γ-Glutamyl transpeptidase architecture: Effect of extra sequence deletion on autoprocessing, structure and stability of the protein from Bacillus licheniformis
γ-Glutamyl transpeptidase architecture: Effect of extra sequence deletion on autoprocessing, structure and stability of the protein from Bacillus licheniformis(492 views) Chi M-C, Lo Y-H, Chen Y-Y, Lin L-L, Merlino A
Department of Applied Chemistry, National Chiayi University, 300 Syuefu RoadChiayi City, Taiwan
Department of Chemical Sciences, University of Naples Federico IINapoli, Italy
Istituto di Biostrutture e Bioimmagini, CNRNapoli, Italy
References: Not available.
γ-Glutamyl transpeptidase architecture: Effect of extra sequence deletion on autoprocessing, structure and stability of the protein from Bacillus licheniformis
γ-Glutamyl transpeptidases (γ-GTs, EC 2.3.2.2) are a class of ubiquitous enzymes which initiate the cleavage of extracellular glutathione (γ-Glu-Cys-Gly, GSH) into its constituent glutamate, cysteine, and glycine and catalyze the transfer of its γ-glutamyl group to water (hydrolysis), amino acids or small peptides (transpeptidation). These proteins utilize a conserved Thr residue to process their chains into a large and a small subunit that then form the catalytically competent enzyme. Multiple sequence alignments have shown that some bacterial γ-GTs, including that from Bacillus licheniformis (BlGT), possess an extra sequence at the C-terminal tail of the large subunit, whose role is unknown. Here, autoprocessing, structure, catalytic activity and stability against both temperature and the chemical denaturant guanidinium hydrochloride of six BlGT extra-sequence deletion mutants have been characterized by SDS-PAGE, circular dichroism, intrinsic fluorescence and homology modeling. Data suggest that the extra sequence has a crucial role in enzyme activation and structural stability. Our results assist in the development of a structure-based interpretation of the autoprocessing reaction of γ-GTs and are helpful to unveil the molecular bases of their structural stability.
γ-Glutamyl transpeptidase architecture: Effect of extra sequence deletion on autoprocessing, structure and stability of the protein from Bacillus licheniformis
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γ-Glutamyl transpeptidase architecture: Effect of extra sequence deletion on autoprocessing, structure and stability of the protein from Bacillus licheniformis
Aloj L, Aurilio M, Rinaldi V, D'Ambrosio L, Tesauro D, Peitl PK, Maina T, Mansi R, Von Guggenberg E, Joosten L, Sosabowski JK, Breeman WA, De Blois E, Koelewijn S, Melis M, Waser B, Beetschen K, Reubi JC, De Jong M * The EEE project(532 views) Proc Int Cosm Ray Conf Icrc Universidad Nacional Autonoma De Mexico, 2007; 5(HEPART2): 977-980. Impact Factor:0 ViewExport to BibTeXExport to EndNote