Testimony of the Correlation Between the Reactive Histidine Residue and the Arginase Catalytic Mechanism Using a Biochromatographic Concept and Mutagenesis Experiments |
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Authors: | Claire André Teddy Bagnost Samuel Limat Tijani Gharbi Yves Claude Guillaume |
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Affiliation: | 1. Equipe Sciences Séparatives Biologique et Pharmaceutiques (2SBP/EA-4267), Laboratoire de Chimie Analytique, Faculté de Médecine et de Pharmacie, Université de Franche-Comté, Place St. Jacques, 25030, Besan?on Cedex, France 2. LOPMD, FEMTO-ST Institute, UMR CNRS 6174, Université de Franche-Comté, 16 route de Gray, 25030, Besan?on Cedex, France
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Abstract: | In a previous paper (Bagnost et al., J Chromatogr B Analyt Technol Biomed Life Sci 853:38–46, 2007), an arginase chromatographic support was developed to study the association mechanism of arginase (an enzyme which can reduce endothelial dysfunction and blood pressure rising in spontaneously hypertensive rats) with nor-NOHA a potential inhibitor of its activity. In this report mutagenesis experiments associated with this biochromatographic approach confirmed that the active-site residue Hist 141 is protonated as imidazolium cation. Hist 141 could function as a general acid to protonate the leaving amino group of l-ornithine during catalysis. |
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