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Książek M, Goulas T, Mizgalska D, Rodríguez-Banqueri A, Eckhard U, Veillard F, Waligórska I, Benedyk-Machaczka M, Sochaj-Gregorczyk AM, Madej M, Thøgersen IB, Enghild JJ, Cuppari A, Arolas JL, de Diego I, López-Pelegrín M, Garcia-Ferrer I, Guevara T, Dive V, Zani ML, Moreau T, Potempa J, Gomis-Rüth FX. A unique network of attack, defence and competence on the outer membrane of the periodontitis pathogen Tannerella forsythia. Chem Sci 2023; 14:869-888. [PMID: 36755705 PMCID: PMC9890683 DOI: 10.1039/d2sc04166a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 12/09/2022] [Indexed: 12/14/2022] Open
Abstract
Periodontopathogenic Tannerella forsythia uniquely secretes six peptidases of disparate catalytic classes and families that operate as virulence factors during infection of the gums, the KLIKK-peptidases. Their coding genes are immediately downstream of novel ORFs encoding the 98-132 residue potempins (Pot) A, B1, B2, C, D and E. These are outer-membrane-anchored lipoproteins that specifically and potently inhibit the respective downstream peptidase through stable complexes that protect the outer membrane of T. forsythia, as shown in vivo. Remarkably, PotA also contributes to bacterial fitness in vivo and specifically inhibits matrix metallopeptidase (MMP) 12, a major defence component of oral macrophages, thus featuring a novel and highly-specific physiological MMP inhibitor. Information from 11 structures and high-confidence homology models showed that the potempins are distinct β-barrels with either a five-stranded OB-fold (PotA, PotC and PotD) or an eight-stranded up-and-down fold (PotE, PotB1 and PotB2), which are novel for peptidase inhibitors. Particular loops insert like wedges into the active-site cleft of the genetically-linked peptidases to specifically block them either via a new "bilobal" or the classic "standard" mechanism of inhibition. These results discover a unique, tightly-regulated proteolytic armamentarium for virulence and competence, the KLIKK-peptidase/potempin system.
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Affiliation(s)
- Mirosław Książek
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland .,Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry Louisville 40202 KY USA
| | - Theodoros Goulas
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain .,Department of Food Science and Nutrition, School of Agricultural Sciences, University of Thessaly Temponera str. Karditsa 43100 Greece
| | - Danuta Mizgalska
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland
| | - Arturo Rodríguez-Banqueri
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain
| | - Ulrich Eckhard
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain
| | - Florian Veillard
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland
| | - Irena Waligórska
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland
| | - Małgorzata Benedyk-Machaczka
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland
| | - Alicja M. Sochaj-Gregorczyk
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian UniversityGronostajowa 7Kraków 30-387Poland
| | - Mariusz Madej
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland
| | - Ida B. Thøgersen
- Department of Molecular Biology and Genetics, Aarhus UniversityUniversitetsbyen 81Aarhus C 8000Denmark
| | - Jan J. Enghild
- Department of Molecular Biology and Genetics, Aarhus UniversityUniversitetsbyen 81Aarhus C 8000Denmark
| | - Anna Cuppari
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain
| | - Joan L. Arolas
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Parkc/Baldiri Reixac, 15-21Barcelona 08028CataloniaSpain
| | - Iñaki de Diego
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain .,Sample Environment and Characterization Group, European XFEL GmbH Holzkoppel 4 Schenefeld 22869 Germany
| | - Mar López-Pelegrín
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain
| | - Irene Garcia-Ferrer
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain
| | - Tibisay Guevara
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Park c/Baldiri Reixac, 15-21 Barcelona 08028 Catalonia Spain
| | - Vincent Dive
- Université Paris-Saclay, CEA, INRAE, Département Médicaments et Technologies pour la Santé (DMTS), ERL CNRS 9004Gif-sur-Yvette 91191France
| | - Marie-Louise Zani
- Departement de Biochimie, Université de Tours10 Bd. TonelléTours Cedex 37032France
| | | | - Jan Potempa
- Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University Gronostajowa 7 Kraków 30-387 Poland .,Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry Louisville 40202 KY USA
| | - F. Xavier Gomis-Rüth
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona (CSIC), Barcelona Science Parkc/Baldiri Reixac, 15-21Barcelona 08028CataloniaSpain
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Sponga A, Arolas JL, Schwarz TC, Jeffries CM, Rodriguez Chamorro A, Kostan J, Ghisleni A, Drepper F, Polyansky A, De Almeida Ribeiro E, Pedron M, Zawadzka-Kazimierczuk A, Mlynek G, Peterbauer T, Doto P, Schreiner C, Hollerl E, Mateos B, Geist L, Faulkner G, Kozminski W, Svergun DI, Warscheid B, Zagrovic B, Gautel M, Konrat R, Djinović-Carugo K. Order from disorder in the sarcomere: FATZ forms a fuzzy complex and phase-separated macromolecular condensates with α-actinin. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321093946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sponga A, Arolas JL, Schwarz TC, Jeffries CM, Rodriguez Chamorro A, Kostan J, Ghisleni A, Drepper F, Polyansky A, De Almeida Ribeiro E, Pedron M, Zawadzka-Kazimierczuk A, Mlynek G, Peterbauer T, Doto P, Schreiner C, Hollerl E, Mateos B, Geist L, Faulkner G, Kozminski W, Svergun DI, Warscheid B, Zagrovic B, Gautel M, Konrat R, Djinović-Carugo K. Order from disorder in the sarcomere: FATZ forms a fuzzy but tight complex and phase-separated condensates with α-actinin. Sci Adv 2021; 7:eabg7653. [PMID: 34049882 PMCID: PMC8163081 DOI: 10.1126/sciadv.abg7653] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Accepted: 04/13/2021] [Indexed: 05/03/2023]
Abstract
In sarcomeres, α-actinin cross-links actin filaments and anchors them to the Z-disk. FATZ (filamin-, α-actinin-, and telethonin-binding protein of the Z-disk) proteins interact with α-actinin and other core Z-disk proteins, contributing to myofibril assembly and maintenance. Here, we report the first structure and its cellular validation of α-actinin-2 in complex with a Z-disk partner, FATZ-1, which is best described as a conformational ensemble. We show that FATZ-1 forms a tight fuzzy complex with α-actinin-2 and propose an interaction mechanism via main molecular recognition elements and secondary binding sites. The obtained integrative model reveals a polar architecture of the complex which, in combination with FATZ-1 multivalent scaffold function, might organize interaction partners and stabilize α-actinin-2 preferential orientation in Z-disk. Last, we uncover FATZ-1 ability to phase-separate and form biomolecular condensates with α-actinin-2, raising the question whether FATZ proteins can create an interaction hub for Z-disk proteins through membraneless compartmentalization during myofibrillogenesis.
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Affiliation(s)
- Antonio Sponga
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Joan L Arolas
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Thomas C Schwarz
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Cy M Jeffries
- European Molecular Biology Laboratory (EMBL), Hamburg Unit, Hamburg, Germany
| | - Ariadna Rodriguez Chamorro
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Julius Kostan
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Andrea Ghisleni
- King's College London BHF Centre for Research Excellence, Randall Centre for Cell and Molecular Biophysics, London SE1 1UL, UK
| | - Friedel Drepper
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
- Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Anton Polyansky
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
- National Research University Higher School of Economics, Moscow 101000, Russia
| | - Euripedes De Almeida Ribeiro
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Miriam Pedron
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Anna Zawadzka-Kazimierczuk
- Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Zwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Georg Mlynek
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Thomas Peterbauer
- Department of Biochemistry and Cell Biology, Max Perutz Labs, University of Vienna, Dr. BohrGasse 9, A-1030 Vienna, Austria
| | - Pierantonio Doto
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Claudia Schreiner
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Eneda Hollerl
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Borja Mateos
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Leonhard Geist
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | | | - Wiktor Kozminski
- Biological and Chemical Research Centre, Faculty of Chemistry, University of Warsaw, Zwirki i Wigury 101, 02-089 Warsaw, Poland
| | - Dmitri I Svergun
- King's College London BHF Centre for Research Excellence, Randall Centre for Cell and Molecular Biophysics, London SE1 1UL, UK
| | - Bettina Warscheid
- Biochemistry and Functional Proteomics, Institute of Biology II, Faculty of Biology, University of Freiburg, 79104 Freiburg, Germany
- Signalling Research Centres BIOSS and CIBSS, University of Freiburg, 79104 Freiburg, Germany
| | - Bojan Zagrovic
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Mathias Gautel
- King's College London BHF Centre for Research Excellence, Randall Centre for Cell and Molecular Biophysics, London SE1 1UL, UK
| | - Robert Konrat
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria
| | - Kristina Djinović-Carugo
- Department of Structural and Computational Biology, Max Perutz Labs, University of Vienna, Campus Vienna Biocenter 5, A-1030 Vienna, Austria.
- Department of Biochemistry, Faculty of Chemistry and Chemical Technology, University of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
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Sponga A, Arolas JL, Schwarz TC, Jeffries CM, Kostan J, Polyansky AA, Zagrovic B, Svergun D, Warscheid B, Konrat R, Gautel M, Djinovic-Carugo K. Sarcomeric Protein Fatz Forms a Tight Fuzzy Complex with α-Actinin and Phase-Separates in Vitro. Biophys J 2021. [DOI: 10.1016/j.bpj.2020.11.604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Zheng W, Arolas JL, Vujin S, Djinovic-Carugo K, Egelman EH. Structural Insights into the Disease-Causing Mutant α-Actinin 4 K255E Bound to F-Actin. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.3100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Abstract
Metallopeptidases cleave polypeptides bound in the active-site cleft of catalytic domains through a general base/acid mechanism. This involves a solvent molecule bound to a catalytic zinc and general regulation of the mechanism through zymogen-based latency. Sixty reported structures from 11 metallopeptidase families reveal that prosegments, mostly N-terminal of the catalytic domain, block the cleft regardless of their size. Prosegments may be peptides (5-14 residues), which are only structured within the zymogens, or large moieties (<227 residues) of one or two folded domains. While some prosegments globally shield the catalytic domain through a few contacts, others specifically run across the cleft in the same or opposite direction as a substrate, making numerous interactions. Some prosegments block the zinc by replacing the solvent with particular side chains, while others use terminal α-amino or carboxylate groups. Overall, metallopeptidase zymogens employ disparate mechanisms that diverge even within families, which supports that latency is less conserved than catalysis.
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Affiliation(s)
- Joan L Arolas
- Proteolysis Laboratory, Structural Biology Unit ("María-de-Maeztu" Unit of Excellence) , Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas , Barcelona Science Park, c/Baldiri Reixac 15-21 , 08028 Barcelona , Catalonia , Spain
| | - Theodoros Goulas
- Proteolysis Laboratory, Structural Biology Unit ("María-de-Maeztu" Unit of Excellence) , Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas , Barcelona Science Park, c/Baldiri Reixac 15-21 , 08028 Barcelona , Catalonia , Spain
| | - Anna Cuppari
- Proteolysis Laboratory, Structural Biology Unit ("María-de-Maeztu" Unit of Excellence) , Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas , Barcelona Science Park, c/Baldiri Reixac 15-21 , 08028 Barcelona , Catalonia , Spain
| | - F Xavier Gomis-Rüth
- Proteolysis Laboratory, Structural Biology Unit ("María-de-Maeztu" Unit of Excellence) , Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas , Barcelona Science Park, c/Baldiri Reixac 15-21 , 08028 Barcelona , Catalonia , Spain
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Arolas JL, Goulas T, Pomerantsev AP, Leppla SH, Gomis-Rüth FX. Structural Basis for Latency and Function of Immune Inhibitor A Metallopeptidase, a Modulator of the Bacillus anthracis Secretome. Structure 2016; 24:25-36. [PMID: 26745529 DOI: 10.1016/j.str.2015.10.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2015] [Revised: 10/15/2015] [Accepted: 10/15/2015] [Indexed: 01/07/2023]
Abstract
Immune inhibitor A(InhA)-type metallopeptidases are potential virulence factors secreted by members of the Bacillus cereus group. Two paralogs from anthrax-causing Bacillus anthracis (BaInhA1 and BaInhA2) were shown to degrade host tissue proteins with broad substrate specificity. Analysis of their activation mechanism and the crystal structure of a zymogenic BaInhA2 variant revealed a ∼750-residue four-domain structure featuring a pro-peptide, a catalytic domain, a domain reminiscent of viral envelope glycoproteins, and a MAM domain grafted into the latter. This domain, previously found only in eukaryotes, is required for proper protein expression in B. anthracis and evinces certain flexibility. Latency is uniquely modulated by the N-terminal segment of the pro-peptide, which binds the catalytic zinc through its α-amino group and occupies the primed side of the active-site cleft. The present results further our understanding of the modus operandi of an anthrax secretome regulator.
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Affiliation(s)
- Joan L Arolas
- Proteolysis Lab, Department of Structural Biology ("María de Maeztu" Unit of Excellence), Molecular Biology Institute of Barcelona, Spanish Research Council (CSIC), Barcelona Science Park, Helix Building, Baldiri Reixac, 15-21, 08028 Barcelona, Spain
| | - Theodoros Goulas
- Proteolysis Lab, Department of Structural Biology ("María de Maeztu" Unit of Excellence), Molecular Biology Institute of Barcelona, Spanish Research Council (CSIC), Barcelona Science Park, Helix Building, Baldiri Reixac, 15-21, 08028 Barcelona, Spain
| | - Andrei P Pomerantsev
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Stephen H Leppla
- Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - F Xavier Gomis-Rüth
- Proteolysis Lab, Department of Structural Biology ("María de Maeztu" Unit of Excellence), Molecular Biology Institute of Barcelona, Spanish Research Council (CSIC), Barcelona Science Park, Helix Building, Baldiri Reixac, 15-21, 08028 Barcelona, Spain.
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López-Pelegrín M, Ksiazek M, Karim AY, Guevara T, Arolas JL, Potempa J, Gomis-Rüth FX. A novel mechanism of latency in matrix metalloproteinases. J Biol Chem 2015; 290:4728-4740. [PMID: 25555916 DOI: 10.1074/jbc.m114.605956] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The matrix metalloproteinases (MMPs) are a family of secreted soluble or membrane-anchored multimodular peptidases regularly found in several paralogous copies in animals and plants, where they have multiple functions. The minimal consensus domain architecture comprises a signal peptide, a 60-90-residue globular prodomain with a conserved sequence motif including a cysteine engaged in "cysteine-switch" or "Velcro" mediated latency, and a catalytic domain. Karilysin, from the human periodontopathogen Tannerella forsythia, is the only bacterial MMP to have been characterized biochemically to date. It shares with eukaryotic forms the catalytic domain but none of the flanking domains. Instead of the consensus MMP prodomain, it features a 14-residue propeptide, the shortest reported for a metallopeptidase, which lacks cysteines. Here we determined the structure of a prokarilysin fragment encompassing the propeptide and the catalytic domain, and found that the former runs across the cleft in the opposite direction to a bound substrate and inhibits the latter through an "aspartate-switch" mechanism. This finding is reminiscent of latency maintenance in the otherwise unrelated astacin and fragilysin metallopeptidase families. In addition, in vivo and biochemical assays showed that the propeptide contributes to protein folding and stability. Our analysis of prokarilysin reveals a novel mechanism of latency and activation in MMPs. Finally, our findings support the view that the karilysin catalytic domain was co-opted by competent bacteria through horizontal gene transfer from a eukaryotic source, and later evolved in a specific bacterial environment.
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Affiliation(s)
- Mar López-Pelegrín
- From the Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, c/Baldiri Reixac, 15-21, 08028 Barcelona, Catalonia, Spain
| | - Miroslaw Ksiazek
- the Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Ul. Gronostajowa 7, 30-387 Kraków, Poland, and
| | - Abdulkarim Y Karim
- the Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Ul. Gronostajowa 7, 30-387 Kraków, Poland, and
| | - Tibisay Guevara
- From the Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, c/Baldiri Reixac, 15-21, 08028 Barcelona, Catalonia, Spain
| | - Joan L Arolas
- From the Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, c/Baldiri Reixac, 15-21, 08028 Barcelona, Catalonia, Spain,.
| | - Jan Potempa
- the Department of Microbiology, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Ul. Gronostajowa 7, 30-387 Kraków, Poland, and; the Oral Immunology and Infectious Disease, University of Louisville School of Dentistry, Louisville, Kentucky 40202.
| | - F Xavier Gomis-Rüth
- From the Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, c/Baldiri Reixac, 15-21, 08028 Barcelona, Catalonia, Spain,.
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Goulas T, Cuppari A, Garcia-Castellanos R, Snipas S, Glockshuber R, Arolas JL, Gomis-Rüth FX. The pCri System: a vector collection for recombinant protein expression and purification. PLoS One 2014; 9:e112643. [PMID: 25386923 PMCID: PMC4227841 DOI: 10.1371/journal.pone.0112643] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 10/09/2014] [Indexed: 12/11/2022] Open
Abstract
A major bottleneck in structural, biochemical and biophysical studies of proteins is the need for large amounts of pure homogenous material, which is generally obtained by recombinant overexpression. Here we introduce a vector collection, the pCri System, for cytoplasmic and periplasmic/extracellular expression of heterologous proteins that allows the simultaneous assessment of prokaryotic and eukaryotic host cells (Escherichia coli, Bacillus subtilis, and Pichia pastoris). By using a single polymerase chain reaction product, genes of interest can be directionally cloned in all vectors within four different rare restriction sites at the 5'end and multiple cloning sites at the 3'end. In this way, a number of different fusion tags but also signal peptides can be incorporated at the N- and C-terminus of proteins, facilitating their expression, solubility and subsequent detection and purification. Fusion tags can be efficiently removed by treatment with site-specific peptidases, such as tobacco etch virus proteinase, thrombin, or sentrin specific peptidase 1, which leave only a few extra residues at the N-terminus of the protein. The combination of different expression systems in concert with the cloning approach in vectors that can fuse various tags makes the pCri System a valuable tool for high throughput studies.
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Affiliation(s)
- Theodoros Goulas
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, Helix Building, Barcelona, Spain
- * E-mail: (TG); (FXGR)
| | - Anna Cuppari
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, Helix Building, Barcelona, Spain
| | - Raquel Garcia-Castellanos
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, Helix Building, Barcelona, Spain
| | - Scott Snipas
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Rudi Glockshuber
- Institute of Molecular Biology and Biophysics, Department of Biology, Zurich, Switzerland
| | - Joan L. Arolas
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, Helix Building, Barcelona, Spain
| | - F. Xavier Gomis-Rüth
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, Helix Building, Barcelona, Spain
- * E-mail: (TG); (FXGR)
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López-Pelegrín M, Cerdà-Costa N, Cintas-Pedrola A, Herranz-Trillo F, Bernadó P, Peinado JR, Arolas JL, Gomis-Rüth FX. Frontispiece: Multiple Stable Conformations Account for Reversible Concentration-Dependent Oligomerization and Autoinhibition of a Metamorphic Metallopeptidase. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/anie.201484071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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López-Pelegrín M, Cerdà-Costa N, Cintas-Pedrola A, Herranz-Trillo F, Bernadó P, Peinado JR, Arolas JL, Gomis-Rüth FX. Frontispiz: Multiple Stable Conformations Account for Reversible Concentration-Dependent Oligomerization and Autoinhibition of a Metamorphic Metallopeptidase. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201484071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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López-Pelegrín M, Cerdà-Costa N, Cintas-Pedrola A, Herranz-Trillo F, Bernadó P, Peinado JR, Arolas JL, Gomis-Rüth FX. Multiple stable conformations account for reversible concentration-dependent oligomerization and autoinhibition of a metamorphic metallopeptidase. Angew Chem Int Ed Engl 2014; 53:10624-30. [PMID: 25159620 DOI: 10.1002/anie.201405727] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Indexed: 11/09/2022]
Abstract
Molecular plasticity controls enzymatic activity: the native fold of a protein in a given environment is normally unique and at a global free-energy minimum. Some proteins, however, spontaneously undergo substantial fold switching to reversibly transit between defined conformers, the "metamorphic" proteins. Here, we present a minimal metamorphic, selective, and specific caseinolytic metallopeptidase, selecase, which reversibly transits between several different states of defined three-dimensional structure, which are associated with loss of enzymatic activity due to autoinhibition. The latter is triggered by sequestering the competent conformation in incompetent but structured dimers, tetramers, and octamers. This system, which is compatible with a discrete multifunnel energy landscape, affords a switch that provides a reversible mechanism of control of catalytic activity unique in nature.
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Affiliation(s)
- Mar López-Pelegrín
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park c/Baldiri Reixac, 15-21, 08028 Barcelona (Spain) http://www.ibmb.csic.es/home/xgomis
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13
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Arolas JL, García-Castellanos R, Goulas T, Akiyama Y, Gomis-Rüth FX. Expression and purification of integral membrane metallopeptidase HtpX. Protein Expr Purif 2014; 99:113-8. [PMID: 24769134 DOI: 10.1016/j.pep.2014.04.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2014] [Revised: 03/24/2014] [Accepted: 04/16/2014] [Indexed: 11/29/2022]
Abstract
Little is known about the catalytic mechanism of integral membrane (IM) peptidases. HtpX is an IM metallopeptidase that plays a central role in protein quality control by preventing the accumulation of misfolded proteins in the membrane. Here we report the recombinant overexpression and purification of a catalytically ablated form of HtpX from Escherichia coli. Several E. coli strains, expression vectors, detergents, and purification strategies were tested to achieve maximum yields of pure and well-folded protein. HtpX was successfully overexpressed in E. coli BL21(DE3) cells using a pET-derived vector attaching a C-terminal His8-tag, extracted from the membranes using octyl-β-d-glucoside, and purified to homogeneity in the presence of this detergent in three consecutive steps: cobalt-affinity, anion-exchange, and size-exclusion chromatography. The production of HtpX in milligram amounts paves the way for structural studies, which will be essential to understand the catalytic mechanism of this IM peptidase and related family members.
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Affiliation(s)
- Joan L Arolas
- Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, E-08028 Barcelona, Spain.
| | - Raquel García-Castellanos
- Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, E-08028 Barcelona, Spain
| | - Theodoros Goulas
- Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, E-08028 Barcelona, Spain
| | - Yoshinori Akiyama
- Institute for Virus Research, Kyoto University, Kyoto 606-8507, Japan
| | - F Xavier Gomis-Rüth
- Proteolysis Lab, Department of Structural Biology, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, E-08028 Barcelona, Spain.
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14
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López-Pelegrín M, Cerdà-Costa N, Martínez-Jiménez F, Cintas-Pedrola A, Canals A, Peinado JR, Marti-Renom MA, López-Otín C, Arolas JL, Gomis-Rüth FX. A novel family of soluble minimal scaffolds provides structural insight into the catalytic domains of integral membrane metallopeptidases. J Biol Chem 2013; 288:21279-21294. [PMID: 23733187 PMCID: PMC3774397 DOI: 10.1074/jbc.m113.476580] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 05/13/2013] [Indexed: 11/06/2022] Open
Abstract
In the search for structural models of integral-membrane metallopeptidases (MPs), we discovered three related proteins from thermophilic prokaryotes, which we grouped into a novel family called "minigluzincins." We determined the crystal structures of the zymogens of two of these (Pyrococcus abyssi proabylysin and Methanocaldococcus jannaschii projannalysin), which are soluble and, with ∼100 residues, constitute the shortest structurally characterized MPs to date. Despite relevant sequence and structural similarity, the structures revealed two unique mechanisms of latency maintenance through the C-terminal segments previously unseen in MPs as follows: intramolecular, through an extended tail, in proabylysin, and crosswise intermolecular, through a helix swap, in projannalysin. In addition, structural and sequence comparisons revealed large similarity with MPs of the gluzincin tribe such as thermolysin, leukotriene A4 hydrolase relatives, and cowrins. Noteworthy, gluzincins mostly contain a glutamate as third characteristic zinc ligand, whereas minigluzincins have a histidine. Sequence and structural similarity further allowed us to ascertain that minigluzincins are very similar to the catalytic domains of integral membrane MPs of the MEROPS database families M48 and M56, such as FACE1, HtpX, Oma1, and BlaR1/MecR1, which are provided with trans-membrane helices flanking or inserted into a minigluzincin-like catalytic domain. In a time where structural biochemistry of integral-membrane proteins in general still faces formidable challenges, the minigluzincin soluble minimal scaffold may contribute to our understanding of the working mechanisms of these membrane MPs and to the design of novel inhibitors through structure-aided rational drug design approaches.
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Affiliation(s)
- Mar López-Pelegrín
- From the Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, c/Baldiri Reixac, 15-21, 08028 Barcelona
| | - Núria Cerdà-Costa
- From the Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, c/Baldiri Reixac, 15-21, 08028 Barcelona
| | - Francisco Martínez-Jiménez
- the Genome Biology Group, Centre Nacional d'Anàlisi Genòmic, c/Baldiri Reixac, 4, 08028 Barcelona,; the Gene Regulation, Stem Cells and Cancer Program, Center for Genomic Regulation, c/Dr. Aiguader, 88, 08003 Barcelona
| | - Anna Cintas-Pedrola
- From the Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, c/Baldiri Reixac, 15-21, 08028 Barcelona
| | - Albert Canals
- the Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas and Institute for Research in Biomedicine, c/Baldiri Reixac, 10-12, 08028 Barcelona, and
| | - Juan R Peinado
- From the Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, c/Baldiri Reixac, 15-21, 08028 Barcelona
| | - Marc A Marti-Renom
- the Genome Biology Group, Centre Nacional d'Anàlisi Genòmic, c/Baldiri Reixac, 4, 08028 Barcelona,; the Gene Regulation, Stem Cells and Cancer Program, Center for Genomic Regulation, c/Dr. Aiguader, 88, 08003 Barcelona
| | - Carlos López-Otín
- the Departamento de Bioquímica y Biología Molecular and Instituto Universitario de Oncología, Universidad de Oviedo, 33006 Oviedo, Spain
| | - Joan L Arolas
- From the Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, c/Baldiri Reixac, 15-21, 08028 Barcelona,.
| | - F Xavier Gomis-Rüth
- From the Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Consejo Superior de Investigaciones Científicas, c/Baldiri Reixac, 15-21, 08028 Barcelona,.
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Trillo-Muyo S, Jasilionis A, Domagalski MJ, Chruszcz M, Minor W, Kuisiene N, Arolas JL, Solà M, Gomis-Rüth FX. Ultratight crystal packing of a 10 kDa protein. Acta Crystallogr D Biol Crystallogr 2013; 69:464-70. [PMID: 23519421 PMCID: PMC4048058 DOI: 10.1107/s0907444912050135] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Accepted: 12/07/2012] [Indexed: 11/10/2022]
Abstract
While small organic molecules generally crystallize forming tightly packed lattices with little solvent content, proteins form air-sensitive high-solvent-content crystals. Here, the crystallization and full structure analysis of a novel recombinant 10 kDa protein corresponding to the C-terminal domain of a putative U32 peptidase are reported. The orthorhombic crystal contained only 24.5% solvent and is therefore among the most tightly packed protein lattices ever reported.
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Affiliation(s)
- Sergio Trillo-Muyo
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Spanish Research Council CSIC, Barcelona Science Park, c/Baldiri Reixac 15-21, 08028 Barcelona, Spain
| | - Andrius Jasilionis
- Department of Microbiology and Biotechnology, Vilnius University, M. K. Čiurlionio 21/27, 03101 Vilnius, Lithuania
| | - Marcin J. Domagalski
- Department of Molecular Physiology and Biological Physics, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, VA 22908-0736, USA
| | - Maksymilian Chruszcz
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA
| | - Wladek Minor
- Department of Molecular Physiology and Biological Physics, University of Virginia, 1340 Jefferson Park Avenue, Charlottesville, VA 22908-0736, USA
| | - Nomeda Kuisiene
- Department of Microbiology and Biotechnology, Vilnius University, M. K. Čiurlionio 21/27, 03101 Vilnius, Lithuania
| | - Joan L. Arolas
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Spanish Research Council CSIC, Barcelona Science Park, c/Baldiri Reixac 15-21, 08028 Barcelona, Spain
| | - Maria Solà
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Spanish Research Council CSIC, Barcelona Science Park, c/Baldiri Reixac 15-21, 08028 Barcelona, Spain
| | - F. Xavier Gomis-Rüth
- Proteolysis Laboratory, Department of Structural Biology, Molecular Biology Institute of Barcelona, Spanish Research Council CSIC, Barcelona Science Park, c/Baldiri Reixac 15-21, 08028 Barcelona, Spain
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Trillo-Muyo S, Martínez-Rodríguez S, Arolas JL, Gomis-Rüth FX. Mechanism of action of a Janus-faced single-domain proteininhibitor simultaneously targeting two peptidase classes. Chem Sci 2013. [DOI: 10.1039/c2sc21712k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Arolas JL, Botelho TO, Vilcinskas A, Gomis-Rüth FX. Structural Evidence for Standard-Mechanism Inhibition in Metallopeptidases from a Complex Poised to Resynthesize a Peptide Bond. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201103262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Arolas JL, Botelho TO, Vilcinskas A, Gomis-Rüth FX. Structural evidence for standard-mechanism inhibition in metallopeptidases from a complex poised to resynthesize a peptide bond. Angew Chem Int Ed Engl 2011; 50:10357-60. [PMID: 21915964 DOI: 10.1002/anie.201103262] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Joan L Arolas
- Proteolysis Lab, Molecular Biology Institute of Barcelona, CSIC, Barcelona Science Park, c/Baldiri Reixac, 15-21, 08028 Barcelona, Spain
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19
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Abstract
The correct balance between proteases and their natural protein inhibitors is of great importance in living systems. Protease inhibitors usually comprise small folds that are crosslinked by a high number of disulfide bonds, making them perfect models for the study of oxidative folding. To date, the oxidative folding of numerous protease inhibitors has been analyzed, revealing a great diversity of folding pathways that differ mainly in the heterogeneity and native disulfide-bond content of their intermediates. The two extremes of this diversity are represented by bovine pancreatic trypsin inhibitor and hirudin, which fold, respectively, via few native intermediates and heterogeneous scrambled isomers. Other proteins, such as leech carboxypeptidase inhibitor, share characteristics of both models displaying mixed folding pathways. The study of the oxidative folding of two-domain inhibitors, such as secretory leukocyte protease inhibitor, tick carboxypeptidase inhibitor, and Ascaris carboxypeptidase inhibitor, has provided some clues about how two-domain protease inhibitors may fold, that is, either by folding each domain autonomously or with one domain assisting in the folding of the other. Finally, the recent determination of the structures of the major intermediates of protease inhibitors has shed light on the molecular mechanisms guiding the oxidative folding of small disulfide-rich proteins.
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Affiliation(s)
- Joan L Arolas
- Departament de Bioquímica i Biologia Molecular, Institut de Biotecnologia i Biomedicina, Universitat Autònoma de Barcelona, Bellaterra (Barcelona), Spain
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20
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Cerdà-Costa N, Guevara T, Karim AY, Ksiazek M, Nguyen KA, Arolas JL, Potempa J, Gomis-Rüth FX. The structure of the catalytic domain of Tannerella forsythia karilysin reveals it is a bacterial xenologue of animal matrix metalloproteinases. Mol Microbiol 2011; 79:119-32. [PMID: 21166898 PMCID: PMC3077575 DOI: 10.1111/j.1365-2958.2010.07434.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Metallopeptidases (MPs) are among virulence factors secreted by pathogenic bacteria at the site of infection. One such pathogen is Tannerella forsythia, a member of the microbial consortium that causes peridontitis, arguably the most prevalent infective chronic inflammatory disease known to mankind. The only reported MP secreted by T. forsythia is karilysin, a 52 kDa multidomain protein comprising a central 18 kDa catalytic domain (CD), termed Kly18, flanked by domains unrelated to any known protein. We analysed the 3D structure of Kly18 in the absence and presence of Mg(2+) or Ca(2+) , which are required for function and stability, and found that it evidences most of the structural features characteristic of the CDs of mammalian matrix metalloproteinases (MMPs). Unexpectedly, a peptide was bound to the active-site cleft of Kly18 mimicking a left-behind cleavage product, which revealed that the specificity pocket accommodates bulky hydrophobic side-chains of substrates as in mammalian MMPs. In addition, Kly18 displayed a unique Mg(2+) or Ca(2+) binding site and two flexible segments that could play a role in substrate binding. Phylogenetic and sequence similarity studies revealed that Kly18 is evolutionarily much closer to winged-insect and mammalian MMPs than to potential bacterial counterparts found by genomic sequencing projects. Therefore, we conclude that this first structurally characterized non-mammalian MMP is a xenologue co-opted through horizontal gene transfer during the intimate coexistence between T. forsythia and humans or other animals, in a very rare case of gene shuffling from eukaryotes to prokaryotes. Subsequently, this protein would have evolved in a bacterial environment to give rise to full-length karilysin that is furnished with unique flanking domains that do not conform to the general multidomain architecture of animal MMPs.
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Affiliation(s)
- Núria Cerdà-Costa
- Proteolysis Lab; Department of Structural Biology; Molecular Biology Institute of Barcelona, CSIC; Barcelona Science Park; Helix Building; c/ Baldiri Reixac, 15-21; E-08028 Barcelona (Catalunya)
| | - Tibisay Guevara
- Proteolysis Lab; Department of Structural Biology; Molecular Biology Institute of Barcelona, CSIC; Barcelona Science Park; Helix Building; c/ Baldiri Reixac, 15-21; E-08028 Barcelona (Catalunya)
| | - Abdulkarim Y. Karim
- Department of Microbiology; Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; PL-Krakow 30-387 (Poland)
| | - Miroslaw Ksiazek
- Department of Microbiology; Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; PL-Krakow 30-387 (Poland)
| | - Ky-Anh Nguyen
- Institute of Dental Research, Westmead Centre for Oral Health, Sydney NSW 2145 (Australia)
- Faculty of Dentistry, University of Sydney, Sydney NSW 2006 (Australia)
| | - Joan L. Arolas
- Proteolysis Lab; Department of Structural Biology; Molecular Biology Institute of Barcelona, CSIC; Barcelona Science Park; Helix Building; c/ Baldiri Reixac, 15-21; E-08028 Barcelona (Catalunya)
| | - Jan Potempa
- Department of Microbiology; Faculty of Biochemistry, Biophysics and Biotechnology; Jagiellonian University; PL-Krakow 30-387 (Poland)
- University of Louisville; School of Dentistry; Oral Health and Systemic Disease; Louisville, KY 40202 (USA)
| | - F. Xavier Gomis-Rüth
- Proteolysis Lab; Department of Structural Biology; Molecular Biology Institute of Barcelona, CSIC; Barcelona Science Park; Helix Building; c/ Baldiri Reixac, 15-21; E-08028 Barcelona (Catalunya)
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Valnickova Z, Sanglas L, Arolas JL, Petersen SV, Schar C, Otzen D, Aviles FX, Gomis-Rüth FX, Enghild JJ. Flexibility of the thrombin-activatable fibrinolysis inhibitor pro-domain enables productive binding of protein substrates. J Biol Chem 2010; 285:38243-50. [PMID: 20880845 DOI: 10.1074/jbc.m110.150342] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have previously reported that thrombin-activatable fibrinolysis inhibitor (TAFI) exhibits intrinsic proteolytic activity toward large peptides. The structural basis for this observation was clarified by the crystal structures of human and bovine TAFI. These structures evinced a significant rotation of the pro-domain away from the catalytic moiety when compared with other pro-carboxypeptidases, thus enabling access of large peptide substrates to the active site cleft. Here, we further investigated the flexible nature of the pro-domain and demonstrated that TAFI forms productive complexes with protein carboxypeptidase inhibitors from potato, leech, and tick (PCI, LCI, and TCI, respectively). We determined the crystal structure of the bovine TAFI-TCI complex, revealing that the pro-domain was completely displaced from the position observed in the TAFI structure. It protruded into the bulk solvent and was disordered, whereas TCI occupied the position previously held by the pro-domain. The authentic nature of the presently studied TAFI-inhibitor complexes was supported by the trimming of the C-terminal residues from the three inhibitors upon complex formation. This finding suggests that the inhibitors interact with the active site of TAFI in a substrate-like manner. Taken together, these data show for the first time that TAFI is able to form a bona fide complex with protein carboxypeptidase inhibitors. This underlines the unusually flexible nature of the pro-domain and implies a possible mechanism for regulation of TAFI intrinsic proteolytic activity in vivo.
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Affiliation(s)
- Zuzana Valnickova
- Center for Insoluble Protein Structure (inSPIN), Department of Molecular Biology, Science Park, Aarhus University, Gustav Wieds Vej 10C, DK-8000 Aarhus C, Denmark
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22
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Tanco S, Arolas JL, Guevara T, Lorenzo J, Avilés FX, Gomis-Rüth FX. Structure-function analysis of the short splicing variant carboxypeptidase encoded by Drosophila melanogaster silver. J Mol Biol 2010; 401:465-77. [PMID: 20600119 PMCID: PMC7089606 DOI: 10.1016/j.jmb.2010.06.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 06/16/2010] [Accepted: 06/17/2010] [Indexed: 11/30/2022]
Abstract
Drosophila melanogaster silver gene is the ortholog of the coding gene of mammalian carboxypeptidase D (CPD). The silver gene gives rise to eight different splicing variants of differing length that can contain up to three homologous repeats. Among the protein variants encoded, the short form 1B alias DmCPD1Bs (D. melanogaster CPD variant 1B short) is necessary and sufficient for viability of the fruit fly. It has one single repeat, it is active against standard peptide substrates, and it is localized to the secretory pathway. In this work, the enzyme was found as a monomer in solution and as a homodimer in the crystal structure, which features a protomer with an N-terminal 311-residue catalytic domain of α/β-hydrolase fold and a C-terminal 84-residue all-β transthyretin-like domain. Overall, DmCPD1Bs conforms to the structure of N/E-type funnelins/M14B metallopeptidases, but it has two unique structural elements potentially involved in regulation of its activity: (i) two contiguous surface cysteines that may become palmitoylated and target the enzyme to membranes, thus providing control through localization, and (ii) a surface hot spot targetable by peptidases that would provide a regulatory mechanism through proteolytic inactivation. Given that the fruit fly possesses orthologs of only two out of the five proteolytically competent N/E-type funnelins found in higher vertebrates, DmCPD1Bs may represent a functional analog of at least one of the missing mammalian CPs.
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Affiliation(s)
- Sebastián Tanco
- Departament de Bioquímica i Biologia Molecular, Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain
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Sanglas L, Arolas JL, Valnickova Z, Aviles FX, Enghild JJ, Gomis-Rüth FX. Insights into the molecular inactivation mechanism of human activated thrombin-activatable fibrinolysis inhibitor. J Thromb Haemost 2010; 8:1056-65. [PMID: 20088943 DOI: 10.1111/j.1538-7836.2010.03740.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
SUMMARY BACKGROUND Thrombin-activatable fibrinolysis inhibitor (TAFI) is a validated target for thrombotic diseases. TAFI is converted in vivo to activated TAFI (TAFIa) by removal of its pro-domain. Whereas TAFI is stable and persists in the circulation, possibly in complex with plasminogen, TAFIa is unstable and poorly soluble, with a half-life of minutes. OBJECTIVES In order to study the molecular determinants of this instability, we studied the influence of protein inhibitors on human TAFIa. RESULTS We found that protein inhibitors significantly reduced the instability and insolubility of TAFIa. In addition, we solved the 2.5-A resolution crystal structure of human TAFIa in complex with a potent protein inhibitor, tick-derived carboxypeptidase inhibitor, which gives rise to a stable and soluble TAFIa species. The structure revealed a significant reduction in the flexibility of dynamic segments when compared with the structures of bovine and human TAFI. We also identified two latent hotspots, loop Lbeta2beta3 and segment alpha5-Lalpha5beta7-beta7, where conformational destabilization may begin. These hotspots are also present in TAFI, but the pro-domain may provide sufficient stabilization and solubility to guarantee protein persistence in vivo. When the pro-domain is removed, the free TAFIa moiety becomes unstable, its activity is suppressed, and the molecule becomes insoluble. CONCLUSIONS The present study corroborates the function of protein inhibitors in stabilizing human TAFIa and it provides a rigid and high-resolution mold for the design of small molecule inhibitors of this enzyme, thus paving the way for novel therapy for thrombotic disorders.
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Affiliation(s)
- L Sanglas
- Departament de Bioquímica i Biologia Molecular, Facultat de Ciències, Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, Spain
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Pantoja-Uceda D, Arolas JL, Aviles FX, Santoro J, Ventura S, Sommerhoff CP. Deciphering the structural basis that guides the oxidative folding of leech-derived tryptase inhibitor. J Biol Chem 2010; 284:35612-20. [PMID: 19820233 DOI: 10.1074/jbc.m109.061077] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein folding mechanisms have remained elusive mainly because of the transient nature of intermediates. Leech-derived tryptase inhibitor (LDTI) is a Kazal-type serine proteinase inhibitor that is emerging as an attractive model for folding studies. It comprises 46 amino acid residues with three disulfide bonds, with one located inside a small triple-stranded antiparallel beta-sheet and with two involved in a cystine-stabilized alpha-helix, a motif that is widely distributed in bioactive peptides. Here, we analyzed the oxidative folding and reductive unfolding of LDTI by chromatographic and disulfide analyses of acid-trapped intermediates. It folds and unfolds, respectively, via sequential oxidation and reduction of the cysteine residues that give rise to a few 1- and 2-disulfide intermediates. Species containing two native disulfide bonds predominate during LDTI folding (IIa and IIc) and unfolding (IIa and IIb). Stop/go folding experiments demonstrate that only intermediate IIa is productive and oxidizes directly into the native form. The NMR structures of acid-trapped and further isolated IIa, IIb, and IIc reveal global folds similar to that of the native protein, including a native-like canonical inhibitory loop. Enzyme kinetics shows that both IIa and IIc are inhibitory-active, which may substantially reduce proteolysis of LDTI during its folding process. The results reported show that the kinetics of the folding reaction is modulated by the specific structural properties of the intermediates and together provide insights into the interdependence of conformational folding and the assembly of native disulfides during oxidative folding.
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Affiliation(s)
- David Pantoja-Uceda
- Departamento de Espectroscopía y Estructura Molecular, Instituto de Química Física Rocasolano, Consejo Superior de Investigaciones Científicas, Serrano 119, E-28006 Madrid, Spain
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Arolas JL, Castillo V, Bronsoms S, Aviles FX, Ventura S. Designing Out Disulfide Bonds of Leech Carboxypeptidase Inhibitor: Implications for Its Folding, Stability and Function. J Mol Biol 2009; 392:529-46. [DOI: 10.1016/j.jmb.2009.06.049] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Revised: 05/04/2009] [Accepted: 06/18/2009] [Indexed: 11/26/2022]
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Arolas JL, Sanglas L, Lorenzo J, Bronsoms S, Aviles FX. Insights into the Two-Domain Architecture of the Metallocarboxypeptidase Inhibitor from the Ascaris Parasite Inferred from the Mechanism of Its Oxidative Folding. Biochemistry 2009; 48:8225-32. [DOI: 10.1021/bi901147g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joan L. Arolas
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
| | - Laura Sanglas
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
| | - Julia Lorenzo
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
| | - Sílvia Bronsoms
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
| | - Francesc X. Aviles
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
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Parajó Y, Arolas JL, Moreno V, Sánchez-González Á, Sordo J, de Llorens R, Avilés FX, Lorenzo J. Cytotoxicity studies of [PtCl2(H2bim)] (H2bim=2,2′-biimidazole): Study of its interaction with a small protein PCI (potato carboxypeptidase inhibitor). Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Arolas JL, Pantoja-Uceda D, Ventura S, Blanco FJ, Aviles FX. The NMR Structures of the Major Intermediates of the Two-domain Tick Carboxypeptidase Inhibitor Reveal Symmetry in Its Folding and Unfolding Pathways. J Biol Chem 2008; 283:27110-20. [DOI: 10.1074/jbc.m803978200] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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Pantoja-Uceda D, Arolas JL, García P, López-Hernández E, Padró D, Aviles FX, Blanco FJ. The NMR Structure and Dynamics of the Two-Domain Tick Carboxypeptidase Inhibitor Reveal Flexibility in Its Free Form and Stiffness upon Binding to Human Carboxypeptidase B. Biochemistry 2008; 47:7066-78. [DOI: 10.1021/bi800403m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David Pantoja-Uceda
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
| | - Joan L. Arolas
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
| | - Pascal García
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
| | - Eva López-Hernández
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
| | - Daniel Padró
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
| | - Francesc X. Aviles
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
| | - Francisco J. Blanco
- Instituto de Química-Física Rocasolano, CSIC, Serrano 119, 28006 Madrid, Spain, NMR Group, Structural Biology and Biocomputing Programme, Centro Nacional de Investigaciones Oncológicas, CNIO, Melchor Fernández Almagro 3, 28029 Madrid, Spain, Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, and Structural Biology Unit, CIC bioGUNE, Parque Tecnológico de Bizkaia, Edificio 800, 48160 Derio, Spain
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Arias-Moreno X, Arolas JL, Aviles FX, Sancho J, Ventura S. Scrambled isomers as key intermediates in the oxidative folding of ligand binding module 5 of the low density lipoprotein receptor. J Biol Chem 2008; 283:13627-37. [PMID: 18343813 DOI: 10.1074/jbc.m800755200] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The ligand binding module five (LA5) of the low density lipoprotein receptor is a small, single-domain protein of 40 residues and three disulfide bonds with a calcium binding motif that is essential for its structure and function. Several mutations in LA5 have been reported to cause familial hypercholesterolemia by impairing a proper folding of the module. The current study reports the oxidative folding and reductive unfolding pathways of wild type and mutant LA5 modules through kinetic and structural analysis of the trapped intermediates. Wild type LA5 folding involves an initial phase of nonspecific packing where the sequential oxidation of its cysteines gives rise to complex equilibrated populations of intermediates. In the presence of calcium, the attainment of a coordination-competent conformation becomes the rate-limiting step of folding while binding of the ion funnels both thermodynamically and kinetically the folding reaction toward the native state. In the absence of calcium, a scrambled isomer (termed Xa) constitutes the global free energy minimum of the folding process. Xa and the native form are stable, inter-convertible species whose relative populations at equilibrium appear displaced in disease-linked mutants toward the scrambled form. Because stable scrambled isomers such as Xa avoid the exposition of reactive cysteines in misfolded modules, they might constitute a strategy to prevent wrong interactions with other domains during folding of the receptor. Comparison of the folding pathways of wild type and mutant LA5 provides the molecular basis to understand how LA modules fold into a functional conformation or upon mutation misfold and lead to disease.
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Affiliation(s)
- Xabier Arias-Moreno
- Institute for Biocomputation and Physics of Complex Systems, Departamento de Bioquímica y Biología Molecular y Celular, Universidad de Zaragoza, E-50009 Zaragoza, Spain
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Arolas JL, Bronsoms S, Aviles FX, Ventura S, Sommerhoff CP. Oxidative folding of leech-derived tryptase inhibitor via native disulfide-bonded intermediates. Antioxid Redox Signal 2008; 10:77-85. [PMID: 18004973 DOI: 10.1089/ars.2007.1850] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Leech-derived tryptase inhibitor (LDTI), comprising 46 residues and a fold stabilized by three disulfide bonds, is the only protein known to inhibit human beta-tryptase with high affinity. The present work examines its oxidative folding and reductive unfolding with chromatographic and disulfide analysis of the trapped intermediates. LDTI folds and unfolds through a sequential oxidation of its cysteine residues that give rise to the accumulation of a few one- and two-disulfide intermediates. Three species containing two native disulfide bonds (IIa, IIb, and IIc) are detected in LDTI folding, but only one (IIb) seems to be productive and oxidizes into the native structure. Stop/go experiments indicate that the intermediates IIa and IIc must reduce or rearrange their disulfide bonds to reach the productive route. The acquisition of the native structure is extremely fast and efficient, probably influenced by the low levels of non-native three-disulfide (scrambled) isomers occurring along the reaction. Finally, the Cys14-Cys40 disulfide bond, buried in native LDTI and formed in IIa and IIb intermediates, appears to be a key factor for both the initiation of folding and the stability of this molecule. Together, the derived data provide a molecular basis for development of new LDTI variants with altered properties.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i Biomedicina, Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, Barcelona, Spain
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Abstract
Metallocarboxypeptidases (MCPs) are commonly regarded as exopeptidases that actively participate in the digestion of proteins and peptides. In the recent years, however, novel MCPs comprising a wide range of physiological roles have been found in different mammalian extra-pancreatic tissues and fluids. Among them, CPU, also known as thrombin-activatable fibrinolysis inhibitor (TAFI), has been shown to cleave C-terminal Lys residues from partially degraded fibrin, acting as inhibitor of clot fibrinolysis and therefore constituting an important drug target for thrombolytic therapies. Other MCPs such as CPE, CPN, CPM, and CPD function as pro-hormone and neuropeptide processors and display several structural differences with the pancreatic-like enzymes. In addition, important advances have been made in the discovery and characterization of new endogenous and exogenous proteinaceous inhibitors; the structural determination of their complexes with several MCPs has revealed novel binding modes. Finally, the use of MCPs in antibody-directed enzyme pro-drug therapy (ADEPT) has proved to be an efficient approach for the delivery of lethal levels of chemotherapeutic drugs specifically at tumor tissues. Taken together, these recent developments may help to understand potential biomedical implications of MCPs. Future perspectives for the regulation of these enzymes through the use of more selective and potent inhibitors are also discussed in this review and combined with earlier observations in the field.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i Biomedicina and Dept. de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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Arolas JL, Bronsoms S, Ventura S, Aviles FX, Calvete JJ. Characterizing the tick carboxypeptidase inhibitor: molecular basis for its two-domain nature. J Biol Chem 2006; 281:22906-16. [PMID: 16760476 DOI: 10.1074/jbc.m602301200] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tick carboxypeptidase inhibitor (TCI) is a small, disulfide-rich protein that selectively inhibits metallocarboxypeptidases and strongly accelerates the fibrinolysis of blood clots. TCI consists of two domains that are structurally very similar, each containing three disulfide bonds arranged in an almost identical fashion. The oxidative folding and reductive unfolding pathways of TCI and its separated domains have been characterized by kinetic and structural analysis of the acid-trapped folding intermediates. TCI folding proceeds through a sequential formation of 1-, 2-, 3-, 4-, 5-, and 6-disulfide species to reach the native form. Folding intermediates of TCI comprise two predominant 3-disulfide species (named IIIa and IIIb) and a major 6-disulfide scrambled isomer (Xa) that consecutively accumulate along the reaction and are strongly prevented by the presence of protein disulfide isomerase. This study demonstrates that IIIa and IIIb are 3-disulfide species containing the native disulfide pairings of the N- and C-terminal domains of TCI, respectively, and explains why the two domains of TCI fold sequentially and independently. Also, we show that the reductive unfolding of TCI undergoes two main independent unfolding events through the formation of IIIa and IIIb intermediates. Together, the comparison of the folding, stability, and inhibitory activity of TCI with those of the isolated domains reveals the reasons behind the two-domain nature of this protein: both domains contribute to the specificity and high affinity of its double-headed binding to carboxypeptidases. The results obtained herein provide valuable information for the design of more potent and selective TCI molecules.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona
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Arolas JL, Aviles FX, Chang JY, Ventura S. Folding of small disulfide-rich proteins: clarifying the puzzle. Trends Biochem Sci 2006; 31:292-301. [PMID: 16600598 DOI: 10.1016/j.tibs.2006.03.005] [Citation(s) in RCA: 124] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2006] [Revised: 02/20/2006] [Accepted: 03/22/2006] [Indexed: 11/21/2022]
Abstract
The process by which small proteins fold to their native conformations has been intensively studied over the past few decades. The particular chemistry of disulfide-bond formation has facilitated the characterization of the oxidative folding of numerous small, disulfide-rich proteins with results that illustrate a high level of diversity in folding mechanisms, differing in the heterogeneity and native disulfide-bond content of their intermediates. Information from folding studies of these proteins, together with the recent structural determinations of predominant intermediates, has provided new molecular insights into oxidative folding and clarifies the major rules that govern it.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona; 08193 Bellaterra, Barcelona, Spain
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Arolas JL, Popowicz GM, Bronsoms S, Aviles FX, Huber R, Holak TA, Ventura S. Study of a Major Intermediate in the Oxidative Folding of Leech Carboxypeptidase Inhibitor: Contribution of the Fourth Disulfide Bond. J Mol Biol 2005; 352:961-75. [PMID: 16126224 DOI: 10.1016/j.jmb.2005.07.065] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2005] [Revised: 07/18/2005] [Accepted: 07/26/2005] [Indexed: 10/25/2022]
Abstract
The oxidative folding pathway of leech carboxypeptidase inhibitor (LCI; four disulfide bonds) proceeds through the formation of two major intermediates (III-A and III-B) that contain three native disulfide bonds and act as strong kinetic traps in the folding process. The III-B intermediate lacks the Cys19-Cys43 disulfide bond that links the beta-sheet core with the alpha-helix in wild-type LCI. Here, an analog of this intermediate was constructed by replacing Cys19 and Cys43 with alanine residues. Its oxidative folding follows a rapid sequential flow through one, two, and three disulfide species to reach the native form; the low accumulation of two disulfide intermediates and three disulfide (scrambled) isomers accounts for a highly efficient reaction. The three-dimensional structure of this analog, alone and in complex with carboxypeptidase A (CPA), was determined by X-ray crystallography at 2.2A resolution. Its overall structure is very similar to that of wild-type LCI, although the residues in the region adjacent to the mutation sites show an increased flexibility, which is strongly reduced upon binding to CPA. The structure of the complex also demonstrates that the analog and the wild-type LCI bind to the enzyme in the same manner, as expected by their inhibitory capabilities, which were similar for all enzymes tested. Equilibrium unfolding experiments showed that this mutant is destabilized by approximately 1.5 kcal mol(-1) (40%) relative to the wild-type protein. Together, the data indicate that the fourth disulfide bond provides LCI with both high stability and structural specificity.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
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Arolas JL, D'Silva L, Popowicz GM, Aviles FX, Holak TA, Ventura S. NMR Structural Characterization and Computational Predictions of the Major Intermediate in Oxidative Folding of Leech Carboxypeptidase Inhibitor. Structure 2005; 13:1193-202. [PMID: 16084391 DOI: 10.1016/j.str.2005.05.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2005] [Revised: 04/19/2005] [Accepted: 05/06/2005] [Indexed: 11/30/2022]
Abstract
The III-A intermediate constitutes the major rate-determining step in the oxidative folding of leech carboxypeptidase inhibitor (LCI). In this work, III-A has been directly purified from the folding reaction and structurally characterized by NMR spectroscopy. This species, containing three native disulfides, displays a highly native-like structure; however, it lacks some secondary structure elements, making it more flexible than native LCI. III-A represents a structurally determined example of a disulfide-insecure intermediate; direct oxidation of this species to the fully native protein seems to be restricted by the burial of its two free cysteine residues inside a native-like structure. We also show that theoretical approaches based on topological constraints predict with good accuracy the presence of this folding intermediate. Overall, the derived results suggest that, as it occurs with non-disulfide bonded proteins, native-like interactions between segments of secondary structure rather than the crosslinking of disulfide bonds direct the folding of LCI.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
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Arolas JL, Popowicz GM, Lorenzo J, Sommerhoff CP, Huber R, Aviles FX, Holak TA. The Three-Dimensional Structures of Tick Carboxypeptidase Inhibitor in Complex with A/B Carboxypeptidases Reveal a Novel Double-headed Binding Mode. J Mol Biol 2005; 350:489-98. [PMID: 15961103 DOI: 10.1016/j.jmb.2005.05.015] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2005] [Revised: 05/06/2005] [Accepted: 05/08/2005] [Indexed: 11/28/2022]
Abstract
The tick carboxypeptidase inhibitor (TCI) is a proteinaceous inhibitor of metallo-carboxypeptidases present in the blood-sucking tick Rhipicephalus bursa. The three-dimensional crystal structures of recombinant TCI bound to bovine carboxypeptidase A and to human carboxypeptidase B have been determined and refined at 1.7 A and at 2.0 A resolution, respectively. TCI consists of two domains that are structurally similar despite the low degree of sequence homology. The domains, each consisting of a short alpha-helix followed by a small twisted antiparallel beta-sheet, show a high level of structural homology to proteins of the beta-defensin-fold family. TCI anchors to the surface of mammalian carboxypeptidases in a double-headed manner not previously seen for carboxypeptidase inhibitors: the last three carboxy-terminal amino acid residues interact with the active site of the enzyme in a way that mimics substrate binding, and the N-terminal domain binds to an exosite distinct from the active-site groove. The structures of these complexes should prove valuable in the applications of TCI as a thrombolytic drug and as a basis for the design of novel bivalent carboxypeptidase inhibitors.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
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Arolas JL, Lorenzo J, Rovira A, Castellà J, Aviles FX, Sommerhoff CP. A carboxypeptidase inhibitor from the tick Rhipicephalus bursa: isolation, cDNA cloning, recombinant expression, and characterization. J Biol Chem 2004; 280:3441-8. [PMID: 15561703 DOI: 10.1074/jbc.m411086200] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A novel proteinaceous metallo-carboxypeptidase inhibitor, named tick carboxypeptidase inhibitor (TCI), was isolated from the ixodid tick Rhipicephalus bursa and N-terminally sequenced. The complete cDNA encoding this protein was cloned from tick mRNA by reverse transcription-PCR and rapid amplification of cDNA ends techniques. The full-length TCI cDNA contains an open reading frame coding for a precursor protein of 97 amino acid residues that consists of a predicted signal peptide of 22 residues and of mature TCI, a 75-residue cysteine-rich protein (12 Cys). The deduced amino acid sequence shows no homology to other known proteins; the C terminus, however, resembles those of other protein metallo-carboxypeptidase inhibitors, suggesting a common mechanism of inhibition. Recombinant TCI expressed in Escherichia coli is fully functional and inhibits carboxypeptidases of the A/B subfamily with equilibrium dissociation constants in the nanomolar range. Structural analyses by circular dichroism and nuclear magnetic resonance indicate that TCI is a protein strongly constrained by disulfide bonds, unusually stable over a wide pH range and highly resistant to denaturing conditions. As a tight binding inhibitor of plasma carboxypeptidase B, also known as thrombin-activatable fibrinolysis inhibitor, recombinant TCI stimulates fibrinolysis in vitro and thus may have potential for applications to prevent or treat thrombotic disorders.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i de Biomedicina and Departament de Sanitat i d'Anatomia Animals, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
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Arolas JL, Bronsoms S, Lorenzo J, Aviles FX, Chang JY, Ventura S. Role of kinetic intermediates in the folding of leech carboxypeptidase inhibitor. J Biol Chem 2004; 279:37261-70. [PMID: 15226306 DOI: 10.1074/jbc.m405565200] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The oxidative folding and reductive unfolding pathways of leech carboxypeptidase inhibitor (LCI; four disulfides) have been characterized in this work by structural and kinetic analysis of the acid-trapped folding intermediates. The oxidative folding of reduced and denatured LCI proceeds rapidly through a sequential flow of 1-, 2-, 3-, and 4-disulfide (scrambled) species to reach the native form. Folding intermediates of LCI comprise two predominant 3-disulfide species (designated as III-A and III-B) and a heterogeneous population of scrambled isomers that consecutively accumulate along the folding reaction. Our study reveals that forms III-A and III-B exclusively contain native disulfide bonds and correspond to stable and partially structured species that interconvert, reaching an equilibrium prior to the formation of the scrambled isomers. Given that these intermediates act as kinetic traps during the oxidative folding, their accumulation is prevented when they are destabilized, thus leading to a significant acceleration of the folding kinetics. III-A and III-B forms appear to have both native disulfides bonds and free thiols similarly protected from the solvent; major structural rearrangements through the formation of scrambled isomers are required to render native LCI. The reductive unfolding pathway of LCI undergoes an apparent all-or-none mechanism, although low amounts of intermediates III-A and III-B can be detected, suggesting differences in protection against reduction among the disulfide bonds. The characterization of III-A and III-B forms shows that the former intermediate structurally and functionally resembles native LCI, whereas the III-B form bears more resemblance to scrambled isomers.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
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Arolas JL, Lorenzo J, Rovira A, Vendrell J, Aviles FX, Ventura S. Secondary Binding Site of the Potato Carboxypeptidase Inhibitor. Contribution to Its Structure, Folding, and Biological Properties. Biochemistry 2004; 43:7973-82. [PMID: 15196042 DOI: 10.1021/bi049596j] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The contribution of each residue of the potato carboxypeptidase inhibitor (PCI) secondary binding site to the overall properties of this protein has been examined using alanine-scanning mutagenesis. Structural and enzymatic studies, performed on a series of PCI mutants, demonstrate that the proper positioning of the primary site for efficient binding and inhibition of carboxypeptidase A is significantly dependent on such a secondary contact region. The aromatic residues in this region play a key role in the stabilization of the PCI-enzyme complex, whereas polar residues contribute little to this task. A comparative study of the oxidative folding of these PCI mutants has been carried out using the disulfide quenching approach. The data, together with the structural characterization of some of these mutants, clearly indicate that noncovalent forces drive the refolding of this small disulfide-rich protein at the reshuffling stage, the rate-limiting step of the process. Moreover, it reveals that by introducing new noncovalent intramolecular contacts in PCI, we may create more stable variants, which also show improved folding efficiency. Taken together, the collected results clarify the folding determinants of the primary and secondary binding sites of PCI and their contribution to the inhibition of the carboxypeptidase, providing clues about PCI evolution and knowledge for its biotechnological redesign.
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Affiliation(s)
- Joan L Arolas
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autonoma de Barcelona, 08193 Bellaterra, Spain
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