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Salgado-Martínez AI, Avila-Bonilla RG, Ramírez-Moreno E, Castañón-Sánchez CA, López-Camarillo C, Marchat LA. Unraveling the relevance of the polyadenylation factor EhCFIm25 in Entamoeba histolytica through proteomic analysis. FEBS Open Bio 2021; 11:2819-2835. [PMID: 34486252 PMCID: PMC8487052 DOI: 10.1002/2211-5463.13287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 08/06/2021] [Accepted: 09/02/2021] [Indexed: 11/16/2022] Open
Abstract
We recently reported that silencing of the polyadenylation factor EhCFIm25 in Entamoeba histolytica, the protozoan which causes human amoebiasis, affects trophozoite proliferation, death, and virulence, suggesting that EhCFIm25 may have potential as a new biochemical target. Here, we performed a shotgun proteomic analysis to identify modulated proteins that could explain this phenotype. Data are available via ProteomeXchange with identifier PXD027784. Our results revealed changes in the abundance of 75 proteins. Interestingly, STRING analysis, functional GO‐term annotations, KEGG analyses, and literature review showed that modulated proteins are mainly related to glycolysis and carbon metabolism, cytoskeleton dynamics, and parasite virulence, as well as gene expression and protein modifications. Further studies are needed to confirm the hypotheses emerging from this proteomic analysis, to thereby acquire a comprehensive view of the molecular mechanisms involved.
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Affiliation(s)
| | | | - Esther Ramírez-Moreno
- Laboratorio de Biomedicina Molecular II, ENMH, Instituto Politécnico Nacional, Mexico City, Mexico
| | | | - César López-Camarillo
- Posgrado en Ciencias Genómicas, Universidad Autónoma de la Ciudad de México (UACM), Mexico
| | - Laurence A Marchat
- Laboratorio de Biomedicina Molecular II, ENMH, Instituto Politécnico Nacional, Mexico City, Mexico
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Rath PP, Gourinath S. The actin cytoskeleton orchestra in Entamoeba histolytica. Proteins 2020; 88:1361-1375. [PMID: 32506560 DOI: 10.1002/prot.25955] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 04/17/2020] [Accepted: 05/27/2020] [Indexed: 12/14/2022]
Abstract
Years of evolution have kept actin conserved throughout various clades of life. It is an essential protein starring in many cellular processes. In a primitive eukaryote named Entamoeba histolytica, actin directs the process of phagocytosis. A finely tuned coordination between various actin-binding proteins (ABPs) choreographs this process and forms one of the virulence factors for this protist pathogen. The ever-expanding world of ABPs always has space to accommodate new and varied types of proteins to the earlier existing repertoire. In this article, we report the identification of 390 ABPs from Entamoeba histolytica. These proteins are part of diverse families that have been known to regulate actin dynamics. Most of the proteins are primarily uncharacterized in this organism; however, this study aims to annotate the ABPs based on their domain arrangements. A unique characteristic about some of the ABPs found is the combination of domains present in them unlike any other reported till date. Calponin domain-containing proteins formed the largest group among all types with 38 proteins, followed by 29 proteins with the infamous BAR domain in them, and 23 proteins belonging to actin-related proteins. The other protein families had a lesser number of members. Presence of exclusive domain arrangements in these proteins could guide us to yet unknown actin regulatory mechanisms prevalent in nature. This article is the first step to unraveling them.
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Calcium modulates the domain flexibility and function of an α-actinin similar to the ancestral α-actinin. Proc Natl Acad Sci U S A 2020; 117:22101-22112. [PMID: 32848067 DOI: 10.1073/pnas.1917269117] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The actin cytoskeleton, a dynamic network of actin filaments and associated F-actin-binding proteins, is fundamentally important in eukaryotes. α-Actinins are major F-actin bundlers that are inhibited by Ca2+ in nonmuscle cells. Here we report the mechanism of Ca2+-mediated regulation of Entamoeba histolytica α-actinin-2 (EhActn2) with features expected for the common ancestor of Entamoeba and higher eukaryotic α-actinins. Crystal structures of Ca2+-free and Ca2+-bound EhActn2 reveal a calmodulin-like domain (CaMD) uniquely inserted within the rod domain. Integrative studies reveal an exceptionally high affinity of the EhActn2 CaMD for Ca2+, binding of which can only be regulated in the presence of physiological concentrations of Mg2+ Ca2+ binding triggers an increase in protein multidomain rigidity, reducing conformational flexibility of F-actin-binding domains via interdomain cross-talk and consequently inhibiting F-actin bundling. In vivo studies uncover that EhActn2 plays an important role in phagocytic cup formation and might constitute a new drug target for amoebic dysentery.
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Backman L. Alpha-actinin of the chlorarchiniophyte Bigelowiella natans. PeerJ 2018; 6:e4288. [PMID: 29372122 PMCID: PMC5775757 DOI: 10.7717/peerj.4288] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 01/03/2018] [Indexed: 12/29/2022] Open
Abstract
The genome of the chlorarchiniophyte Bigelowiella natans codes for a protein annotated as an α-actinin-like protein. Analysis of the primary sequence indicate that this protein has the same domain structure as other α-actinins, a N-terminal actin-binding domain and a C-terminal calmodulin-like domain. These two domains are connected by a short rod domain, albeit long enough to form a single spectrin repeat. To analyse the functional properties of this protein, the full-length protein as well as the separate domains were cloned and isolated. Characerisation showed that the protein is capable of cross-linking actin filaments into dense bundles, probably due to dimer formation. Similar to human α-actinin, calcium-binding occurs to the most N-terminal EF-hand motif in the calmodulin-like C-terminal domain. The results indicate that this Bigelowiella protein is a proper α-actinin, with all common characteristics of a typical α-actinin.
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Affiliation(s)
- Lars Backman
- Department of Chemistry, Umeå University, Umeå, Sweden
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Karlsson G, Persson C, Mayzel M, Hedenström M, Backman L. Solution structure of the calmodulin-like C-terminal domain of Entamoeba α-actinin2. Proteins 2016; 84:461-6. [PMID: 26800385 DOI: 10.1002/prot.24992] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 01/11/2016] [Accepted: 01/12/2016] [Indexed: 11/12/2022]
Abstract
Cell motility is dependent on a dynamic meshwork of actin filaments that is remodelled continuously. A large number of associated proteins that are severs, cross-links, or caps the filament ends have been identified and the actin cross-linker α-actinin has been implied in several important cellular processes. In Entamoeba histolytica, the etiological agent of human amoebiasis, α-actinin is believed to be required for infection. To better understand the role of α-actinin in the infectious process we have determined the solution structure of the C-terminal calmodulin-like domain using NMR. The final structure ensemble of the apo form shows two lobes, that both resemble other pairs of calcium-binding EF-hand motifs, connected with a mobile linker.
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Affiliation(s)
- Göran Karlsson
- Swedish NMR Centre at the University of Gothenburg, PO Box 465, Gothenburg, SE-40530, Sweden
| | - Cecilia Persson
- Swedish NMR Centre at the University of Gothenburg, PO Box 465, Gothenburg, SE-40530, Sweden
| | - Maxim Mayzel
- Swedish NMR Centre at the University of Gothenburg, PO Box 465, Gothenburg, SE-40530, Sweden
| | | | - Lars Backman
- Department of Chemistry, Umeå University, Umeå, SE-901 87, Sweden
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Bolaños V, Díaz-Martínez A, Soto J, Rodríguez MA, López-Camarillo C, Marchat LA, Ramírez-Moreno E. The flavonoid (-)-epicatechin affects cytoskeleton proteins and functions in Entamoeba histolytica. J Proteomics 2014; 111:74-85. [PMID: 24887480 DOI: 10.1016/j.jprot.2014.05.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 05/01/2014] [Accepted: 05/22/2014] [Indexed: 11/18/2022]
Abstract
UNLABELLED Human amoebiasis is an intestinal disease with a global distribution. Due to reports of parasite resistance or susceptibility reduction to metronidazole treatment, there is a renewed interest for the search of new molecules with antiamoebic activity. The flavonoid (-)-epicatechin that was isolated from the Mexican medicinal plant Geranium mexicanum HBK has an in vitro activity against E. histolytica trophozoites, however its molecular effects have been poorly documented. Using a proteomic approach based on two-dimensional gel electrophoresis and mass spectrometry (ESI-MS/MS) analysis, we evidenced that E. histolytica cytoskeleton proteins exhibit differential abundance in response to (-)-epicatechin treatment. Moreover, functional assays revealed modification on pathogenic mechanisms associated with cytoskeleton functionality, namely, adhesion, migration, phagocytosis and cytolysis. Consequently, these data suggested that (-)-epicatechin could affect virulence properties of this human pathogen. BIOLOGICAL SIGNIFICANCE This work contributes with some advances in the action mechanisms involved in the antiamoebic effect of the flavonoid (-)-epicatechin. We found that this flavonoid has an unusual effect on trophozoites growth that is dependent of its concentration. Additionally, we reported that (-)-epicatechin affects mainly amebic cytoskeleton proteins, which results in alteration on important virulence mechanisms, like adhesion, migration, phagocytosis and cytolysis. This study provides new knowledge about a potential alternative therapy directed to the treatment of amoebiasis.
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Affiliation(s)
- Verónica Bolaños
- Posgrado en Biomedicina Molecular, ENMyH, Instituto Politécnico Nacional, México City 07320, México
| | - Alfredo Díaz-Martínez
- Posgrado en Biomedicina Molecular, ENMyH, Instituto Politécnico Nacional, México City 07320, México
| | - Jacqueline Soto
- Posgrado en Biomedicina Molecular, ENMyH, Instituto Politécnico Nacional, México City 07320, México
| | - Mario A Rodríguez
- Departamento de Infectómica y Patogénesis Molecular, CINVESTAV-IPN, México City A.P. 14740, México
| | - Cesar López-Camarillo
- Posgrado en Ciencias Genómicas, Universidad Autónoma de la Ciudad de México, México City 03100, México
| | - Laurence A Marchat
- Posgrado en Biomedicina Molecular, ENMyH, Instituto Politécnico Nacional, México City 07320, México; Doctorado en Biotecnología, ENMyH, Instituto Politécnico Nacional, México City 07320, México
| | - Esther Ramírez-Moreno
- Posgrado en Biomedicina Molecular, ENMyH, Instituto Politécnico Nacional, México City 07320, México; Doctorado en Biotecnología, ENMyH, Instituto Politécnico Nacional, México City 07320, México.
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Addario B, Huang S, Sauer UH, Backman L. Crystallization and preliminary X-ray analysis of the Entamoeba histolytica α-actinin-2 rod domain. Acta Crystallogr Sect F Struct Biol Cryst Commun 2011; 67:1214-7. [PMID: 22102030 PMCID: PMC3212365 DOI: 10.1107/s1744309111026066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 07/01/2011] [Indexed: 11/10/2022]
Abstract
α-Actinins form antiparallel homodimers that are able to cross-link actin filaments. The protein contains three domains: an N-terminal actin-binding domain followed by a central rod domain and a calmodulin-like EF-hand domain at the C-terminus. Here, crystallization of the rod domain of Entamoeba histolytica α-actinin-2 is reported; it crystallized in space group P2(1)2(1)2(1), with unit-cell parameters a = 47.8, b = 79.1, c = 141.8 Å. A Matthews coefficient V(M) of 2.6 Å(3) Da(-1) suggests that there are two molecules and 52.5% solvent content in the asymmetric unit. A complete native data set extending to a d-spacing of 2.8 Å was collected on beamline I911-2 at MAX-lab, Sweden.
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Affiliation(s)
- Barbara Addario
- Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden.
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Characterization of Neurospora crassa α-Actinin. Curr Microbiol 2011; 63:100-5. [DOI: 10.1007/s00284-011-9954-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Accepted: 05/04/2011] [Indexed: 10/18/2022]
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The domain structure of Entamoeba α-actinin2. Cell Mol Biol Lett 2010; 15:665-78. [PMID: 20865366 PMCID: PMC6275957 DOI: 10.2478/s11658-010-0035-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2010] [Accepted: 09/10/2010] [Indexed: 11/26/2022] Open
Abstract
Entamoeba histolytica, a major agent of human amoebiasis, expresses two distinct forms of α-actinin, a ubiquitous actin-binding protein that is present in most eukaryotic organisms. In contrast to all metazoan α-actinins, in both isoforms the intervening rod domain that connects the N-terminal actin-binding domain with the C-terminal EF-hands is much shorter. It is suggested that these α-actinins may be involved in amoeboid motility and phagocytosis, so we cloned and characterised each domain of one of these α-actinins to better understand their functional role. The results clearly showed that the domains have properties very similar to those of conventional α-actinins.
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Campos-Parra A, Hernández-Cuevas N, Hernandez-Rivas R, Vargas M. EhNCABP166: A nucleocytoplasmic actin-binding protein from Entamoeba histolytica. Mol Biochem Parasitol 2010; 172:19-30. [DOI: 10.1016/j.molbiopara.2010.03.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2009] [Revised: 03/09/2010] [Accepted: 03/15/2010] [Indexed: 01/06/2023]
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Histomonas meleagridis possesses three α-actinins immunogenic to its hosts. Mol Biochem Parasitol 2010; 169:101-7. [DOI: 10.1016/j.molbiopara.2009.10.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 10/02/2009] [Accepted: 10/26/2009] [Indexed: 11/18/2022]
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Blazquez S, Guigon G, Weber C, Syan S, Sismeiro O, Coppe JY, Labruyre E, Guilln N. Chemotaxis ofEntamoeba histolyticatowards the pro-inflammatory cytokine TNF is based on PI3K signalling, cytoskeleton reorganization and the GalactoseN-acetylgalactosamine lectin activity. Cell Microbiol 2008; 10:1676-86. [DOI: 10.1111/j.1462-5822.2008.01158.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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