1
|
Muruaga EJ, Briones G, Roset MS. Biochemical and functional characterization of Brucella abortus cyclophilins: So similar, yet so different. Front Microbiol 2022; 13:1046640. [DOI: 10.3389/fmicb.2022.1046640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Accepted: 10/13/2022] [Indexed: 11/13/2022] Open
Abstract
Brucella spp. are the etiological agent of animal and human brucellosis. We have reported previously that cyclophilins of Brucella (CypA and CypB) are upregulated within the intraphagosomal replicative niche and required for stress adaptation and host intracellular survival and virulence. Here, we characterize B. abortus cyclophilins, CypA, and CypB from a biochemical standpoint by studying their PPIase activity, chaperone activity, and oligomer formation. Even though CypA and CypB are very similar in sequence and share identical chaperone and PPIase activities, we were able to identify outstanding differential features between them. A series of differential peptide loops were predicted when comparing CypA and CypB, differences that might explain why specific antibodies (anti-CypA or anti-CypB) were able to discriminate between both cyclophilins without cross-reactivity. In addition, we identified the presence of critical amino acids in CypB, such as the Trp134 which is responsible for the cyclosporin A inhibition, and the Cys128 that leads to CypB homodimer formation by establishing a disulfide bond. Here, we demonstrated that CypB dimer formation was fully required for stress adaptation, survival within HeLa cells, and mouse infection in B. abortus. The presence of Trp134 and the Cys128 in CypB, which are not present in CypA, suggested that two different kinds of cyclophilins have evolved in Brucella, one with eukaryotic features (CypB), another (CypA) with similar features to Gram-negative cyclophilins.
Collapse
|
2
|
Purification and characterization of Cyclophilin: a protein associated with protein folding in Salmonella Typhimurium. Arch Microbiol 2021; 203:5509-5517. [PMID: 34417854 DOI: 10.1007/s00203-021-02519-9] [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: 06/30/2021] [Revised: 07/30/2021] [Accepted: 08/03/2021] [Indexed: 10/20/2022]
Abstract
Salmonella Typhimurium (ST) is a Gram-negative zoonotic pathogenic bacterium that causes infectious disease in humans as well as in animals. It causes foodborne diarrheal or gastrointestinal illness and fever called salmonellosis, which is a leading cause of millions of deaths worldwide. Salmonellaenterica serovar Typhimurium (S. Typhimurium) during its pathogenesis take away the actin cytoskeleton of their host cells and this is the crucial step of its infection cycle. Cyclophilin A, a type of peptidyl-prolyl isomerase that's encoded by the ppiA gene in ST, plays pleiotropic roles in maintaining bacterial physiology. In this investigation, the proteomic characterization of the peptidyl-prolyl cis-trans isomerase- A (Cyclophilin A) from Salmonella Typhimurium is reported. Cyclophilin A (CypA) protein from Salmonella Typhimurium proved to be highly conserved and homologous protein sequence compared to other organisms. This protein was expressed in Escherichia coli followed by its purification in a recombinant form protein exhibited a characteristic PPIases activity (Vmax = 0.8752 ± 0.13892 µmoles/min, Km = 0.9315 ± 0.5670 µM) in comparison to control. The mass spectrometry analysis of Cyp A protein-peptide showed a highest sequence similarity with the cyclophilin protein of Salmonella. PPIases proteins (enzyme) data suggest that Ppi-A has roles in the protein folding that may be contributing to the virulence of Salmonella by isomerization of protein outline. These results suggest an active and vital role of this protein in protein folding along with regulation in Salmonella Typhimurium.
Collapse
|
3
|
Wu J, Zhang W, Xia L, Feng L, Shu Z, Zhang J, Ye W, Zeng N, Zhou A. Characterization of PPIB interaction in the P3H1 ternary complex and implications for its pathological mutations. Cell Mol Life Sci 2019; 76:3899-3914. [PMID: 30993352 PMCID: PMC11105654 DOI: 10.1007/s00018-019-03102-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 03/20/2019] [Accepted: 04/09/2019] [Indexed: 12/12/2022]
Abstract
The P3H1/CRTAP/PPIB complex is essential for prolyl 3-hydroxylation and folding of procollagens in the endoplasmic reticulum (ER). Deficiency in any component of this ternary complex is associated with the misfolding of collagen and the onset of osteogenesis imperfecta. However, little structure information is available about how this ternary complex is assembled and retained in the ER. Here, we assessed the role of the KDEL sequence of P3H1 and probed the spatial interactions of PPIB in the complex. We show that the KDEL sequence is essential for retaining the P3H1 complex in the ER. Its removal resulted in co-secretion of P3H1 and CRTAP out of the cell, which was mediated by the binding of P3H1 N-terminal domain with CRTAP. The secreted P3H1/CRTAP can readily bind PPIB with their C-termini close to PPIB in the ternary complex. Cysteine modification, crosslinking, and mass spectrometry experiments identified PPIB surface residues involved in the complex formation, and showed that the surface of PPIB is extensively covered by the binding of P3H1 and CRTAP. Most importantly, we demonstrated that one disease-associated pathological PPIB mutation on the binding interface did not affect the PPIB prolyl-isomerase activity, but disrupted the formation of P3H1/CRTAP/PPIB ternary complex. This suggests that defects in the integrity of the P3H1 ternary complex are associated with pathological collagen misfolding. Taken together, these results provide novel structural information on how PPIB interacts with other components of the P3H1 complex and indicate that the integrity of P3H1 complex is required for proper collagen formation.
Collapse
Affiliation(s)
- Jiawei Wu
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Wenting Zhang
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Li Xia
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Lingling Feng
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Zimei Shu
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Jing Zhang
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China
| | - Wei Ye
- Department of Preventive Dentistry, The Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.
| | - Naiyan Zeng
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.
| | - Aiwu Zhou
- Department of Pathophysiology, Shanghai Tongren Hospital/Faculty of Basic Medicine, Hongqiao International Institute of Medicine; Key Laboratory of Cell Differentiation and Apoptosis of the Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.
| |
Collapse
|
4
|
Skagia A, Vezyri E, Grados K, Venieraki A, Karpusas M, Katinakis P, Dimou M. Structure-Function Analysis of the Periplasmic Escherichia coli Cyclophilin PpiA in Relation to Biofilm Formation. J Mol Microbiol Biotechnol 2017; 27:228-236. [PMID: 28889121 DOI: 10.1159/000478858] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 06/12/2017] [Indexed: 12/30/2022] Open
Abstract
The presence of peptidyl-prolyl cis/trans isomerases (PPIases, EC: 5.2.1.8) in all domains of life indicates their biological importance. Cyclophilin PpiA, present in the periplasm of gram-negative bacteria, possesses PPIase activity but its physiological functions are still not clearly defined. Here, we demonstrate that the ΔppiA deletion strain from Escherichia coli exhibits an increased ability for biofilm formation and enhanced swimming motility compared to the wild-type strain. To identify structural features of PpiA which are necessary for the negative modulation of biofilm formation, we constructed a series of mutant PpiA proteins using a combination of error-prone and site-directed mutagenesis approaches. We show that the negative effect of PpiA on biofilm formation is not dependent on its PPIase activity, since PpiA mutants with a reduced PPIase activity are able to complement the ΔppiA strain during biofilm growth.
Collapse
Affiliation(s)
- Aggeliki Skagia
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Athens, Greece
| | | | | | | | | | | | | |
Collapse
|
5
|
Microbial cyclophilins: specialized functions in virulence and beyond. World J Microbiol Biotechnol 2017; 33:164. [PMID: 28791545 DOI: 10.1007/s11274-017-2330-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 08/05/2017] [Indexed: 01/18/2023]
Abstract
Cyclophilins belong to the superfamily of peptidyl-prolyl cis/trans isomerases (PPIases, EC: 5.2.1.8), the enzymes that catalyze the cis/trans isomerization of peptidyl-prolyl peptide bonds in unfolded and partially folded polypeptide chains and native state proteins. Cyclophilins have been extensively studied, since they are involved in multiple cellular processes related to human pathologies, such as neurodegenerative disorders, infectious diseases, and cancer. However, the presence of cyclophilins in all domains of life indicates a broader biological importance. In this mini-review, we summarize current advances in the study of microbial cyclophilins. Apart from their anticipated role in protein folding and chaperoning, cyclophilins are involved in several other biological processes, such as cellular signal transduction, adaptation to stress, control of pathogens virulence, and modulation of host immune response. Since many existing family members do not have well-defined functions and novel ones are being characterized, the requirement for further studies on their biological role and molecular mechanism of action is apparent.
Collapse
|
6
|
Skagia A, Zografou C, Venieraki A, Fasseas C, Katinakis P, Dimou M. Functional analysis of the cyclophilin PpiB role in bacterial cell division. Genes Cells 2017; 22:810-824. [DOI: 10.1111/gtc.12514] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Accepted: 06/20/2017] [Indexed: 01/21/2023]
Affiliation(s)
- Aggeliki Skagia
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75 11855 Athens Greece
| | - Chrysoula Zografou
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75 11855 Athens Greece
| | - Anastasia Venieraki
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75 11855 Athens Greece
| | - Costas Fasseas
- Laboratory of Electron Microscopy; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75 11855 Athens Greece
| | - Panagiotis Katinakis
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75 11855 Athens Greece
| | - Maria Dimou
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75 11855 Athens Greece
| |
Collapse
|
7
|
Thomloudi EE, Skagia A, Venieraki A, Katinakis P, Dimou M. Functional analysis of the two cyclophilin isoforms of Sinorhizobium meliloti. World J Microbiol Biotechnol 2017; 33:28. [PMID: 28058638 DOI: 10.1007/s11274-016-2201-6] [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: 09/20/2016] [Accepted: 12/23/2016] [Indexed: 11/24/2022]
Abstract
The nitrogen fixing Sinorhizobium meliloti possesses two genes, ppiA and ppiB, encoding two cyclophilin isoforms which belong to the superfamily of peptidyl prolyl cis/trans isomerases (PPIase, EC: 5.2.1.8). Here, we functionally characterize the two proteins and we demonstrate that both recombinant cyclophilins are able to isomerise the Suc-AAPF-pNA synthetic peptide but neither of them displays chaperone function in the citrate synthase thermal aggregation assay. Furthermore, we observe that the expression of both enzymes increases the viability of E. coli BL21 in the presence of abiotic stress conditions such as increased heat and salt concentration. Our results support and strengthen previous high-throughput studies implicating S. meliloti cyclophilins in various stress conditions.
Collapse
Affiliation(s)
- Eirini-Evangelia Thomloudi
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Aggeliki Skagia
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Anastasia Venieraki
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Panagiotis Katinakis
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Maria Dimou
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece.
| |
Collapse
|
8
|
Skagia A, Vezyri E, Sigala M, Kokkinou A, Karpusas M, Venieraki A, Katinakis P, Dimou M. Structural and functional analysis of cyclophilin PpiB mutants supports anin vivofunction not limited to prolyl isomerization activity. Genes Cells 2016; 22:32-44. [DOI: 10.1111/gtc.12452] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2016] [Accepted: 10/26/2016] [Indexed: 12/24/2022]
Affiliation(s)
- Aggeliki Skagia
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Eleni Vezyri
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Markezina Sigala
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Areti Kokkinou
- Laboratory of Physics; Department of Biotechnology; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Michael Karpusas
- Laboratory of Physics; Department of Biotechnology; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Anastasia Venieraki
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Panagiotis Katinakis
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| | - Maria Dimou
- Laboratory of General and Agricultural Microbiology; Faculty of Crop Science; Agricultural University of Athens; Iera Odos 75, Votanikos Athens 11855 Greece
| |
Collapse
|
9
|
Skagia A, Zografou C, Vezyri E, Venieraki A, Katinakis P, Dimou M. Cyclophilin PpiB is involved in motility and biofilm formation via its functional association with certain proteins. Genes Cells 2016; 21:833-51. [PMID: 27306110 DOI: 10.1111/gtc.12383] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 05/09/2016] [Indexed: 12/24/2022]
Abstract
PpiB belongs to the superfamily of peptidyl-prolyl cis/trans isomerases (PPIases, EC: 5.2.1.8), which catalyze the rate-limiting protein folding step at peptidyl-prolyl bonds and control several biological processes. In this study, we show that PpiB acts as a negative effector of motility and biofilm formation ability of Escherichia coli. We identify multicopy suppressors of each ΔppiB phenotype among putative PpiB prey proteins which upon deletion are often characterized by analogous phenotypes. Many putative preys show similar gene expression in wild-type and ΔppiB genetic backgrounds implying possible post-translational modifications by PpiB. We further conducted in vivo and in vitro interaction screens to determine which of them represent true preys. For DnaK, acetyl-CoA carboxylase, biotin carboxylase subunit (AccC) and phosphate acetyltransferase (Pta) we also showed a direct role of PpiB in the functional control of these proteins because it increased the measured enzyme activity of each protein and further interfered with DnaK localization and the correct folding of AccC. Taken together, these results indicate that PpiB is involved in diverse regulatory mechanisms to negatively modulate motility and biofilm formation via its functional association with certain protein substrates.
Collapse
Affiliation(s)
- Aggeliki Skagia
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Chrysoula Zografou
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Eleni Vezyri
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Anastasia Venieraki
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Panagiotis Katinakis
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| | - Maria Dimou
- Laboratory of General and Agricultural Microbiology, Faculty of Crop Science, Agricultural University of Athens, Iera Odos 75, 11855, Athens, Greece
| |
Collapse
|
10
|
Intracellularly induced cyclophilins play an important role in stress adaptation and virulence of Brucella abortus. Infect Immun 2012; 81:521-30. [PMID: 23230297 DOI: 10.1128/iai.01125-12] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Brucella is an intracellular bacterial pathogen that causes the worldwide zoonotic disease brucellosis. Brucella virulence relies on its ability to transition to an intracellular lifestyle within host cells. Thus, this pathogen must sense its intracellular localization and then reprogram gene expression for survival within the host cell. A comparative proteomic investigation was performed to identify differentially expressed proteins potentially relevant for Brucella intracellular adaptation. Two proteins identified as cyclophilins (CypA and CypB) were overexpressed in the intracellular environment of the host cell in comparison to laboratory-grown Brucella. To define the potential role of cyclophilins in Brucella virulence, a double-deletion mutant was constructed and its resulting phenotype was characterized. The Brucella abortus ΔcypAB mutant displayed increased sensitivity to environmental stressors, such as oxidative stress, pH, and detergents. In addition, the B. abortus ΔcypAB mutant strain had a reduced growth rate at lower temperature, a phenotype associated with defective expression of cyclophilins in other microorganisms. The B. abortus ΔcypAB mutant also displays reduced virulence in BALB/c mice and defective intracellular survival in HeLa cells. These findings suggest that cyclophilins are important for Brucella virulence and survival in the host cells.
Collapse
|
11
|
Dimou M, Zografou C, Venieraki A, Katinakis P. Functional interaction of Azotobacter vinelandii cytoplasmic cyclophilin with the biotin carboxylase subunit of acetyl-CoA carboxylase. Biochem Biophys Res Commun 2012; 424:736-9. [PMID: 22809506 DOI: 10.1016/j.bbrc.2012.07.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Accepted: 07/08/2012] [Indexed: 10/28/2022]
Abstract
Cyclophilins (E.C. 5.1.2.8) are protein chaperones with peptidyl-prolyl cis/trans isomerase activity (PPIase). In the present study, we demonstrate a physical interaction among AvppiB, encoding the cytoplasmic cyclophilin from the soil nitrogen-fixing bacterium Azotobacter vinelandii, and AvaccC, encoding the biotin carboxylase subunit of acetyl-CoA carboxylase, which catalyzes the committed step in long-chain fatty acid synthesis. A decrease in AvppiB PPIase activity, in the presence of AvaccC, further confirms the interaction. However, PPIase activity seems not to be essential for these interactions since a PPIase active site mutant of cyclophilin does not abolish the AvaccC binding. We further show that the presence of cyclophilin largely influences the measured ATP hydrolyzing activity of AvaccA in a way that is negatively regulated by the PPIase activity. Taken together, our data support a novel role for cyclophilin in regulating biotin carboxylase activity.
Collapse
Affiliation(s)
- Maria Dimou
- Laboratory of General and Agricultural Microbiology, Department of Agricultural Biotechnology, Agricultural University of Athens, Iera Odos 75, 11855 Votanikos, Athens, Greece
| | | | | | | |
Collapse
|
12
|
Dimou M, Zografou C, Venieraki A, Katinakis P. Biochemical characterization of two Azotobacter vinelandii FKBPs and analysis of their interaction with the small subunit of carbamoyl phosphate synthetase. Mol Biol Rep 2012; 39:10003-12. [DOI: 10.1007/s11033-012-1869-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Accepted: 06/19/2012] [Indexed: 10/28/2022]
|
13
|
Christoforides E, Dimou M, Katinakis P, Bethanis K, Karpusas M. Structure of a bacterial cytoplasmic cyclophilin A in complex with a tetrapeptide. Acta Crystallogr Sect F Struct Biol Cryst Commun 2012; 68:259-64. [PMID: 22442217 PMCID: PMC3310525 DOI: 10.1107/s1744309112000188] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Accepted: 01/03/2012] [Indexed: 11/10/2022]
Abstract
Cyclophilins constitute a class of peptidyl-prolyl isomerases which participate in processes related to protein folding, signalling and chaperoning. The crystal structure of the cytoplasmic cyclophilin A (CyPA) from the bacterium Azotobacter vinelandii complexed with a synthetic tetrapeptide was determined by molecular replacement at 2 resolution. The proline in the tetrapeptide is observed to adopt the cis-isomer conformation. Comparisons of this structure with other CyPA structures provide insights into the conformational variability, effects of peptide binding and structure-function relationships of this enzyme.
Collapse
Affiliation(s)
- Elias Christoforides
- Physics Laboratory, Department of Science, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Maria Dimou
- Laboratory of General and Agricultural Microbiology, Department of Biotechnology, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Panagiotis Katinakis
- Laboratory of General and Agricultural Microbiology, Department of Biotechnology, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Kostas Bethanis
- Physics Laboratory, Department of Science, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| | - Michael Karpusas
- Physics Laboratory, Department of Science, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece
| |
Collapse
|
14
|
Dimou M, Venieraki A, Zografou C, Katinakis P. The cytoplasmic cyclophilin from Azotobacter vinelandii interacts with phosphate acetyltransferase isoforms enhancing their in vitro activity. Mol Biol Rep 2011; 39:4135-43. [DOI: 10.1007/s11033-011-1196-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Accepted: 07/11/2011] [Indexed: 11/30/2022]
|