm and seminal plasma can lead to new knowledge on male infertility. Several comparisons between fertile and infertile human and other species sperm proteome have shown the existence of potential fertility markers. These proteins have been categorized into energy related, structural and other functional proteins which play a major role in sperm motility, capacitation and sperm-oocyte binding. The data from these studies show the impact of sperm proteome studies on identifying different valuable markers for fertility screening. In this article, we review recent development in unraveling sperm fertility related proteins.
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Affiliation(s)
- Ali Ashrafzadeh
- 1. School of Biosciences and Biotechnology, Faculty of Science and Technology, University Kebangsaan Malaysia, Selangor, Malaysia
| | - Saiful Anuar Karsani
- 2. Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
| | - Sheila Nathan
- 1. School of Biosciences and Biotechnology, Faculty of Science and Technology, University Kebangsaan Malaysia, Selangor, Malaysia
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15
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Ardon F, Suarez SS. Cryopreservation increases coating of bull sperm by seminal plasma binder of sperm proteins BSP1, BSP3, and BSP5. Reproduction 2013; 146:111-7. [DOI: 10.1530/rep-12-0468] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Artificial insemination with frozen semen allows affordable, worldwide dissemination of gametes with superior genetics. Nevertheless, sperm are damaged by the cryopreservation process. Elucidating the molecular effects of cryopreservation on sperm could suggest methods for improving fertility of frozen/thawed semen. This study was undertaken to examine the effect of cryopreservation on the coating of sperm by binder of sperm (BSP) proteins in seminal plasma. BSP proteins are secreted by the seminal vesicles and coat the surface of sperm by partially intercalating into the outer leaflet of the sperm plasma membrane. The BSP proteins are known to play roles in the formation of the oviductal sperm storage reservoir and in sperm capacitation. We investigated the effects of cryopreservation on the sperm BSP protein coat using Bovipure to separate live sperm from extended semen and then assaying the amounts of BSP proteins on sperm using quantitative western blotting with custom-made antibodies against unique sequences of each BSP protein. Greater amounts of all three BSP proteins (BSP1, BSP3, and BSP5) were detected on frozen/thawed sperm than on fresh sperm. Furthermore, the reduction of BSP3 from 15 to 13 kDa in mass, which occurs during incubation of sperm under mild capacitating conditions, was enhanced by cryopreservation. We concluded that freezing alters the BSP protein coating on sperm, which could account in part for reduced fertility of cryopreserved semen samples.
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16
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Sullivan R, Saez F. Epididymosomes, prostasomes, and liposomes: their roles in mammalian male reproductive physiology. Reproduction 2013; 146:R21-35. [PMID: 23613619 DOI: 10.1530/rep-13-0058] [Citation(s) in RCA: 209] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Mammalian spermatozoa are unique cells in many ways, and the acquisition of their main function, i.e. fertilization capacity, is a multistep process starting in the male gonad and ending near the female egg for the few cells reaching this point. Owing to the unique character of this cell, the molecular pathways necessary to achieve its maturation also show some specific characteristics. One of the most striking specificities of the spermatozoon is that its DNA is highly compacted after the replacement of histones by protamines, making the classical processes of transcription and translation impossible. The sperm cells are thus totally dependent on their extracellular environment for their protection against oxidative stress, for example, or for the molecular changes occurring during the transit of the epididymis; the first organ in which post-testicular maturation takes place. The molecular mechanisms underlying sperm maturation are still largely unknown, but it has been shown in the past three decades that extracellular vesicles secreted by the male reproductive tract are involved in this process. This review will examine the roles played by two types of naturally occurring extracellular vesicles, epididymosomes and prostasomes, secreted by the epididymis and the prostate respectively. We will also describe how the use of artificial vesicles, liposomes, contributed to the study of male reproductive physiology.
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Affiliation(s)
- Robert Sullivan
- Department of Obstetrics, Gynecology and Reproduction, Université Laval and Reproduction, Mother and Youth Health Research Axes, Research Center, Centre Hospitalier Universitaire de Québec, Pavillon CHUL, 2705 Boul Laurier, Québec, Canada, G1V 4G2.
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17
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Serrano E, Pérez-Pé R, Calleja L, Guillén N, Casao A, Hurtado-Guerrero R, Muiño-Blanco T, Cebrián-Pérez JA. Characterization of the cDNA and in vitro expression of the ram seminal plasma protein RSVP14. Gene 2013; 519:271-8. [DOI: 10.1016/j.gene.2013.02.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 01/22/2013] [Accepted: 02/07/2013] [Indexed: 12/29/2022]
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18
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Nozach H, Fruchart-Gaillard C, Fenaille F, Beau F, Ramos OHP, Douzi B, Saez NJ, Moutiez M, Servent D, Gondry M, Thaï R, Cuniasse P, Vincentelli R, Dive V. High throughput screening identifies disulfide isomerase DsbC as a very efficient partner for recombinant expression of small disulfide-rich proteins in E. coli. Microb Cell Fact 2013; 12:37. [PMID: 23607455 PMCID: PMC3668227 DOI: 10.1186/1475-2859-12-37] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 03/28/2013] [Indexed: 12/13/2022] Open
Abstract
Background Disulfide-rich proteins or DRPs are versatile bioactive compounds that encompass a wide variety of pharmacological, therapeutic, and/or biotechnological applications. Still, the production of DRPs in sufficient quantities is a major bottleneck for their complete structural or functional characterization. Recombinant expression of such small proteins containing multiple disulfide bonds in the bacteria E. coli is considered difficult and general methods and protocols, particularly on a high throughput scale, are limited. Results Here we report a high throughput screening approach that allowed the systematic investigation of the solubilizing and folding influence of twelve cytoplasmic partners on 28 DRPs in the strains BL21 (DE3) pLysS, Origami B (DE3) pLysS and SHuffle® T7 Express lysY (1008 conditions). The screening identified the conditions leading to the successful soluble expression of the 28 DRPs selected for the study. Amongst 336 conditions tested per bacterial strain, soluble expression was detected in 196 conditions using the strain BL21 (DE3) pLysS, whereas only 44 and 50 conditions for soluble expression were identified for the strains Origami B (DE3) pLysS and SHuffle® T7 Express lysY respectively. To assess the redox states of the DRPs, the solubility screen was coupled with mass spectrometry (MS) to determine the exact masses of the produced DRPs or fusion proteins. To validate the results obtained at analytical scale, several examples of proteins expressed and purified to a larger scale are presented along with their MS and functional characterization. Conclusions Our results show that the production of soluble and functional DRPs with cytoplasmic partners is possible in E. coli. In spite of its reducing cytoplasm, BL21 (DE3) pLysS is more efficient than the Origami B (DE3) pLysS and SHuffle® T7 Express lysY trxB-/gor- strains for the production of DRPs in fusion with solubilizing partners. However, our data suggest that oxidation of the proteins occurs ex vivo. Our protocols allow the production of a large diversity of DRPs using DsbC as a fusion partner, leading to pure active DRPs at milligram scale in many cases. These results open up new possibilities for the study and development of DRPs with therapeutic or biotechnological interest whose production was previously a limitation.
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Affiliation(s)
- Hervé Nozach
- CEA, iBiTec-S, Service d'Ingénierie Moléculaire des Protéines, CEA Saclay, Gif sur Yvette F-91191, France.
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Batruch I, Smith CR, Mullen BJ, Grober E, Lo KC, Diamandis EP, Jarvi KA. Analysis of Seminal Plasma from Patients with Non-obstructive Azoospermia and Identification of Candidate Biomarkers of Male Infertility. J Proteome Res 2012; 11:1503-11. [DOI: 10.1021/pr200812p] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ihor Batruch
- Samuel Lunenfeld Research Institute,
Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Christopher R. Smith
- Samuel Lunenfeld Research Institute,
Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Brendan J. Mullen
- Samuel Lunenfeld Research Institute,
Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Surgery (Division
of Urology), Mount Sinai Hospital, Toronto,
Ontario, Canada
| | - Ethan Grober
- Department of Surgery (Division
of Urology), Mount Sinai Hospital, Toronto,
Ontario, Canada
| | - Kirk C. Lo
- Department of Surgery (Division
of Urology), Mount Sinai Hospital, Toronto,
Ontario, Canada
| | - Eleftherios P. Diamandis
- Samuel Lunenfeld Research Institute,
Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Surgery (Division
of Urology), Mount Sinai Hospital, Toronto,
Ontario, Canada
- Department
of Clinical Biochemistry, University Health Network, Toronto, Ontario, Canada
- Department of Laboratory Medicine
and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Keith A. Jarvi
- Samuel Lunenfeld Research Institute,
Department of Pathology and Laboratory Medicine, Mount Sinai Hospital, Toronto, Ontario, Canada
- Department of Surgery (Division
of Urology), Mount Sinai Hospital, Toronto,
Ontario, Canada
- Department of Surgery, University of Toronto, Toronto, Ontario, Canada
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Batruch I, Lecker I, Kagedan D, Smith CR, Mullen BJ, Grober E, Lo KC, Diamandis EP, Jarvi KA. Proteomic Analysis of Seminal Plasma from Normal Volunteers and Post-Vasectomy Patients Identifies over 2000 Proteins and Candidate Biomarkers of the Urogenital System. J Proteome Res 2011; 10:941-53. [DOI: 10.1021/pr100745u] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Ihor Batruch
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Irene Lecker
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Daniel Kagedan
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Christopher R. Smith
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Brendan J. Mullen
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Ethan Grober
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Kirk C. Lo
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Eleftherios P. Diamandis
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
| | - Keith A. Jarvi
- Samuel Lunenfeld Research Institute, Department of Pathology and Laboratory Medicine and ‡Department of Surgery (Division of Urology), Mount Sinai Hospital, Toronto, ON, Canada M5T 3L9
- Department of Clinical Biochemistry, University Health Network, ∥Department of Laboratory Medicine and Pathobiology, and ⊥Department of Surgery, University of Toronto, Toronto, ON, Canada M5G 1L5
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21
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Scolari S, Müller K, Bittman R, Herrmann A, Müller P. Interaction of Mammalian Seminal Plasma Protein PDC-109 with Cholesterol: Implications for a Putative CRAC Domain. Biochemistry 2010; 49:9027-31. [DOI: 10.1021/bi101257c] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Silvia Scolari
- Department of Biology, Humboldt University Berlin, Invalidenstrasse 42, 10115 Berlin, Germany
| | - Karin Müller
- Leibniz Institute for Zoo and Wildlife Research, Berlin, Germany
| | - Robert Bittman
- Department of Chemistry and Biochemistry, Queens College of the City University of New York, Flushing, New York 11367-1597, United States
| | - Andreas Herrmann
- Department of Biology, Humboldt University Berlin, Invalidenstrasse 42, 10115 Berlin, Germany
| | - Peter Müller
- Department of Biology, Humboldt University Berlin, Invalidenstrasse 42, 10115 Berlin, Germany
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22
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Francis DM, Page R. Strategies to optimize protein expression in E. coli. CURRENT PROTOCOLS IN PROTEIN SCIENCE 2010; Chapter 5:5.24.1-5.24.29. [PMID: 20814932 PMCID: PMC7162232 DOI: 10.1002/0471140864.ps0524s61] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Recombinant protein expression in Escherichia coli (E. coli) is simple, fast, inexpensive, and robust, with the expressed protein comprising up to 50 percent of the total cellular protein. However, it also has disadvantages. For example, the rapidity of bacterial protein expression often results in unfolded/misfolded proteins, especially for heterologous proteins that require longer times and/or molecular chaperones to fold correctly. In addition, the highly reductive environment of the bacterial cytosol and the inability of E. coli to perform several eukaryotic post-translational modifications results in the insoluble expression of proteins that require these modifications for folding and activity. Fortunately, multiple, novel reagents and techniques have been developed that allow for the efficient, soluble production of a diverse range of heterologous proteins in E. coli. This overview describes variables at each stage of a protein expression experiment that can influence solubility and offers a summary of strategies used to optimize soluble expression in E. coli.
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23
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de Marco A. Strategies for successful recombinant expression of disulfide bond-dependent proteins in Escherichia coli. Microb Cell Fact 2009; 8:26. [PMID: 19442264 PMCID: PMC2689190 DOI: 10.1186/1475-2859-8-26] [Citation(s) in RCA: 257] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2009] [Accepted: 05/14/2009] [Indexed: 12/22/2022] Open
Abstract
Bacteria are simple and cost effective hosts for producing recombinant proteins. However, their physiological features may limit their use for obtaining in native form proteins of some specific structural classes, such as for instance polypeptides that undergo extensive post-translational modifications. To some extent, also the production of proteins that depending on disulfide bridges for their stability has been considered difficult in E. coli. Both eukaryotic and prokaryotic organisms keep their cytoplasm reduced and, consequently, disulfide bond formation is impaired in this subcellular compartment. Disulfide bridges can stabilize protein structure and are often present in high abundance in secreted proteins. In eukaryotic cells such bonds are formed in the oxidizing environment of endoplasmic reticulum during the export process. Bacteria do not possess a similar specialized subcellular compartment, but they have both export systems and enzymatic activities aimed at the formation and at the quality control of disulfide bonds in the oxidizing periplasm. This article reviews the available strategies for exploiting the physiological mechanisms of bactera to produce properly folded disulfide-bonded proteins.
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Affiliation(s)
- Ario de Marco
- Cogentech, IFOM-IEO Campus for Oncogenomic, via Adamello, 16 - 20139, Milano, Italy.
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