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Dominguez-Molina L, Kurata T, Cepauskas A, Echemendia-Blanco D, Zedek S, Talavera-Perez A, Atkinson GC, Hauryliuk V, Garcia-Pino A. Mechanisms of neutralization of toxSAS from toxin-antitoxin modules. Nat Chem Biol 2024:10.1038/s41589-024-01630-4. [PMID: 38834893 DOI: 10.1038/s41589-024-01630-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 04/22/2024] [Indexed: 06/06/2024]
Abstract
Toxic small alarmone synthetase (toxSAS) enzymes constitute a family of bacterial effectors present in toxin-antitoxin and secretion systems. toxSASs act through either translation inhibition mediated by pyrophosphorylation of transfer RNA (tRNA) CCA ends or synthesis of the toxic alarmone adenosine pentaphosphate ((pp)pApp) and adenosine triphosphate (ATP) depletion, exemplified by FaRel2 and FaRel, respectively. However, structural bases of toxSAS neutralization are missing. Here we show that the pseudo-Zn2+ finger domain (pZFD) of the ATfaRel2 antitoxin precludes access of ATP to the pyrophosphate donor site of the FaRel2 toxin, without affecting recruitment of the tRNA pyrophosphate acceptor. By contrast, (pp)pApp-producing toxSASs are inhibited by Tis1 antitoxin domains though occlusion of the pyrophosphate acceptor-binding site. Consequently, the auxiliary pZFD of AT2faRel is dispensable for FaRel neutralization. Collectively, our study establishes the general principles of toxSAS inhibition by structured antitoxin domains, with the control strategy directly coupled to toxSAS substrate specificity.
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Affiliation(s)
- Lucia Dominguez-Molina
- Cellular and Molecular Microbiology, Faculté des Sciences, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Tatsuaki Kurata
- Department of Experimental Medical Science, Lund University, Lund, Sweden
| | - Albinas Cepauskas
- Cellular and Molecular Microbiology, Faculté des Sciences, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Dannele Echemendia-Blanco
- Cellular and Molecular Microbiology, Faculté des Sciences, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Safia Zedek
- Cellular and Molecular Microbiology, Faculté des Sciences, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Ariel Talavera-Perez
- Cellular and Molecular Microbiology, Faculté des Sciences, Université libre de Bruxelles (ULB), Brussels, Belgium
| | - Gemma C Atkinson
- Department of Experimental Medical Science, Lund University, Lund, Sweden.
| | - Vasili Hauryliuk
- Department of Experimental Medical Science, Lund University, Lund, Sweden.
- Faculty of Science and Technology, University of Tartu Institute of Technology, Tartu, Estonia.
- Science for Life Laboratory, Lund, Sweden.
| | - Abel Garcia-Pino
- Cellular and Molecular Microbiology, Faculté des Sciences, Université libre de Bruxelles (ULB), Brussels, Belgium.
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2
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Pacheco JS, Teixeira ÉMGF, Paschoal RG, Torres-Santos EC, Simone SGDE, Silva-López REDA. Antileishmanial effects of Crotalaria spectabilis Roth aqueous extracts on Leishmania amazonensis. AN ACAD BRAS CIENC 2023; 95:e20220613. [PMID: 37672397 DOI: 10.1590/0001-3765202320220613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 02/22/2023] [Indexed: 09/08/2023] Open
Abstract
Fifteen polar extracts from leaf, seed, pod, stem, flower and root of Crotalaria spectabilis were prepared using aqueous systems, based on the principles of green chemistry, and showed different protease inhibitor (PI) activities on trypsin, papain, pepsin and the extracellular L. amazonensis serine protease (LSPIII). The most pronounced inhibitory effect on LSPIII was observed in leaf (CS-P), root, stem, flower (CS-FPVPP) and pod (CS-VA) extracts. Crotalaria extracts exhibited low cytotoxicity on macrophages; however, they decreased the viability of L. amazonensis promastigotes and amastigotes, as observed in leaf (CS-AE, CS-P, CS-T and CS-PVPP), seed (CS-ST), flower and root (CS-RA) extracts. CS-P was chosen to study PI and secondary metabolites and a 10-12 kDa protein, analyzed by mass spectrometry, was identified as a serine PI homologous with papaya latex serine PI. Glycosylated flavonoids, such as quercetins, vitexin and tricin were the major secondary metabolites of CS-P. The presence of PIs in C. spectabilis is a new finding, especially in other organs than seeds since PIs have been reported only in seed legumes. Besides, this is the first report of antileishmanial activity of C. spectabilis extracts and the identification of serine polypeptide PI and glycosylated flavonoids from leaf.
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Affiliation(s)
- Juliana S Pacheco
- FIOCRUZ, Departamento de Produtos Naturais, Avenida Brasil, 4365, Farmanguinhos, 21040-900 Rio de Janeiro, RJ, Brazil
- University of Dundee, School of Life Sciences, Division of Biological Chemistry and Drug Discovery, Nethergate, Dundee, DD1 4HN, Scotland, United Kingdom
| | - Érika Maria G F Teixeira
- FIOCRUZ, Departamento de Produtos Naturais, Avenida Brasil, 4365, Farmanguinhos, 21040-900 Rio de Janeiro, RJ, Brazil
| | - Ramon G Paschoal
- FIOCRUZ, Departamento de Produtos Naturais, Avenida Brasil, 4365, Farmanguinhos, 21040-900 Rio de Janeiro, RJ, Brazil
| | - Eduardo Caio Torres-Santos
- FIOCRUZ, Instituto Oswaldo Cruz, Laboratório de Bioquímica de Tripanossomatídeos, Avenida Brasil, 4365, 21040-900 Rio de Janeiro, RJ, Brazil
| | - Salvatore Giovanni DE Simone
- FIOCRUZ, Centro de Desenvolvimento Tecnológico em Saúde (CDTS), Instituto Nacional de Ciências e Tecnologia para Inovação em Doenças Negligenciadas (INCT-IDN), Avenida Brasil, 4365, 21040-900 Rio de Janeiro, RJ, Brazil
| | - Raquel Elisa DA Silva-López
- FIOCRUZ, Departamento de Produtos Naturais, Avenida Brasil, 4365, Farmanguinhos, 21040-900 Rio de Janeiro, RJ, Brazil
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3
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Guerra Y, Armijos‐Jaramillo V, Pons T, Tejera E, Berry C. Canonical or noncanonical? Structural plasticity of serine protease-binding loops in Kunitz-STI protease inhibitors. Protein Sci 2023; 32:e4570. [PMID: 36660780 PMCID: PMC9885459 DOI: 10.1002/pro.4570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 12/08/2022] [Accepted: 01/13/2023] [Indexed: 01/21/2023]
Abstract
The Kunitz-Soybean Trypsin Inhibitor (Kunitz-STI) family is a large family of proteins with most of its members being protease inhibitors. The versatility of the inhibitory profile and the structural plasticity of these proteins, make this family a promising scaffold for designing new multifunctional proteins. Historically, Kunitz-STI inhibitors have been classified as canonical serine protease inhibitors, but new inhibitors with novel inhibition mechanisms have been described in recent years. Different inhibition mechanisms could be the result of different evolutionary pathways. In the present work, we performed a structural analysis of all the crystallographic structures available for Kunitz-STI inhibitors to characterize serine protease-binding loop structural features and locations. Our study suggests a relationship between the conformation of serine protease-binding loops and the inhibition mechanism, their location in the β-trefoil fold, and the plant source of the inhibitors. The classical canonical inhibitors of this family are restricted to plants from the Fabales order and bind their targets via the β4-β5 loop, whereas serine protease-binding loops in inhibitors from other plants lie mainly in the β5-β6 and β9-β10 loops. In addition, we found that the β5-β6 loop is used to inhibit two different families of serine proteases through a steric blockade inhibition mechanism. This work will help to change the general perception that all Kunitz-STI inhibitors are canonical inhibitors and proteins with protease-binding loops adopting noncanonical conformations are exceptions. Additionally, our results will help in the identification of protease-binding loops in uncharacterized or newly discovered inhibitors, and in the design of multifunctional proteins.
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Affiliation(s)
- Yasel Guerra
- Ingeniería en Biotecnología, Facultad de Ingeniería y Ciencias AplicadasUniversidad de Las AméricasQuitoEcuador
- Grupo de Bio‐QuimioinformáticaUniversidad de Las AméricasQuitoEcuador
| | - Vinicio Armijos‐Jaramillo
- Ingeniería en Biotecnología, Facultad de Ingeniería y Ciencias AplicadasUniversidad de Las AméricasQuitoEcuador
- Grupo de Bio‐QuimioinformáticaUniversidad de Las AméricasQuitoEcuador
| | - Tirso Pons
- Department of Immunology and OncologyNational Centre for Biotechnology (CNB‐CSIC)MadridSpain
| | - Eduardo Tejera
- Ingeniería en Biotecnología, Facultad de Ingeniería y Ciencias AplicadasUniversidad de Las AméricasQuitoEcuador
- Grupo de Bio‐QuimioinformáticaUniversidad de Las AméricasQuitoEcuador
| | - Colin Berry
- Cardiff School of BiosciencesCardiff UniversityCardiffUK
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4
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Garay YC, Cejas RB, Lorenz V, Zlocowski N, Parodi P, Ferrero FA, Angeloni G, García VA, Sendra VG, Lardone RD, Irazoqui FJ. Polypeptide N-acetylgalactosamine transferase 3: a post-translational writer on human health. J Mol Med (Berl) 2022; 100:1387-1403. [PMID: 36056254 DOI: 10.1007/s00109-022-02249-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Revised: 08/10/2022] [Accepted: 08/17/2022] [Indexed: 10/14/2022]
Abstract
Polypeptide N-acetylgalactosamine transferase 3 (ppGalNAc-T3) is an enzyme involved in the initiation of O-GalNAc glycan biosynthesis. Acting as a writer of frequent post-translational modification (PTM) on human proteins, ppGalNAc-T3 has key functions in the homeostasis of human cells and tissues. We review the relevant roles of this molecule in the biosynthesis of O-GalNAc glycans, as well as in biological functions related to human physiological and pathological conditions. With main emphasis in ppGalNAc-T3, we draw attention to the different ways involved in the modulation of ppGalNAc-Ts enzymatic activity. In addition, we take notice on recent reports of ppGalNAc-T3 having different subcellular localizations, highlight critical intrinsic and extrinsic functions in cellular physiology that are exerted by ppGalNAc-T3-synthesized PTMs, and provide an update on several human pathologies associated with dysfunctional ppGalNAc-T3. Finally, we propose biotechnological tools as new therapeutic options for the treatment of pathologies related to altered ppGalNAc-T3. KEY MESSAGES: ppGalNAc-T3 is a key enzyme in the human O-GalNAc glycans biosynthesis. enzyme activity is regulated by PTMs, lectin domain and protein-protein interactions. ppGalNAc-T3 is located in human Golgi apparatus and cell nucleus. ppGalNAc-T3 has a central role in cell physiology as well as in several pathologies. Biotechnological tools for pathological management are proposed.
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Affiliation(s)
- Yohana Camila Garay
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Romina Beatriz Cejas
- Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, USA
| | - Virginia Lorenz
- Facultad de Bioquímica Y Ciencias Biológicas, Instituto de Salud Y Ambiente del Litoral (ISAL), Universidad Nacional del Litoral (UNL) - Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Santa Fe, Argentina
| | - Natacha Zlocowski
- Centro de Microscopía Electrónica, Facultad de Ciencias Médicas, Instituto de Investigaciones en Ciencias de La Salud (INICSA-CONICET), Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Pedro Parodi
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Franco Alejandro Ferrero
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Genaro Angeloni
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Valentina Alfonso García
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Victor German Sendra
- Center for Translational Ocular Immunology, Department of Ophthalmology, Tufts Medical Center, Tufts University School of Medicine, Boston, MA, USA
| | - Ricardo Dante Lardone
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina
| | - Fernando José Irazoqui
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET and Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
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5
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Mishra M. Evolutionary Aspects of the Structural Convergence and Functional Diversification of Kunitz-Domain Inhibitors. J Mol Evol 2020; 88:537-548. [PMID: 32696206 DOI: 10.1007/s00239-020-09959-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Accepted: 07/04/2020] [Indexed: 11/28/2022]
Abstract
Kunitz-type domains are ubiquitously found in natural systems as serine protease inhibitors or animal toxins in venomous animals. Kunitz motif is a cysteine-rich peptide chain of ~ 60 amino acid residues with alpha and beta fold, stabilized by three conserved disulfide bridges. An extensive dataset of amino acid variations is found on sequence analysis of various Kunitz peptides. Kunitz peptides show diverse biological activities like inhibition of proteases of other classes and/or adopting a new function of blocking or modulating the ion channels. Based on the amino acid residues at the functional site of various Kunitz-type inhibitors, it is inferred that this 'flexibility within the structural rigidity' is responsible for multiple biological activities. Accelerated evolution of functional sites in response to the co-evolving molecular targets of the hosts of venomous animals or parasites, gene sharing, and gene duplication have been discussed as the most likely mechanisms responsible for the functional heterogeneity of Kunitz-domain inhibitors.
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Affiliation(s)
- Manasi Mishra
- Department of Life Sciences, School of Natural Sciences, Shiv Nadar University, Gautam Buddha Nagar, Uttar Pradesh, 201314, India.
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6
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Barbosa MS, da Silva Souza B, Silva Sales AC, de Sousa JDL, da Silva FDS, Araújo Mendes MG, da Costa KRL, de Oliveira TM, Daboit TC, de Oliveira JS. Antifungal Proteins from Plant Latex. Curr Protein Pept Sci 2019; 21:497-506. [PMID: 31746293 DOI: 10.2174/1389203720666191119101756] [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: 06/13/2019] [Revised: 06/26/2019] [Accepted: 11/13/2019] [Indexed: 01/29/2023]
Abstract
Latex, a milky fluid found in several plants, is widely used for many purposes, and its proteins have been investigated by researchers. Many studies have shown that latex produced by some plant species is a natural source of biologically active compounds, and many of the hydrolytic enzymes are related to health benefits. Research on the characterization and industrial and pharmaceutical utility of latex has progressed in recent years. Latex proteins are associated with plants' defense mechanisms, against attacks by fungi. In this respect, there are several biotechnological applications of antifungal proteins. Some findings reveal that antifungal proteins inhibit fungi by interrupting the synthesis of fungal cell walls or rupturing the membrane. Moreover, both phytopathogenic and clinical fungal strains are susceptible to latex proteins. The present review describes some important features of proteins isolated from plant latex which presented in vitro antifungal activities: protein classification, function, molecular weight, isoelectric point, as well as the fungal species that are inhibited by them. We also discuss their mechanisms of action.
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Affiliation(s)
- Mayck Silva Barbosa
- Laboratory of Biochemistry of Laticifer Plants, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba- PI, Brazil
| | - Bruna da Silva Souza
- Laboratory of Biochemistry of Laticifer Plants, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba- PI, Brazil
| | - Ana Clara Silva Sales
- Laboratory of Biochemistry of Laticifer Plants, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba- PI, Brazil
| | - Jhoana D'arc Lopes de Sousa
- Laboratory of Biochemistry of Laticifer Plants, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba- PI, Brazil
| | | | - Maria Gabriela Araújo Mendes
- Group of Advanced Studies in Medical Mycology, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba-PI, Brazil
| | - Káritta Raquel Lustoza da Costa
- Group of Advanced Studies in Medical Mycology, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba-PI, Brazil
| | - Taiane Maria de Oliveira
- Research Center on Biodiversity and Biotechnology, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba-PI, Brazil
| | - Tatiane Caroline Daboit
- Group of Advanced Studies in Medical Mycology, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba-PI, Brazil
| | - Jefferson Soares de Oliveira
- Laboratory of Biochemistry of Laticifer Plants, Federal University of Piaui, Campus Ministro Reis Velloso, Parnaiba- PI, Brazil
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7
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Prabahar V, Afriat-Jurnou L, Paluy I, Peleg Y, Noy D. New homologues of Brassicaceae water-soluble chlorophyll proteins shed light on chlorophyll binding, spectral tuning, and molecular evolution. FEBS J 2019; 287:991-1004. [PMID: 31549491 DOI: 10.1111/febs.15068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 08/02/2019] [Accepted: 09/18/2019] [Indexed: 01/06/2023]
Abstract
Type-II water-soluble chlorophyll (Chl) proteins (WSCPs) of Brassicaceae are promising models for understanding how protein sequence and structure affect Chl binding and spectral tuning in photosynthetic Chl-protein complexes. However, to date, their use has been limited by the small number of known WSCPs, which also limited understanding their physiological roles. To overcome these limitations, we performed a phylogenetic analysis to compile a more comprehensive and complete set of natural type-II WSCP homologues. The identified homologues were heterologously expressed in Escherichia coli, purified, tested for assembly with chlorophylls, and spectroscopically characterized. The analyses led to the discovery of previously unrecognized type-IIa and IIb subclass WSCPs, as well as of a new subclass that did not bind chlorophylls. Further analysis by ancestral sequence reconstruction yielded sequences of putative ancestors of the three subclasses, which were subsequently recombinantly expressed in E. coli, purified and characterized. Combining the phylogenetic and spectroscopic data with molecular structural information revealed distinct Chl-binding motifs, and identified residues critically impacting spectral tuning. The distinct Chl-binding properties of the WSCP archetypes suggest that the non-Chl-binding subclass evolved from a Chl-binding ancestor that most likely lost its Chl-binding capacity upon localization in the plant tissues with low Chl content. This dual evolutionary trajectory is consistent with WSCPs association with the Kunitz-type protease inhibitors superfamily, and indications of their inhibitory activity in response to various forms of stress in plants. These findings suggest new directions for exploring the physiological roles of WSCPs and the correlation, if any, between Chl-binding and protease inhibition functionality.
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Affiliation(s)
| | - Livnat Afriat-Jurnou
- Migal-Galilee Research Institute, Kiryat Shmona, Israel.,Faculty of Sciences and Technology, Tel-Hai Academic College, Upper Galilee, Israel
| | - Irina Paluy
- Migal-Galilee Research Institute, Kiryat Shmona, Israel
| | - Yoav Peleg
- Structural Proteomics Unit (SPU), Life Sciences Core Facilities, Weizmann Institute of Science, Rehovot, Israel
| | - Dror Noy
- Migal-Galilee Research Institute, Kiryat Shmona, Israel
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8
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Billinger E, Zuo S, Lundmark K, Johansson G. Light scattering determination of the stoichiometry for protease-potato serine protease inhibitor complexes. Anal Biochem 2019; 582:113357. [PMID: 31276650 DOI: 10.1016/j.ab.2019.113357] [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: 03/14/2019] [Revised: 06/30/2019] [Accepted: 07/01/2019] [Indexed: 10/26/2022]
Abstract
The interaction between pancreatic proteases and a serine protease inhibitor purified from potato tubers was investigated by chromatography-coupled light scattering measurements. The molar mass distribution in the chromatogram was compared to theoretical values calculated for the different possible combinations of complexes and free components by three different approaches, namely section analyses of the chromatograms, full mass average determination and mass distribution analysis. This revealed that the inhibitor was able to bind trypsin in a 2:1 complex, whereas the data for chymotrypsin clearly showed a limitation to 1:1 complex regardless of the molar ratio in the injected samples. The same experiment carried out with elastase and the potato inhibitor gave only weak indications of complex formation under the conditions used.
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Affiliation(s)
- Erika Billinger
- Department of Chemistry - BMC Uppsala University, Box 576, SE-751 23, Uppsala, Sweden
| | - Shusheng Zuo
- Department of Chemistry - BMC Uppsala University, Box 576, SE-751 23, Uppsala, Sweden
| | - Kristoffer Lundmark
- Department of Chemistry - BMC Uppsala University, Box 576, SE-751 23, Uppsala, Sweden
| | - Gunnar Johansson
- Department of Chemistry - BMC Uppsala University, Box 576, SE-751 23, Uppsala, Sweden.
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9
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Dib HX, de Oliveira DGL, de Oliveira CFR, Taveira GB, de Oliveira Mello E, Verbisk NV, Chang MR, Corrêa Junior D, Gomes VM, Macedo MLR. Biochemical characterization of a Kunitz inhibitor from Inga edulis seeds with antifungal activity against Candida spp. Arch Microbiol 2018; 201:223-233. [DOI: 10.1007/s00203-018-1598-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Revised: 07/03/2018] [Accepted: 11/19/2018] [Indexed: 11/25/2022]
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10
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de Oliveira CF, Oliveira CT, Taveira GB, de Oliveira Mello E, Gomes VM, Macedo MLR. Characterization of a Kunitz trypsin inhibitor from Enterolobium timbouva with activity against Candida species. Int J Biol Macromol 2018; 119:645-653. [DOI: 10.1016/j.ijbiomac.2018.07.034] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 07/09/2018] [Accepted: 07/10/2018] [Indexed: 12/15/2022]
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11
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Cai X, Xie X, Fu N, Wang S. Physico-Chemical and Antifungal Properties of a Trypsin Inhibitor from the Roots of Pseudostellaria heterophylla. Molecules 2018; 23:E2388. [PMID: 30231516 PMCID: PMC6225307 DOI: 10.3390/molecules23092388] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 09/11/2018] [Accepted: 09/14/2018] [Indexed: 02/05/2023] Open
Abstract
Plant peptidase inhibitors play essential roles in the defense systems of plants. A trypsin inhibitor (PHTI) with a molecular mass of 20.5 kDa was isolated from the fresh roots of the medicinal herb, Pseudostellaria heterophylla. The purification process involved ammonium sulfate precipitation, gel filtration chromatography on Sephadex G50, and ion-exchange chromatography on DEAE 650M. The PHTI contained 3.7% α-helix, 42.1% β-sheets, 21.2% β-turns, and 33% disordered structures, which showed similarity with several Kunitz-type trypsin inhibitors. Inhibition kinetic studies indicated that PHTI was a competitive inhibitor, with a Ki value of 3.01 × 10-9 M, indicating a high affinity to trypsin. The PHTI exhibited considerable stability over a broad range of pH (2⁻10) and temperatures (20⁻70 °C); however, metal ions, including Fe3+, Ba2+, Mn2+, and Al3+, could inactivate PHTI to different degrees. Results of fluorescence spectroscopy and circular dichroism showed that Fe3+ could bind to TI with an association constant of 2.75 × 10⁵ M-1 to form a 1:1 complex, inducing conformation changes and inactivation of PHTI. In addition, PHTI could inhibit the growth of the phytopathogens, Colletotrichum gloeosporioides and Fusarium oxysporum, through disruption of the cell membrane integrity. The present study extended research on Pseudostellaria heterophylla proteins and makes PHTI an exploitable candidate as an antifungal protein for further investigation.
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Affiliation(s)
- Xixi Cai
- The Key Lab of Analysis and Detection Technology for Food Safety of the MOE, College of Chemistry, Fuzhou University, Fuzhou 350108, China.
- Institute of Food and Marine Bio-Resources, College of Biological Science and Technology, Fuzhou University, Fuzhou 350108, China.
| | - Xiaoli Xie
- Institute of Food and Marine Bio-Resources, College of Biological Science and Technology, Fuzhou University, Fuzhou 350108, China.
| | - Nanyan Fu
- The Key Lab of Analysis and Detection Technology for Food Safety of the MOE, College of Chemistry, Fuzhou University, Fuzhou 350108, China.
| | - Shaoyun Wang
- Institute of Food and Marine Bio-Resources, College of Biological Science and Technology, Fuzhou University, Fuzhou 350108, China.
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12
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Bendre AD, Ramasamy S, Suresh CG. Analysis of Kunitz inhibitors from plants for comprehensive structural and functional insights. Int J Biol Macromol 2018; 113:933-943. [PMID: 29499268 DOI: 10.1016/j.ijbiomac.2018.02.148] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 02/21/2018] [Accepted: 02/23/2018] [Indexed: 01/11/2023]
Abstract
Legume Kunitz type trypsin inhibitor (KTI) family is one of the most versatile families of proteins. A typical KTI features a single peptide folded in β-trefoil manner, with the molecular weight about 20-22kDa and two disulphide bonds. The members are known to inhibit a wide range of serpins proteases at the same time many of them possess unique features. Copaifera langsdorffii Trypsin inhibitor (CTI) has a β-trefoil fold made up of two non-covalently bound polypeptide chains with only a single disulfide bridge. Delonix regia Trypsin inhibitor (DrTI) has one amino acid insertion between P1 and P2 of the reactive site distorting its conformation. Bauhinia bauhinioides Cruzipain inhibitor (BbCI) has a conservative β-trefoil fold but lacks disulfide bonds. Such subtle differences in structures make Kunitz inhibitors different from other inhibitor families. Most of the studies on these inhibitors are focused towards their proposed role in defense from insect pests and wounding but their exact physiological role in nature is still uncharted. Thus, it would be very interesting to closely analyze the structural details of these inhibitors in order to ascertain their biological role and other fascinating applications.
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Affiliation(s)
- Ameya D Bendre
- Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411008, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-NCL campus, Pune 411008, India
| | - Sureshkumar Ramasamy
- Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411008, India.
| | - C G Suresh
- Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Pune 411008, India
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13
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Lorenz V, Cejas RB, Bennett EP, Nores GA, Irazoqui FJ. Functional control of polypeptide GalNAc-transferase 3 through an acetylation site in the C-terminal lectin domain. Biol Chem 2017; 398:1237-1246. [PMID: 28672761 DOI: 10.1515/hsz-2017-0130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 06/21/2017] [Indexed: 11/15/2022]
Abstract
O-GalNAc glycans are important structures in cellular homeostasis. Their biosynthesis is initiated by members of the polypeptide GalNAc-transferase (ppGalNAc-T) enzyme family. Mutations in ppGalNAc-T3 isoform cause diseases (congenital disorders of glycosylation) in humans. The K626 residue located in the C-terminal β-trefoil fold of ppGalNAc-T3 was predicted to be a site with high likelihood of acetylation by CBP/p300 acetyltransferase. We used a site-directed mutagenesis approach to evaluate the role of this acetylation site in biological properties of the enzyme. Two K626 mutants of ppGalNAc-T3 (T3K626Q and T3K626A) had GalNAc-T activities lower than that of wild-type enzyme. Direct and competitive interaction assays revealed that GalNAc recognition by the lectin domain was altered in the mutants. The presence of GlcNAc glycosides affected the interaction of the three enzymes with mucin-derived peptides. In GalNAc-T activity assays, the presence of GlcNAc glycosides significantly inhibited activity of the mutant (T3K626Q) that mimicked acetylation. Our findings, taken together, reveal the crucial role of the K626 residue in the C-terminal β-trefoil fold in biological properties of human ppGalNAc-T3. We propose that acetylated residues on ppGalNAc-T3 function as control points for enzyme activity, and high level of GlcNAc glycosides promote a synergistic regulatory mechanism, leading to a metabolically disordered state.
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Lorenz V, Ditamo Y, Cejas RB, Carrizo ME, Bennett EP, Clausen H, Nores GA, Irazoqui FJ. Extrinsic Functions of Lectin Domains in O-N-Acetylgalactosamine Glycan Biosynthesis. J Biol Chem 2016; 291:25339-25350. [PMID: 27738109 PMCID: PMC5207237 DOI: 10.1074/jbc.m116.740795] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Revised: 09/30/2016] [Indexed: 01/06/2023] Open
Abstract
Glycan biosynthesis occurs mainly in Golgi. Molecular organization and functional regulation of this process are not well understood. We evaluated the extrinsic effect of lectin domains (β-trefoil fold) of polypeptide GalNAc-transferases (ppGalNAc-Ts) on catalytic activity of glycosyltransferases during O-GalNAc glycan biosynthesis. The presence of lectin domain T3lec or T4lec during ppGalNAc-T2 and ppGalNAc-T3 catalytic reaction had a clear inhibitory effect on GalNAc-T activity. Interaction of T3lec or T4lec with ppGalNAc-T2 catalytic domain was not mediated by carbohydrate. T3lec, but not T2lec and T4lec, had a clear activating effect on Drosophila melanogaster core 1 galactosyltransferase enzyme activity and a predominant inhibitory effect on in vivo human core 1 glycan biosynthesis. The regulatory role of the β-trefoil fold of ppGalNAc-Ts in enzymatic activity of glycosyltransferases involved in the O-glycan biosynthesis pathway, described here for the first time, helps clarify the mechanism of biosynthesis of complex biopolymers (such as glycans) that is not template-driven.
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Affiliation(s)
- Virginia Lorenz
- From the Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina and
| | - Yanina Ditamo
- From the Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina and
| | - Romina B Cejas
- From the Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina and
| | - Maria E Carrizo
- From the Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina and
| | - Eric P Bennett
- Copenhagen Center for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | - Henrik Clausen
- Copenhagen Center for Glycomics, Faculty of Health and Medical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen, Denmark
| | - Gustavo A Nores
- From the Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina and
| | - Fernando J Irazoqui
- From the Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), and Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, X5000HUA Córdoba, Argentina and
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Guerra Y, Valiente PA, Pons T, Berry C, Rudiño-Piñera E. Structures of a bi-functional Kunitz-type STI family inhibitor of serine and aspartic proteases: Could the aspartic protease inhibition have evolved from a canonical serine protease-binding loop? J Struct Biol 2016; 195:259-271. [PMID: 27329566 DOI: 10.1016/j.jsb.2016.06.014] [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: 04/09/2016] [Revised: 06/14/2016] [Accepted: 06/18/2016] [Indexed: 01/06/2023]
Abstract
Bi-functional inhibitors from the Kunitz-type soybean trypsin inhibitor (STI) family are glycosylated proteins able to inhibit serine and aspartic proteases. Here we report six crystal structures of the wild-type and a non-glycosylated mutant of the bifunctional inhibitor E3Ad obtained at different pH values and space groups. The crystal structures show that E3Ad adopts the typical β-trefoil fold of the STI family exhibiting some conformational changes due to pH variations and crystal packing. Despite the high sequence identity with a recently reported potato cathepsin D inhibitor (PDI), three-dimensional structures obtained in this work show a significant conformational change in the protease-binding loop proposed for aspartic protease inhibition. The E3Ad binding loop for serine protease inhibition is also proposed, based on structural similarity with a novel non-canonical conformation described for the double-headed inhibitor API-A from the Kunitz-type STI family. In addition, structural and sequence analyses suggest that bifunctional inhibitors of serine and aspartic proteases from the Kunitz-type STI family are more similar to double-headed inhibitor API-A than other inhibitors with a canonical protease-binding loop.
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Affiliation(s)
- Yasel Guerra
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Avenida Universidad 2001, Colonia Chamilpa, Cuernavaca, Morelos CP 62210, Mexico.
| | - Pedro A Valiente
- Laboratorio de Biología Computacional y Diseño de Proteínas, Centro de Estudios de Proteínas (CEP), Facultad de Biología, Universidad de La Habana, Cuba
| | - Tirso Pons
- Structural Biology and Biocomputing Programme, Spanish National Cancer Research Centre (CNIO), C/Melchor Fernández Almagro 3, Madrid 28029, Spain
| | - Colin Berry
- Cardiff School of Biosciences, Cardiff University, Cardiff CF10 3AT, Wales, UK
| | - Enrique Rudiño-Piñera
- Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México (UNAM), Avenida Universidad 2001, Colonia Chamilpa, Cuernavaca, Morelos CP 62210, Mexico.
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Grosse-Holz FM, van der Hoorn RAL. Juggling jobs: roles and mechanisms of multifunctional protease inhibitors in plants. THE NEW PHYTOLOGIST 2016; 210:794-807. [PMID: 26800491 DOI: 10.1111/nph.13839] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 12/01/2015] [Indexed: 05/13/2023]
Abstract
Multifunctional protease inhibitors juggle jobs by targeting different enzymes and thereby often controlling more than one biological process. Here, we discuss the biological functions, mechanisms and evolution of three types of multifunctional protease inhibitors in plants. The first type is double-headed inhibitors, which feature two inhibitory sites targeting proteases with different specificities (e.g. Bowman-Birk inhibitors) or even different hydrolases (e.g. α-amylase/protease inhibitors preventing both early germination and seed predation). The second type consists of multidomain inhibitors which evolved by intragenic duplication and are released by processing (e.g. multicystatins and potato inhibitor II, implicated in tuber dormancy and defence, respectively). The third type consists of promiscuous inhibitory folds which resemble mouse traps that can inhibit different proteases cleaving the bait they offer (e.g. serpins, regulating cell death, and α-macroglobulins). Understanding how multifunctional inhibitors juggle biological jobs increases our knowledge of the connections between the networks they regulate. These examples show that multifunctionality evolved independently from a remarkable diversity of molecular mechanisms that can be exploited for crop improvement and provide concepts for protein design.
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Affiliation(s)
- Friederike M Grosse-Holz
- Plant Chemetics Laboratory, Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
| | - Renier A L van der Hoorn
- Plant Chemetics Laboratory, Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK
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17
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Shah KR, Patel DK, Pappachan A, Prabha CR, Singh DD. Characterization of a Kunitz-type serine protease inhibitor from Solanum tuberosum having lectin activity. Int J Biol Macromol 2016; 83:259-69. [DOI: 10.1016/j.ijbiomac.2015.11.068] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 11/24/2015] [Accepted: 11/25/2015] [Indexed: 10/22/2022]
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18
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A conserved tryptophan (W91) at the barrel-lid junction modulates the packing and stability of Kunitz (STI) family of inhibitors. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:55-64. [DOI: 10.1016/j.bbapap.2014.10.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Revised: 10/09/2014] [Accepted: 10/23/2014] [Indexed: 11/18/2022]
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19
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Botelho-Júnior S, Machado OLT, Fernandes KVS, Lemos FJA, Perdizio VA, Oliveira AEA, Monteiro LR, Filho ML, Jacinto T. Defense response in non-genomic model species: methyl jasmonate exposure reveals the passion fruit leaves' ability to assemble a cocktail of functionally diversified Kunitz-type trypsin inhibitors and recruit two of them against papain. PLANTA 2014; 240:345-56. [PMID: 24849173 DOI: 10.1007/s00425-014-2085-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 04/17/2014] [Indexed: 05/13/2023]
Abstract
Multiplicity of protease inhibitors induced by predators may increase the understanding of a plant's intelligent behavior toward environmental challenges. Information about defense mechanisms of non-genomic model plant passion fruit (Passiflora edulis Sims) in response to predator attack is still limited. Here, via biochemical approaches, we showed its flexibility to build-up a broad repertoire of potent Kunitz-type trypsin inhibitors (KTIs) in response to methyl jasmonate. Seven inhibitors (20-25 kDa) were purified from exposed leaves by chromatographic techniques. Interestingly, the KTIs possessed truncated Kunitz motif in their N-terminus and some of them also presented non-consensus residues. Gelatin-Native-PAGE established multiple isoforms for each inhibitor. Significant differences regarding inhibitors' activity toward trypsin and chymotrypsin were observed, indicating functional polymorphism. Despite its rarity, two of them also inhibited papain, and such bifunctionality suggests a recruiting process onto another mechanistic class of target protease (cysteine-type). All inhibitors acted strongly on midgut proteases from sugarcane borer, Diatraea saccharalis (a lepidopteran insect) while in vivo assays supported their insecticide properties. Moreover, the bifunctional inhibitors displayed activity toward midgut proteases from cowpea weevil, Callosobruchus maculatus (a coleopteran insect). Unexpectedly, all inhibitors were highly effective against midgut proteases from Aedes aegypti a dipteran insect (vector of neglected tropical diseases) opening new avenues for plant-derived PIs for vector control-oriented research. Our results reflect the KTIs' complexities in passion fruit which could be wisely exploited by influencing plant defense conditions. Therefore, the potential of passion fruit as source of bioactive compounds with diversified biotechnological application was strengthened.
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Affiliation(s)
- Sylvio Botelho-Júnior
- Laboratório de Biotecnologia, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes, RJ, 28013-600, Brazil
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Avanzo Caglič P, Renko M, Turk D, Kos J, Sabotič J. Fungal β-trefoil trypsin inhibitors cnispin and cospin demonstrate the plasticity of the β-trefoil fold. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:1749-56. [PMID: 25034500 DOI: 10.1016/j.bbapap.2014.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 07/04/2014] [Accepted: 07/08/2014] [Indexed: 10/25/2022]
Abstract
The recently identified fungal protease inhibitors cnispin, from Clitocybe nebularis, and cospin, from Coprinopsis cinerea, are both β-trefoil proteins highly specific for trypsin. The reactive site residue of cospin, Arg27, is located on the β2-β3 loop. We show here, that the reactive site residue in cnispin is Lys127, located on the β11-β12 loop. Cnispin is a substrate-like inhibitor and the β11-β12 loop is yet another β-trefoil fold loop recruited for serine protease inhibition. By site-directed mutagenesis of the P1 residues in the β2-β3 and β11-β12 loops in cospin and cnispin, protease inhibitors with different specificities for trypsin and chymotrypsin inhibition have been engineered. Double headed inhibitors of trypsin or trypsin and chymotrypsin were prepared by introducing a second specific site residue into the β2-β3 loop in cnispin and into the β11-β12 loop in cospin. These results show that β-trefoil protease inhibitors from mushrooms exhibit broad plasticity of loop utilization in protease inhibition.
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Affiliation(s)
- Petra Avanzo Caglič
- Department of Biotechnology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Miha Renko
- Department of Biochemistry, Molecular, and Structural Biology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Dušan Turk
- Department of Biochemistry, Molecular, and Structural Biology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; Centre of Excellence for Integrated Approaches in Chemistry and Biology of Proteins, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - Janko Kos
- Department of Biotechnology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia; Faculty of Pharmacy, University of Ljubljana, Aškerčeva 7, SI-1000 Ljubljana, Slovenia
| | - Jerica Sabotič
- Department of Biotechnology, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
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Bruno-Moreno F, Sombra Basílio de Oliveira R, de Azevedo Moreira R, Pinto Lobo MD, Teixeira de Freitas CD, Viana Ramos M, Barbosa Grangeiro T, Oliveira Monteiro-Moreira AC. Crystallization and X-ray diffraction analysis of an antifungal laticifer protein. Acta Crystallogr Sect F Struct Biol Cryst Commun 2013; 69:646-9. [PMID: 23722843 PMCID: PMC3668584 DOI: 10.1107/s1744309113011378] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2013] [Accepted: 04/25/2013] [Indexed: 11/10/2022]
Abstract
An osmotin (CpOsm) from the latex of Calotropis procera has been crystallized in both tetragonal and trigonal forms suitable for structure determination. Crystallographic studies of CpOsm are of great interest because limited information is available concerning the structure of latex proteins and CpOsm has previously been shown to interact with the spore membranes of some plant pathogenic fungi, thus impairing spore germination and hyphal growth. CpOsm crystals were grown using 0.1 M HEPES buffer pH 7.5, 26% PEG 4000, 0.2 M ammonium sulfate (space group P4(3)) or using 0.1 M HEPES buffer pH 7.5, 35% MPD, 0.7 M ammonium sulfate (space group P3(1)12). X-ray diffraction data were collected to 2.17 Å (P4(3)) and 1.80 Å (P3(1)12) resolution and molecular-replacement analyses produced initial phases for both crystal forms.
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Affiliation(s)
- Frederico Bruno-Moreno
- Centro de Ciências da Saúde, Universidade de Fortaleza, Avenida Washington Soares 1321, Bairro Edson Queiroz, 60811-905 Fortaleza-CE, Brazil
| | | | - Renato de Azevedo Moreira
- Centro de Ciências da Saúde, Universidade de Fortaleza, Avenida Washington Soares 1321, Bairro Edson Queiroz, 60811-905 Fortaleza-CE, Brazil
| | | | | | - Márcio Viana Ramos
- Universidade Federal do Ceará, Campus do Pici, 60451-970 Fortaleza-CE, Brazil
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Meulenbroek EM, Thomassen EAJ, Pouvreau L, Abrahams JP, Gruppen H, Pannu NS. Structure of a post-translationally processed heterodimeric double-headed Kunitz-type serine protease inhibitor from potato. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2012; 68:794-9. [PMID: 22751664 DOI: 10.1107/s090744491201222x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Accepted: 03/21/2012] [Indexed: 11/10/2022]
Abstract
Potato serine protease inhibitor (PSPI) constitutes about 22% of the total amount of proteins in potato tubers (cv. Elkana), making it the most abundant protease inhibitor in the plant. PSPI is a heterodimeric double-headed Kunitz-type serine protease inhibitor that can tightly and simultaneously bind two serine proteases by mimicking the substrate of the enzyme with its reactive-site loops. Here, the crystal structure of PSPI is reported, representing the first heterodimeric double-headed Kunitz-type serine protease inhibitor structure to be determined. PSPI has a β-trefoil fold and, based on the structure, two reactive-site loops bearing residues Phe75 and Lys95 were identified.
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Affiliation(s)
- Elisabeth M Meulenbroek
- Biophysical Structural Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
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