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Comparison of Inhibitor and Substrate Selectivity between Rodent and Human Vascular Adhesion Protein-1. Mediators Inflamm 2020; 2020:3270513. [PMID: 32410850 PMCID: PMC7201828 DOI: 10.1155/2020/3270513] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 11/27/2019] [Accepted: 12/20/2019] [Indexed: 11/18/2022] Open
Abstract
Vascular adhesion protein-1 (VAP-1) is an ectoenzyme that functions as a copper-containing amine oxidase and is involved in leukocyte adhesion at sites of inflammation. Inhibition of VAP-1 oxidative deamination has become an attractive target for anti-inflammatory therapy with demonstrated efficacy in rodent models of inflammation. A previous comparison of purified recombinant VAP-1 from mouse, rat, monkey, and human gene sequences predicted that rodent VAP-1 would have higher affinity for smaller hydrophilic substrates/inhibitors because of its narrower and more hydrophilic active site channel. An optimized in vitro oxidative deamination fluorescence assay with benzylamine (BA) was used to compare inhibition of five known inhibitors in recombinant mouse, rat, and human VAP-1. Human VAP-1 was more sensitive compared to rat or mouse VAP-1 (lowest IC50 concentration) to semicarbazide but was least sensitive to hydralazine and LJP-1207. Hydralazine had a lower IC50 in rats compared to humans, although not significant. However, the IC50 of hydralazine was significantly higher in the rat compared to mouse VAP-1. The larger hydrophobic compounds from Astellas (compound 35c) and Boehringer Ingelheim (PXS-4728A) were hypothesized to have higher binding affinity for human VAP-1 compared to rodent VAP-1 since the channel in human VAP-1 is larger and more hydrophobic than that in rodent VAP-1. Although the sensitivity of these two inhibitors was the lowest in the mouse enzyme, we found no significant differences between mouse, rat, and human VAP-1. Michaelis-Menten kinetics of the small primary amines phenylethylamine and tyramine were also compared to the common marker substrate BA demonstrating that BA had the highest affinity among the substrates. Rat VAP-1 had the highest affinity for all three substrates and mouse VAP-1 had intermediate affinity for BA and phenylethylamine, but tyramine was not a substrate for mouse VAP-1 under these assay conditions. These results suggest that comparing oxidative deamination in mouse and rat VAP-1 may be important if using these species for preclinical efficacy models.
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Repessé X, Moldes M, Muscat A, Vatier C, Chetrite G, Gille T, Planes C, Filip A, Mercier N, Duranteau J, Fève B. Hypoxia inhibits semicarbazide-sensitive amine oxidase activity in adipocytes. Mol Cell Endocrinol 2015; 411:58-66. [PMID: 25907140 DOI: 10.1016/j.mce.2015.04.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 04/13/2015] [Accepted: 04/13/2015] [Indexed: 11/17/2022]
Abstract
Semicarbazide-sensitive amine oxidase (SSAO), an enzyme highly expressed on adipocyte plasma membranes, converts primary amines into aldehydes, ammonium and hydrogen peroxide, and is likely involved in endothelial damage during the course of diabetes and obesity. We investigated whether in vitro, adipocyte SSAO was modulated under hypoxic conditions that is present in adipose tissue from obese or intensive care unit. Physical or pharmacological hypoxia decreased SSAO activity in murine adipocytes and human adipose tissue explants, while enzyme expression was preserved. This effect was time-, dose-dependent and reversible. This down-regulation was confirmed in vivo in subcutaneous adipose tissue from a rat model of hypoxia. Hypoxia-induced suppression in SSAO activity was independent of the HIF-1-α pathway or of oxidative stress, but was partially antagonized by medium acidification. Hypoxia-induced down-regulation of SSAO activity could represent an adaptive mechanism to lower toxic molecules production, and may thus protect from tissue injury during these harmful conditions.
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Affiliation(s)
- Xavier Repessé
- UMR S_1185, INSERM, Université Paris-Sud, Le Kremlin-Bicêtre, France; Service de Réanimation Médico-Chirurgicale, pôle Thorax-Vaisseaux-Abdomen-Métabolisme, Hôpital Ambroise Paré, Assistance Publique-Hôpitaux de Paris, Boulogne-Billancourt, France.
| | - Marthe Moldes
- Centre de Recherche Saint-Antoine, INSERM, UMR S_938, Sorbonne Universités, Université Paris 6, Paris, France; Institut Hospitalo-Universitaire ICAN, Paris, France
| | - Adeline Muscat
- UMR S_1185, INSERM, Université Paris-Sud, Le Kremlin-Bicêtre, France; Centre de Recherche Saint-Antoine, INSERM, UMR S_938, Sorbonne Universités, Université Paris 6, Paris, France; Institut Hospitalo-Universitaire ICAN, Paris, France
| | - Camille Vatier
- Centre de Recherche Saint-Antoine, INSERM, UMR S_938, Sorbonne Universités, Université Paris 6, Paris, France; Institut Hospitalo-Universitaire ICAN, Paris, France; Service d'Endocrinologie, Hôpital Saint-Antoine, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Gérard Chetrite
- UMR S_1185, INSERM, Université Paris-Sud, Le Kremlin-Bicêtre, France; Centre de Recherche Saint-Antoine, INSERM, UMR S_938, Sorbonne Universités, Université Paris 6, Paris, France; Institut Hospitalo-Universitaire ICAN, Paris, France; Service d'Endocrinologie, Hôpital Saint-Antoine, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Thomas Gille
- Université Paris 13, Sorbonne Paris Cité, EA2363 Bobigny, France; Service d'Explorations Fonctionnelles, Hôpital Avicenne, Assistance Publique-Hôpitaux de Paris, Bobigny, France
| | - Carole Planes
- Université Paris 13, Sorbonne Paris Cité, EA2363 Bobigny, France; Service d'Explorations Fonctionnelles, Hôpital Avicenne, Assistance Publique-Hôpitaux de Paris, Bobigny, France
| | - Anna Filip
- INSERM U1116, Faculté de Médecine, Vandoeuvre-les-Nancy, France
| | - Nathalie Mercier
- INSERM U1116, Faculté de Médecine, Vandoeuvre-les-Nancy, France; Université de Lorraine, Nancy, France
| | - Jacques Duranteau
- Service d'Anesthésie-Réanimation, Hôpital Bicêtre, Assistance Publique-Hôpitaux de Paris, Le Kremlin-Bicêtre, France; Microcirculation, Bioénergétique, Inflammation et Insuffisance Circulatoire Aigue, Equipe Universitaire 3509, Paris VII-Paris XI-Paris XIII, Paris, France
| | - Bruno Fève
- UMR S_1185, INSERM, Université Paris-Sud, Le Kremlin-Bicêtre, France; Centre de Recherche Saint-Antoine, INSERM, UMR S_938, Sorbonne Universités, Université Paris 6, Paris, France; Institut Hospitalo-Universitaire ICAN, Paris, France; Service d'Endocrinologie, Hôpital Saint-Antoine, Assistance Publique-Hôpitaux de Paris, Paris, France
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Sun Y, Song H, Li J, Li Y, Jiang M, Zhou J, Guo Z. Structural basis of the induced-fit mechanism of 1,4-dihydroxy-2-naphthoyl coenzyme A synthase from the crotonase fold superfamily. PLoS One 2013; 8:e63095. [PMID: 23658663 PMCID: PMC3637252 DOI: 10.1371/journal.pone.0063095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Accepted: 03/28/2013] [Indexed: 01/25/2023] Open
Abstract
1, 4-Dihydroxy-2-naphthoyl coenzyme A (DHNA-CoA) synthase is a typical crotonase fold enzyme with an implicated role of conformational changes in catalysis. We have identified these conformational changes by determining the structures of its Escherichia coli and Synechocystis sp. PCC6803 orthologues in complex with a product analog. The structural changes include the folding of an active-site loop into a β-hairpin and significant reorientation of a helix at the carboxy terminus. Interestingly, a new interface is formed between the ordered loop and the reoriented helix, both of which also form additional interactions with the coenzyme A moiety of the ligand. Site-directed mutation of the amino acid residues involved in these ligand-induced interactions significantly diminishes the enzyme activity. These results suggest a catalytically essential induced-fit that is likely initiated by the enzyme-ligand interactions at the active site.
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Affiliation(s)
- Yueru Sun
- Department of Chemistry and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Haigang Song
- Department of Chemistry and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Jie Li
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Yan Li
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
| | - Ming Jiang
- Department of Chemistry and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Jiahai Zhou
- State Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China
- * E-mail: (ZG); (JZ)
| | - Zhihong Guo
- Department of Chemistry and State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
- * E-mail: (ZG); (JZ)
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Jiang M, Chen M, Guo ZF, Guo Z. A bicarbonate cofactor modulates 1,4-dihydroxy-2-naphthoyl-coenzyme a synthase in menaquinone biosynthesis of Escherichia coli. J Biol Chem 2010; 285:30159-69. [PMID: 20643650 DOI: 10.1074/jbc.m110.147702] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
1,4-Dihydroxy-2-naphthoyl coenzyme A (DHNA-CoA) synthase is a typical crotonase-fold protein catalyzing an intramolecular Claisen condensation in the menaquinone biosynthetic pathway. We have characterized this enzyme from Escherichia coli and found that it is activated by bicarbonate in a concentration-dependent manner. The bicarbonate binding site has been identified in the crystal structure of a virtually identical ortholog (96.8% sequence identity) from Salmonella typhimurium through comparison with a bicarbonate-insensitive orthologue. Kinetic properties of the enzyme and its site-directed mutants of the bicarbonate binding site indicate that the exogenous bicarbonate anion is essential to the enzyme activity. With this essential catalytic role, the simple bicarbonate anion is an enzyme cofactor, which is usually a small organic molecule derived from vitamins, a metal ion, or a metal-containing polyatomic anionic complex. This finding leads to classification of the DHNA-CoA synthases into two evolutionarily conserved subfamilies: type I enzymes that are bicarbonate-dependent and contain a conserved glycine at the bicarbonate binding site; and type II enzymes that are bicarbonate-independent and contain a conserved aspartate at the position similar to the enzyme-bound bicarbonate. In addition, the unique location of the enzyme-bound bicarbonate allows it to be proposed as a catalytic base responsible for abstraction of the α-proton of the thioester substrate in the enzymatic reaction, suggesting a unified catalytic mechanism for all DHNA-CoA synthases.
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Affiliation(s)
- Ming Jiang
- Department of Chemistry, State Key Laboratory of Molecular Neuroscience, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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