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Martins LA, Buša M, Chlastáková A, Kotál J, Beránková Z, Stergiou N, Jmel MA, Schmitt E, Chmelař J, Mareš M, Kotsyfakis M. Protease-bound structure of Ricistatin provides insights into the mechanism of action of tick salivary cystatins in the vertebrate host. Cell Mol Life Sci 2023; 80:339. [PMID: 37898573 PMCID: PMC11071917 DOI: 10.1007/s00018-023-04993-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 05/12/2023] [Revised: 09/28/2023] [Accepted: 09/29/2023] [Indexed: 10/30/2023]
Abstract
Tick saliva injected into the vertebrate host contains bioactive anti-proteolytic proteins from the cystatin family; however, the molecular basis of their unusual biochemical and physiological properties, distinct from those of host homologs, is unknown. Here, we present Ricistatin, a novel secreted cystatin identified in the salivary gland transcriptome of Ixodes ricinus ticks. Recombinant Ricistatin inhibited host-derived cysteine cathepsins and preferentially targeted endopeptidases, while having only limited impact on proteolysis driven by exopeptidases. Determination of the crystal structure of Ricistatin in complex with a cysteine cathepsin together with characterization of structural determinants in the Ricistatin binding site explained its restricted specificity. Furthermore, Ricistatin was potently immunosuppressive and anti-inflammatory, reducing levels of pro-inflammatory cytokines IL-6, IL-1β, and TNF-α and nitric oxide in macrophages; IL-2 and IL-9 levels in Th9 cells; and OVA antigen-induced CD4+ T cell proliferation and neutrophil migration. This work highlights the immunotherapeutic potential of Ricistatin and, for the first time, provides structural insights into the unique narrow selectivity of tick salivary cystatins determining their bioactivity.
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Affiliation(s)
- Larissa A Martins
- Institute of Parasitology, Branišovská 1160/31, 37005, Ceske Budejovice, Czech Republic
- Laboratory of Neurological Infections and Immunity, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT, 59840, USA
| | - Michal Buša
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo N. 2, 16610, Prague, Czech Republic
| | - Adéla Chlastáková
- Department of Medical Biology, Faculty of Science, the University of South Bohemia in České Budějovice, Branišovská 1760C, 37005, Ceske Budejovice, Czech Republic
| | - Jan Kotál
- Institute of Parasitology, Branišovská 1160/31, 37005, Ceske Budejovice, Czech Republic
- Department of Medical Biology, Faculty of Science, the University of South Bohemia in České Budějovice, Branišovská 1760C, 37005, Ceske Budejovice, Czech Republic
| | - Zuzana Beránková
- Department of Medical Biology, Faculty of Science, the University of South Bohemia in České Budějovice, Branišovská 1760C, 37005, Ceske Budejovice, Czech Republic
| | - Natascha Stergiou
- Institute for Immunology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Mohamed Amine Jmel
- Institute of Parasitology, Branišovská 1160/31, 37005, Ceske Budejovice, Czech Republic
| | - Edgar Schmitt
- Institute for Immunology, University Medical Center of the Johannes Gutenberg-University Mainz, Langenbeckstrasse 1, 55131, Mainz, Germany
| | - Jindřich Chmelař
- Department of Medical Biology, Faculty of Science, the University of South Bohemia in České Budějovice, Branišovská 1760C, 37005, Ceske Budejovice, Czech Republic
| | - Michael Mareš
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo N. 2, 16610, Prague, Czech Republic.
| | - Michail Kotsyfakis
- Institute of Parasitology, Branišovská 1160/31, 37005, Ceske Budejovice, Czech Republic.
- Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology-Hellas, N. Plastira 100, 70013, Heraklion, Crete, Greece.
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Lu S, da Rocha LA, Torquato RJS, da Silva Vaz Junior I, Florin-Christensen M, Tanaka AS. A novel type 1 cystatin involved in the regulation of Rhipicephalus microplus midgut cysteine proteases. Ticks Tick Borne Dis 2020; 11:101374. [PMID: 32008997 DOI: 10.1016/j.ttbdis.2020.101374] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 09/21/2019] [Revised: 01/03/2020] [Accepted: 01/10/2020] [Indexed: 01/20/2023]
Abstract
Rhipicephalus microplus is a cattle ectoparasite found in tropical and subtropical regions around the world with great impact on livestock production. R. microplus can also harbor pathogens, such as Babesia sp. and Anaplasma sp. which further compromise cattle production. Blood meal acquisition and digestion are key steps for tick development. In ticks, digestion takes place inside midgut cells and is mediated by aspartic and cysteine peptidases and, therefore, regulated by their inhibitors. Cystatins are a family of cysteine peptidases inhibitors found in several organisms and have been associated in ticks with blood acquisition, blood digestion, modulation of host immune response and tick immunity. In this work, we characterized a novel R. microplus type 1 cystatin, named Rmcystatin-1b. The inhibitor transcripts were found to be highly expressed in the midgut of partially and fully engorged females and they appear to be modulated at different days post-detachment. Purified recombinant Rmcystatin-1b displayed inhibitory activity towards typical cysteine peptidases with high affinity. Moreover, rRmcystatin-1b was able to inhibit native R. microplus cysteine peptidases and RNAi-mediated knockdown of the cystatin transcripts resulted in increased proteolytic activity. Moreover, rRmcystatin-1b was able to interfere with B. bovis growth in vitro. Taken together our data strongly suggest that Rmcystatin-1b is a regulator of blood digestion in R. microplus midgut.
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Affiliation(s)
- Stephen Lu
- Department of Biochemistry, Escola Paulista de Medicina, Universidade de Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Leticia A da Rocha
- Department of Biochemistry, Escola Paulista de Medicina, Universidade de Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Ricardo J S Torquato
- Department of Biochemistry, Escola Paulista de Medicina, Universidade de Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil
| | - Itabajara da Silva Vaz Junior
- Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), RS, Brazil; Faculdade de Veterinária, Universidade Federal do Rio Grande do Sul (UFRGS), RS, Brazil; Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-em), RJ, Brazil
| | - Monica Florin-Christensen
- Instituto de Patobiologia Veterinaria, Centro de Investigaciones en Ciencias Veterinarias y Agronómicas (CICVyA), INTA-Castelar, Los Reseros y Nicolas Repetto s/n, Hurlingham 1686, Argentina; National Council of Scientific and Technological Research (CONICET), Ciudad Autónoma de Buenos Aires C1033AAj, Argentina
| | - Aparecida S Tanaka
- Department of Biochemistry, Escola Paulista de Medicina, Universidade de Federal de São Paulo (UNIFESP), São Paulo, SP, Brazil; Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular (INCT-em), RJ, Brazil.
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Nandy SK, Seal A. Structural Dynamics Investigation of Human Family 1 & 2 Cystatin-Cathepsin L1 Interaction: A Comparison of Binding Modes. PLoS One 2016; 11:e0164970. [PMID: 27764212 PMCID: PMC5072729 DOI: 10.1371/journal.pone.0164970] [Citation(s) in RCA: 7] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 10/04/2016] [Indexed: 11/19/2022] Open
Abstract
Cystatin superfamily is a large group of evolutionarily related proteins involved in numerous physiological activities through their inhibitory activity towards cysteine proteases. Despite sharing the same cystatin fold, and inhibiting cysteine proteases through the same tripartite edge involving highly conserved N-terminal region, L1 and L2 loop; cystatins differ widely in their inhibitory affinity towards C1 family of cysteine proteases and molecular details of these interactions are still elusive. In this study, inhibitory interactions of human family 1 & 2 cystatins with cathepsin L1 are predicted and their stability and viability are verified through protein docking & comparative molecular dynamics. An overall stabilization effect is observed in all cystatins on complex formation. Complexes are mostly dominated by van der Waals interaction but the relative participation of the conserved regions varied extensively. While van der Waals contacts prevail in L1 and L2 loop, N-terminal segment chiefly acts as electrostatic interaction site. In fact the comparative dynamics study points towards the instrumental role of L1 loop in directing the total interaction profile of the complex either towards electrostatic or van der Waals contacts. The key amino acid residues surfaced via interaction energy, hydrogen bonding and solvent accessible surface area analysis for each cystatin-cathepsin L1 complex influence the mode of binding and thus control the diverse inhibitory affinity of cystatins towards cysteine proteases.
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Affiliation(s)
- Suman Kumar Nandy
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, West Bengal, India
| | - Alpana Seal
- Department of Biochemistry & Biophysics, University of Kalyani, Kalyani, West Bengal, India
- * E-mail:
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Yadav VK, Mandal RS, Puniya BL, Singh S, Yadav S. Studies on the interactions of SAP-1 (an N-terminal truncated form of cystatin S) with its binding partners by CD-spectroscopic and molecular docking methods. J Biomol Struct Dyn 2015; 33:147-57. [PMID: 24261636 DOI: 10.1080/07391102.2013.855882] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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] [Indexed: 02/07/2023]
Abstract
SAP-1 is a 113 amino acid long single-chain protein which belongs to the type 2 cystatin gene family. In our previous study, we have purified SAP-1 from human seminal plasma and observed its cross-class inhibitory property. At this time, we report the interaction of SAP-1 with diverse proteases and its binding partners by CD-spectroscopic and molecular docking methods. The circular dichroism (CD) spectroscopic studies demonstrate that the conformation of SAP-1 is changed after its complexation with proteases, and the alterations in protein secondary structure are quantitatively calculated with increase of α-helices and reduction of β-strand content. To get insight into the interactions between SAP-1 and proteases, we make an effort to model the three-dimensional structure of SAP-1 by molecular modeling and verify its stability and viability through molecular dynamics simulations and finally complexed with different proteases using ClusPro 2.0 Server. A high degree of shape complementarity is examined within the complexes, stabilized by a number of hydrogen bonds (HBs) and hydrophobic interactions. Using HB analyses in different protein complexes, we have identified a series of key residues that may be involved in the interactions between SAP-1 and proteases. These findings will assist to understand the mechanism of inhibition of SAP-1 for different proteases and provide intimation for further research.
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Affiliation(s)
- Vikash Kumar Yadav
- a Department of Biophysics , All India Institute of Medical Sciences , Delhi 110029 , India
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Ryan CM, Souda P, Halgand F, Wong DT, Loo JA, Faull KF, Whitelegge JP. Confident assignment of intact mass tags to human salivary cystatins using top-down Fourier-transform ion cyclotron resonance mass spectrometry. J Am Soc Mass Spectrom 2010; 21:908-17. [PMID: 20189825 PMCID: PMC2873128 DOI: 10.1016/j.jasms.2010.01.025] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2009] [Revised: 01/22/2010] [Accepted: 01/26/2010] [Indexed: 05/12/2023]
Abstract
A hybrid linear ion-trap Fourier-transform ion cyclotron resonance mass spectrometer was used for top-down characterization of the abundant human salivary cystatins, including S, S1, S2, SA, SN, C, and D, using collisionally activated dissociation (CAD) after chromatographic purification of the native, disulfide intact proteins. Post-translational modifications and protein sequence polymorphisms arising from single nucleotide polymorphisms (SNPs) were assigned from precursor and product ion masses at a tolerance of 10 ppm, allowing confident identification of individual intact mass tags. Cystatins S, S1, S2, SA, and SN were cleaved of a N-terminal 20 amino acid signal peptide and cystatin C a 26-residue peptide, to yield a generally conserved N-terminus. In contrast, cystatin D isoforms with 24 and 28 amino acid residue N-terminal truncations were found such that their N-termini were not conserved. Cystatin S1 was phosphorylated at Ser3, while S2 was phosphorylated at Ser1 and Ser3, in agreement with previous work. Both cystatin D isoforms carried the polymorphism C46R (SNP: rs1799841). The 14,328 Da isoform of cystatin SN previously assigned with polymorphism P31L due to a SNP (rs2070856) was found only in whole saliva. Parotid secretions contained no detectable cystatins while whole saliva largely mirrored the contents of submandibular/sublingual (SMSL) secretions. With fully characterized cystatin intact mass tags it will now be possible to examine the correlation between the abundance of these molecules and human health and disease.
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Affiliation(s)
- Christopher M. Ryan
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
| | - Puneet Souda
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
| | - Frederic Halgand
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
| | - David T. Wong
- School of Dentistry, University of California Los Angeles
- Dental Research Institute, University of California Los Angeles
- The Molecular Biology Institute, University of California Los Angeles
| | - Joseph A. Loo
- The Molecular Biology Institute, University of California Los Angeles
- Departments of Chemistry & Biochemistry and Biological Chemistry, University of California Los Angeles
| | - Kym F. Faull
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
- The Molecular Biology Institute, University of California Los Angeles
- The Brain Research Institute, University of California Los Angeles
| | - Julian P. Whitelegge
- The Pasarow Mass Spectrometry Laboratory, The NPI- Semel Institute for Neuroscience and Human Behavior, David Geffen School of Medicine, University of California Los Angeles
- The Molecular Biology Institute, University of California Los Angeles
- The Brain Research Institute, University of California Los Angeles
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Vitali A, Carelli Alinovi C, De Rosa MC, Petruzzelli R. Beta2-strand of salivary S cystatins: a "chemeleon sequence". Biochem Biophys Res Commun 2009; 387:47-51. [PMID: 19555661 DOI: 10.1016/j.bbrc.2009.06.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 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] [Received: 06/17/2009] [Accepted: 06/19/2009] [Indexed: 05/28/2023]
Abstract
Secondary structure prediction of salivary cystatins S, SA, and SN carried out by several methods label the 39-58 sequence (beta2-strand) as predominantly alpha-helical. The helical propensity of a peptide corresponding to beta2-strand of salivary SA cystatin analyzed by CD display high helical propensity in aqueous solution, whereas peptides matching the beta2-strand amino acid sequence of cystatins S and SN, display random coil conformation in aqueous solution but acquire alpha-helical conformation in the presence of trifluoroethanol (TFE). Moreover molecular dynamics simulation performed on the homology modeling of cystatin SA constructed on the basis of recently determined three-dimensional structure of salivary cystatin D, suggests that cystatin SA does not significantly deviate from the starting structure over the course of the simulation. The results obtained indicate that the beta2-strand of salivary S cystatins has high helical propensity when isolated from native protein and acquire the final beta structure by interaction with the rest of the polypeptide chain.
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Affiliation(s)
- Alberto Vitali
- Istituto di Biochimica e Biochimica Clinica, Facoltà di Medicina, Università Cattolica e/o Istituto per la Chimica del Riconoscimento Molecolare, C.N.R., Largo F. Vito 1, Rome, Italy
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