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Morejón García G, García de la Rosa I, Feal Carballo S, Castells Martínez EM, Stable Vernier IC, Quintana Guerra JM, Hernández Pérez L, Lafita Delfino Y, Pérez Morás PL, Pupo Infante M, Figueredo Lago JE, González Reyes EC. Generation and characterization of murine monoclonal antibodies against immunoreactive trypsinogen for newborn screening of cystic fibrosis. Anal Biochem 2019; 591:113569. [PMID: 31887264 DOI: 10.1016/j.ab.2019.113569] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 12/17/2019] [Accepted: 12/25/2019] [Indexed: 02/01/2023]
Abstract
Cystic fibrosis (CF) is a multisystem disorder that reduces quality of life and survival in affected individuals. In newborns, the release of pancreatic enzymes into the blood raises the levels of immunoreactive trypsinogen (IRT), the main marker for CF screening, which is detected in dried blood samples on filter paper by immunoenzymatic assays. In Cuba, CF has an estimated incidence of 1/9862 live births and should be included in the national basic newborn screening (NBS) panel given its benefits in terms of nutrition, lung function and survival. The Immunoassay Center develops and produces diagnostic kits allowing the establishment of large-scale NBS programs for inherited metabolic disorders in Cuba and other Latin American countries. IRT-specific monoclonal antibodies (MAbs) obtained at the Immunoassay Center are essential for developing an affordable immunoassay for IRT to support CF NBS in our low-income country. An immunization scheme with trypsinogen-1 originated two IgG1-producing murine hybridomas. 4C9C9 and 4C9E11 MAbs recognized different determinants on both trypsin-1 and trypsin-2 molecules. Both antibodies identified conformational epitopes on the molecule of trypsin-1 and of its zymogen. As 4C9E11 MAb cross-reacted with proteins structurally and functionally related to trypsinogen, it was used as revealing antibody in a sandwich-type UMELISA® assay for IRT determination with 4C9C9 MAb for capture. This combination, aside from detecting several commercially available trypsins, adequately quantified IRT from dried blood samples on filter paper of newborns. The evaluation of the assay's accuracy yielded percentage recoveries ranging 93.3-109.2% for commercial controls. The properties of the studied MAbs demonstrate their suitability for being used in a sandwich-type UMELISA® assay for the CF NBS in Cuba.
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Affiliation(s)
- Greilys Morejón García
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | - Iria García de la Rosa
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | - Sadys Feal Carballo
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | | | - Imara C Stable Vernier
- Center for Genetic Engineering and Biotechnology (CIGB), 31st Avenue Between 158 and 190 Streets, Zip Code 10600, Cubanacán, Playa, Havana, Cuba.
| | - Joel M Quintana Guerra
- Center for Genetic Engineering and Biotechnology (CIGB), 31st Avenue Between 158 and 190 Streets, Zip Code 10600, Cubanacán, Playa, Havana, Cuba.
| | - Liliana Hernández Pérez
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | - Yesdiley Lafita Delfino
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | - Pedro L Pérez Morás
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | - Maylín Pupo Infante
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
| | - Juan E Figueredo Lago
- Immunoassay Center, 134 Street and 25th Avenue, Zip Code 11600, Cubanacán, Playa, Havana, Cuba.
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Recombinant Inga Laurina Trypsin Inhibitor (ILTI) Production in Komagataella Phaffii Confirms Its Potential Anti-Biofilm Effect and Reveals an Anti-Tumoral Activity. Microorganisms 2018; 6:microorganisms6020037. [PMID: 29710773 PMCID: PMC6027459 DOI: 10.3390/microorganisms6020037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 04/23/2018] [Accepted: 04/24/2018] [Indexed: 12/12/2022] Open
Abstract
Protease inhibitors have a broad biotechnological application ranging from medical drugs to anti-microbial agents. The Inga laurina trypsin inhibitor (ILTI) previously showed a great in vitro inhibitory effect under the adherence of Staphylococcus species, being a strong candidate for use as an anti-biofilm agent. Nevertheless, this is found in small quantities in its sources, which impairs its utilization at an industrial scale. Within this context, heterologous production using recombinant microorganisms is one of the best options to scale up the recombinant protein production. Thus, this work aimed at utilizing Komagataella phaffii to produce recombinant ILTI. For this, the vector pPIC9K+ILTI was constructed and inserted into the genome of the yeast K. phaffii, strain GS115. The protein expression was highest after 48 h using methanol 1%. A matrix-assisted laser desorption ionization⁻time-of-flight (MALDI⁻TOF) analysis was performed to confirm the production of the recombinant ILTI and its activity was investigated trough inhibitory assays using the synthetic substrate Nα-Benzoyl-D,L-arginine p-nitroanilide hydrochloride (BAPNA). Finally, recombinant ILTI (rILTI) was used in assays, showing that there was no significant difference between native and recombinant ILTI in its inhibitory activity in biofilm formation. Anti-tumor assay against Ehrlich ascites tumor (EAT) cells showed that rILTI has a potential anti-tumoral effect, showing the same effect as Melittin when incubated for 48 h in concentrations above 25 µg/mL. All together the results suggests broad applications for rILTI.
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Smith D, Tikhonova IG, Jewhurst HL, Drysdale OC, Dvořák J, Robinson MW, Cwiklinski K, Dalton JP. Unexpected Activity of a Novel Kunitz-type Inhibitor: INHIBITION OF CYSTEINE PROTEASES BUT NOT SERINE PROTEASES. J Biol Chem 2016; 291:19220-34. [PMID: 27422822 PMCID: PMC5016662 DOI: 10.1074/jbc.m116.724344] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Indexed: 12/15/2022] Open
Abstract
Kunitz-type (KT) protease inhibitors are low molecular weight proteins classically defined as serine protease inhibitors. We identified a novel secreted KT inhibitor associated with the gut and parenchymal tissues of the infective juvenile stage of Fasciola hepatica, a helminth parasite of medical and veterinary importance. Unexpectedly, recombinant KT inhibitor (rFhKT1) exhibited no inhibitory activity toward serine proteases but was a potent inhibitor of the major secreted cathepsin L cysteine proteases of F. hepatica, FhCL1 and FhCL2, and of human cathepsins L and K (Ki = 0.4-27 nm). FhKT1 prevented the auto-catalytic activation of FhCL1 and FhCL2 and formed stable complexes with the mature enzymes. Pulldown experiments from adult parasite culture medium showed that rFhKT1 interacts specifically with native secreted FhCL1, FhCL2, and FhCL5. Substitution of the unusual P1 Leu15 within the exposed reactive loop of FhKT1 for the more commonly found Arg (FhKT1Leu15/Arg15) had modest adverse effects on the cysteine protease inhibition but conferred potent activity against the serine protease trypsin (Ki = 1.5 nm). Computational docking and sequence analysis provided hypotheses for the exclusive binding of FhKT1 to cysteine proteases, the importance of the Leu15 in anchoring the inhibitor into the S2 active site pocket, and the inhibitor's selectivity toward FhCL1, FhCL2, and human cathepsins L and K. FhKT1 represents a novel evolutionary adaptation of KT protease inhibitors by F. hepatica, with its prime purpose likely in the regulation of the major parasite-secreted proteases and/or cathepsin L-like proteases of its host.
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Affiliation(s)
| | - Irina G Tikhonova
- School of Pharmacy, Medical Biology Centre, Queen's University Belfast, Belfast BT9 7BL, Northern Ireland, United Kingdom
| | | | | | - Jan Dvořák
- From the School of Biological Sciences and
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Cabrera-Muñoz A, Rojas L, Gil DF, González-González Y, Mansur M, Camejo A, Pires JR, Alonso-Del-Rivero Antigua M. Heterologous expression of Cenchritis muricatus protease inhibitor II (CmPI-II) in Pichia pastoris system: Purification, isotopic labeling and preliminary characterization. Protein Expr Purif 2016; 126:127-136. [PMID: 27353494 DOI: 10.1016/j.pep.2016.06.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 06/23/2016] [Accepted: 06/24/2016] [Indexed: 10/21/2022]
Abstract
Cenchritis muricatus protease inhibitor II (CmPI-II) is a tight-binding serine protease inhibitor of the Kazal family with an atypical broad specificity, being active against several proteases such as bovine pancreatic trypsin, human neutrophil elastase and subtilisin A. CmPI-II 3D structures are necessary for understanding the molecular basis of its activity. In the present work, we describe an efficient and straightforward recombinant expression strategy, as well as a cost-effective procedure for isotope labeling for NMR structure determination purposes. The vector pCM101 containing the CmPI-II gene, under the control of Pichia pastoris AOX1 promoter was constructed. Methylotrophic Pichia pastoris strain KM71H was then transformed with the plasmid and the recombinant protein (rCmPI-II) was expressed in benchtop fermenter in unlabeled or (15)N-labeled forms using ammonium chloride ((15)N, 99%) as the sole nitrogen source. Protein purification was accomplished by sequential cation exchange chromatography in STREAMLINE DirectHST, anion exchange chromatography on Hitrap Q-Sepharose FF and gel filtration on Superdex 75 10/30, yielding high quantities of pure rCmPI-II and (15)N rCmPI-II. Recombinant proteins displayed similar functional features as compared to the natural inhibitor and NMR spectra indicated folded and homogeneously labeled samples, suitable for further studies of structure and protease-inhibitor interactions.
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Affiliation(s)
- Aymara Cabrera-Muñoz
- Centro de Estudios de Proteínas, Facultad de Biología, Universidad de La Habana, Ciudad de La Habana-Cuba, Calle 25 No 455, Vedado, La Habana, Cuba.
| | - Laritza Rojas
- Centro de Estudios de Proteínas, Facultad de Biología, Universidad de La Habana, Ciudad de La Habana-Cuba, Calle 25 No 455, Vedado, La Habana, Cuba.
| | - Dayrom F Gil
- Centro de Estudios de Proteínas, Facultad de Biología, Universidad de La Habana, Ciudad de La Habana-Cuba, Calle 25 No 455, Vedado, La Habana, Cuba.
| | - Yamile González-González
- Centro de Estudios de Proteínas, Facultad de Biología, Universidad de La Habana, Ciudad de La Habana-Cuba, Calle 25 No 455, Vedado, La Habana, Cuba.
| | - Manuel Mansur
- Institut de Biotecnología i de Biomedicina, Universitat Autònoma de Barcelona, Campus Universitari, 08193, Bellaterra, Cerdanyola del Vallès, Barcelona, Spain.
| | - Ayamey Camejo
- Centro de Estudios de Proteínas, Facultad de Biología, Universidad de La Habana, Ciudad de La Habana-Cuba, Calle 25 No 455, Vedado, La Habana, Cuba.
| | - José R Pires
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Av. Carlos Chagas Filho, 373 - Bloco E, Sala 10, 21941-902, Rio de Janeiro, RJ, Brazil.
| | - Maday Alonso-Del-Rivero Antigua
- Centro de Estudios de Proteínas, Facultad de Biología, Universidad de La Habana, Ciudad de La Habana-Cuba, Calle 25 No 455, Vedado, La Habana, Cuba.
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The Kunitz-Type Protein ShPI-1 Inhibits Serine Proteases and Voltage-Gated Potassium Channels. Toxins (Basel) 2016; 8:110. [PMID: 27089366 PMCID: PMC4848636 DOI: 10.3390/toxins8040110] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 04/04/2016] [Accepted: 04/05/2016] [Indexed: 01/08/2023] Open
Abstract
The bovine pancreatic trypsin inhibitor (BPTI)-Kunitz-type protein ShPI-1 (UniProt: P31713) is the major protease inhibitor from the sea anemone Stichodactyla helianthus. This molecule is used in biotechnology and has biomedical potential related to its anti-parasitic effect. A pseudo wild-type variant, rShPI-1A, with additional residues at the N- and C-terminal, has a similar three-dimensional structure and comparable trypsin inhibition strength. Further insights into the structure-function relationship of rShPI-1A are required in order to obtain a better understanding of the mechanism of action of this sea anemone peptide. Using enzyme kinetics, we now investigated its activity against other serine proteases. Considering previous reports of bifunctional Kunitz-type proteins from anemones, we also studied the effect of rShPI-1A on voltage-gated potassium (Kv) channels. rShPI-1A binds Kv1.1, Kv1.2, and Kv1.6 channels with IC50 values in the nM range. Hence, ShPI-1 is the first member of the sea anemone type 2 potassium channel toxins family with tight-binding potency against several proteases and different Kv1 channels. In depth sequence analysis and structural comparison of ShPI-1 with similar protease inhibitors and Kv channel toxins showed apparent non-sequence conservation for known key residues. However, we detected two subtle patterns of coordinated amino acid substitutions flanking the conserved cysteine residues at the N- and C-terminal ends.
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García-Fernández R, Ziegelmüller P, González L, Mansur M, Machado Y, Redecke L, Hahn U, Betzel C, Chávez MDLÁ. Two variants of the major serine protease inhibitor from the sea anemone Stichodactyla helianthus, expressed in Pichia pastoris. Protein Expr Purif 2016; 123:42-50. [PMID: 26993255 DOI: 10.1016/j.pep.2016.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Revised: 02/26/2016] [Accepted: 03/11/2016] [Indexed: 12/13/2022]
Abstract
The major protease inhibitor from the sea anemone Stichodactyla helianthus (ShPI-1) is a non-specific inhibitor that binds trypsin and other trypsin-like enzymes, as well as chymotrypsin, and human neutrophil elastase. We performed site-directed mutagenesis of ShPI-1 to produce two variants (rShPI-1/K13L and rShPI/Y15S) that were expressed in Pichia pastoris, purified, and characterized. After a single purification step, 65 mg and 15 mg of protein per liter of culture supernatant were obtained for rShPI-1/K13L and rShPI/Y15S, respectively. Functional studies demonstrated a 100-fold decreased trypsin inhibitory activity as result of the K13L substitution at the reactive (P1) site. This protein variant has a novel tight-binding inhibitor activity of pancreatic elastase and increased activity toward neutrophil elastase in comparison to rShPI-1A. In contrast, the substitution Y15S at P2' site did not affect the Ki value against trypsin, but did reduce activity 10-fold against chymotrypsin and neutrophil elastase. Our results provide two new ShPI-1 variants with modified inhibitory activities, one of them with increased biomedical potential. This study also offers new insight into the functional impact of the P1 and P2' sites on ShPI-1 specificity.
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Affiliation(s)
| | - Patrick Ziegelmüller
- Institute of Biochemistry and Molecular Biology, Department of Chemistry, Faculty for Mathematics Informatics and Natural Sciences, University of Hamburg, Germany
| | - Lidice González
- Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, Cuba
| | | | - Yoan Machado
- Centro de Inmunología Molecular, La Habana, Cuba
| | - Lars Redecke
- Institute of Biochemistry, Center for Structural and Cell Biology in Medicine, University of Lübeck, Germany
| | - Ulrich Hahn
- Institute of Biochemistry and Molecular Biology, Department of Chemistry, Faculty for Mathematics Informatics and Natural Sciences, University of Hamburg, Germany
| | - Christian Betzel
- Institute of Biochemistry and Molecular Biology, Department of Chemistry, Faculty for Mathematics Informatics and Natural Sciences, University of Hamburg, Germany
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García-Fernández R, Perbandt M, Rehders D, Ziegelmüller P, Piganeau N, Hahn U, Betzel C, Chávez MDLÁ, Redecke L. Three-dimensional Structure of a Kunitz-type Inhibitor in Complex with an Elastase-like Enzyme. J Biol Chem 2015; 290:14154-65. [PMID: 25878249 DOI: 10.1074/jbc.m115.647586] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Indexed: 11/06/2022] Open
Abstract
Elastase-like enzymes are involved in important diseases such as acute pancreatitis, chronic inflammatory lung diseases, and cancer. Structural insights into their interaction with specific inhibitors will contribute to the development of novel anti-elastase compounds that resist rapid oxidation and proteolysis. Proteinaceous Kunitz-type inhibitors homologous to the bovine pancreatic trypsin inhibitor (BPTI) provide a suitable scaffold, but the structural aspects of their interaction with elastase-like enzymes have not been elucidated. Here, we increased the selectivity of ShPI-1, a versatile serine protease inhibitor from the sea anemone Stichodactyla helianthus with high biomedical and biotechnological potential, toward elastase-like enzymes by substitution of the P1 residue (Lys(13)) with leucine. The variant (rShPI-1/K13L) exhibits a novel anti-porcine pancreatic elastase (PPE) activity together with a significantly improved inhibition of human neuthrophil elastase and chymotrypsin. The crystal structure of the PPE·rShPI-1/K13L complex determined at 2.0 Å resolution provided the first details of the canonical interaction between a BPTI-Kunitz-type domain and elastase-like enzymes. In addition to the essential impact of the variant P1 residue for complex stability, the interface is improved by increased contributions of the primary and secondary binding loop as compared with similar trypsin and chymotrypsin complexes. A comparison of the interaction network with elastase complexes of canonical inhibitors from the chelonian in family supports a key role of the P3 site in ShPI-1 in directing its selectivity against pancreatic and neutrophil elastases. Our results provide the structural basis for site-specific mutagenesis to further improve the binding affinity and/or direct the selectivity of BPTI-Kunitz-type inhibitors toward elastase-like enzymes.
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Affiliation(s)
- Rossana García-Fernández
- From the Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, 20146 Habana, Cuba
| | - Markus Perbandt
- the Institute of Biochemistry and Molecular Biology, Department of Chemistry, University of Hamburg, 22761 Hamburg, Germany, the Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany, and
| | - Dirk Rehders
- the Joint Laboratory for Structural Biology of Infection and Inflammation, Institute of Biochemistry and Molecular Biology, University of Hamburg, 20146 Hamburg, Germany, and Institute of Biochemistry, University of Lübeck, c/o Deutsches Elektronen Synchrotron (DESY), 22603 Hamburg, Germany
| | - Patrick Ziegelmüller
- the Institute of Biochemistry and Molecular Biology, Department of Chemistry, University of Hamburg, 22761 Hamburg, Germany
| | - Nicolas Piganeau
- the Institute of Biochemistry and Molecular Biology, Department of Chemistry, University of Hamburg, 22761 Hamburg, Germany
| | - Ulrich Hahn
- the Institute of Biochemistry and Molecular Biology, Department of Chemistry, University of Hamburg, 22761 Hamburg, Germany
| | - Christian Betzel
- the Institute of Biochemistry and Molecular Biology, Department of Chemistry, University of Hamburg, 22761 Hamburg, Germany
| | | | - Lars Redecke
- the Joint Laboratory for Structural Biology of Infection and Inflammation, Institute of Biochemistry and Molecular Biology, University of Hamburg, 20146 Hamburg, Germany, and Institute of Biochemistry, University of Lübeck, c/o Deutsches Elektronen Synchrotron (DESY), 22603 Hamburg, Germany
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Secretion and assembly of calicivirus-like particles in high-cell-density yeast fermentations: strategies based on a recombinant non-specific BPTI-Kunitz-type protease inhibitor. Appl Microbiol Biotechnol 2014; 99:3875-86. [DOI: 10.1007/s00253-014-6171-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 10/14/2014] [Accepted: 10/15/2014] [Indexed: 10/24/2022]
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Rosti IA, Ramanan RN, Tan JS, Ling TC, Ariff AB. Recovery of Microquantities of Human Epidermal Growth Factor fromEscherichia coliHomogenate andPichia pastorisCulture Medium using Expanded Bed Adsorption. SEP SCI TECHNOL 2014. [DOI: 10.1080/01496395.2013.867351] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Gasser B, Prielhofer R, Marx H, Maurer M, Nocon J, Steiger M, Puxbaum V, Sauer M, Mattanovich D. Pichia pastoris: protein production host and model organism for biomedical research. Future Microbiol 2013; 8:191-208. [DOI: 10.2217/fmb.12.133] [Citation(s) in RCA: 168] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Pichia pastoris is the most frequently used yeast system for heterologous protein production today. The last few years have seen several products based on this platform reach approval as biopharmaceutical drugs. Successful glycoengineering to humanize N-glycans is further fuelling this development. However, detailed understanding of the yeast’s physiology, genetics and regulation has only developed rapidly in the last few years since published genome sequences have become available. An expanding toolbox of genetic elements and strains for the improvement of protein production is being generated, including promoters, gene copy-number enhancement, gene knockout and high-throughput methods. Protein folding and secretion have been identified as significant bottlenecks in yeast expression systems, pinpointing a major target for strain optimization. At the same time, it has become obvious that P. pastoris, as an evolutionarily more ‘ancient’ yeast, may in some cases be a better model for human cell biology and disease than Saccharomyces cerevisiae.
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Affiliation(s)
- Brigitte Gasser
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
- Austrian Centre of Industrial Biotechnology (ACIB GmbH), 1190 Vienna, Austria
| | - Roland Prielhofer
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
| | - Hans Marx
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
| | - Michael Maurer
- Austrian Centre of Industrial Biotechnology (ACIB GmbH), 1190 Vienna, Austria
- University of Applied Sciences FH-Campus Vienna, School of Bioengineering, 1190 Vienna, Austria
| | - Justyna Nocon
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
| | - Matthias Steiger
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
- Austrian Centre of Industrial Biotechnology (ACIB GmbH), 1190 Vienna, Austria
| | - Verena Puxbaum
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
- Austrian Centre of Industrial Biotechnology (ACIB GmbH), 1190 Vienna, Austria
| | - Michael Sauer
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
- Austrian Centre of Industrial Biotechnology (ACIB GmbH), 1190 Vienna, Austria
| | - Diethard Mattanovich
- University of Natural Resources & Life Sciences (BOKU), Department of Biotechnology, 1190 Vienna, Austria
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García-Fernández R, Pons T, Meyer A, Perbandt M, González-González Y, Gil D, de los Angeles Chávez M, Betzel C, Redecke L. Structure of the recombinant BPTI/Kunitz-type inhibitor rShPI-1A from the marine invertebrate Stichodactyla helianthus. Acta Crystallogr Sect F Struct Biol Cryst Commun 2012; 68:1289-93. [PMID: 23143234 PMCID: PMC3515366 DOI: 10.1107/s1744309112039085] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2012] [Accepted: 09/12/2012] [Indexed: 11/10/2022]
Abstract
The BPTI/Kunitz-type inhibitor family includes several extremely potent serine protease inhibitors. To date, the inhibitory mechanisms have only been studied for mammalian inhibitors. Here, the first crystal structure of a BPTI/Kunitz-type inhibitor from a marine invertebrate (rShPI-1A) is reported to 2.5 Å resolution. Crystallization of recombinant rShPI-1A required the salt-induced dissociation of a trypsin complex that was previously formed to avoid intrinsic inhibitor aggregates in solution. The rShPI-1A structure is similar to the NMR structure of the molecule purified from the natural source, but allowed the assignment of disulfide-bridge chiralities and the detection of an internal stabilizing water network. A structural comparison with other BPTI/Kunitz-type canonical inhibitors revealed unusual ϕ angles at positions 17 and 30 to be a particular characteristic of the family. A significant clustering of ϕ and ψ angle values in the glycine-rich remote fragment near the secondary binding loop was additionally identified, but its impact on the specificity of rShPI-1A and similar molecules requires further study.
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Affiliation(s)
- Rossana García-Fernández
- Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, Calle 25 No. 455, Havana 10400, Cuba
| | - Tirso Pons
- Structural Biology and Biocomputing Programme, Spanish National Cancer Research Centre (CNIO), C/Melchor Fernández Almago 3, 28029 Madrid, Spain
| | - Arne Meyer
- Xtal Concepts, Stellinger Steindamm 7, 22527 Hamburg, Germany
| | - Markus Perbandt
- Institute of Biochemistry and Molecular Biology, University of Hamburg, c/o DESY, Notkestrasse 85, 22603 Hamburg, Germany
- Department of Medical Microbiology, Virology and Hygiene, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - Yamile González-González
- Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, Calle 25 No. 455, Havana 10400, Cuba
| | - Dayrom Gil
- Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, Calle 25 No. 455, Havana 10400, Cuba
| | - María de los Angeles Chávez
- Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, Calle 25 No. 455, Havana 10400, Cuba
| | - Christian Betzel
- Institute of Biochemistry and Molecular Biology, University of Hamburg, c/o DESY, Notkestrasse 85, 22603 Hamburg, Germany
| | - Lars Redecke
- Joint Laboratory for Structural Biology of Infection and Inflammation, Institute of Biochemistry and Molecular Biology, University of Hamburg and Institute of Biochemistry, University of Lübeck, c/o DESY, Notkestrasse 85, 22603 Hamburg, Germany
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12
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García-Fernández R, Pons T, Perbandt M, Valiente PA, Talavera A, González-González Y, Rehders D, Chávez MA, Betzel C, Redecke L. Structural insights into serine protease inhibition by a marine invertebrate BPTI Kunitz-type inhibitor. J Struct Biol 2012; 180:271-9. [PMID: 22975140 DOI: 10.1016/j.jsb.2012.08.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 08/22/2012] [Accepted: 08/24/2012] [Indexed: 10/27/2022]
Abstract
Proteins isolated from marine invertebrates are frequently characterized by exceptional structural and functional properties. ShPI-1, a BPTI Kunitz-type inhibitor from the Caribbean Sea anemone Stichodactyla helianthus, displays activity not only against serine-, but also against cysteine-, and aspartate proteases. As an initial step to evaluate the molecular basis of its activities, we describe the crystallographic structure of ShPI-1 in complex with the serine protease bovine pancreatic trypsin at 1.7Å resolution. The overall structure and the important enzyme-inhibitor interactions of this first invertebrate BPTI-like Kunitz-type inhibitor:trypsin complex remained largely conserved compared to mammalian BPTI-Kunitz inhibitor complexes. However, a prominent stabilizing role within the interface was attributed to arginine at position P3. Binding free-energy calculations indicated a 10-fold decrease for the inhibitor affinity against trypsin, if the P3 residue of ShPI-1 is mutated to alanine. Together with the increased role of Arg(11) at P3 position, slightly reduced interactions at the prime side (Pn') of the primary binding loop and at the secondary binding loop of ShPI-1 were detected. In addition, the structure provides important information for site directed mutagenesis to further optimize the activity of rShPI-1A for biotechnological applications.
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Affiliation(s)
- Rossana García-Fernández
- Centro de Estudio de Proteínas, Facultad de Biología, Universidad de la Habana, Calle 25 No 411, Havana, Cuba
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Atypical reactive center Kunitz-type inhibitor from the sea anemone Heteractis crispa. Mar Drugs 2012; 10:1545-1565. [PMID: 22851925 PMCID: PMC3407930 DOI: 10.3390/md10071545] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 07/04/2012] [Accepted: 07/11/2012] [Indexed: 12/31/2022] Open
Abstract
The primary structure of a new Kunitz-type protease inhibitor InhVJ from the sea anemone Heteractis crispa (Radianthus macrodactylus) was determined by protein sequencing and cDNA cloning. InhVJ amino acid sequence was shown to share high sequence identity (up to 98%) with the other known Kunitz-type sea anemones sequences. It was determined that the P1 Thr at the reactive site resulted in a decrease of the K(i) of InhVJ to trypsin and α-chymotrypsin (7.38 × 10(-8) M and 9.93 × 10(-7) M, respectively). By structure modeling the functional importance of amino acids at the reactive site as well as at the weak contact site were determined. The significant role of Glu45 for the orientation and stabilization of the InhVJ-trypsin complex was elucidated. We can suggest that there has been an adaptive evolution of the P1 residue at the inhibitor reactive site providing specialization or functional diversification of the paralogs. The appearance of a key so-called P1 Thr residue instead of Lys might lead to refinement of inhibitor specificity in the direction of subfamilies of serine proteases. The absence of Kv channel and TRPV1-receptor modulation activity was confirmed by electrophysiological screening tests.
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