Article (Scientific journals)
The Three-Dimensional Structure of VIM-2, a Zn-β-Lactamase from Pseudomonas aeruginosa in Its Reduced and Oxidised Form
Garcia-Saez, I.; Docquier, Jean-Denis; Rossolini, G. M. et al.
2008In Journal of Molecular Biology, 375 (3), p. 604-611
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Keywords :
Pseudomonas aeruginosa
Abstract :
[en] The crystal structures of the universally widespread metallo-β-lactamase (MBL) Verona integron-encoded MBL (VIM)-2 from Pseudomonas aeruginosa have been solved in their native form as well as in an unexpected oxidised form. This carbapenem-hydrolysing enzyme belongs to the so-called B1 subfamily of MBLs and shares the folding of αβ/βα sandwich, consisting of a core of β-sheet surrounded by α-helices. Surprisingly, it showed a high tendency to be strongly oxidised at the catalytic cysteine located in the Cys site, Cys221, which, in the oxidised structure, becomes a cysteinesulfonic residue. Its native structure was obtained only in the presence of Tris(2-carboxyethyl)phosphine. This oxidation might be a consequence of a lower affinity for the second Zn located in the Cys site that would also explain the observed susceptibility of VIM-2 to chelating agents. This modification, if present in nature, might play a role in catalytic down-regulation. Comparison between native and oxidised VIM-2 and a predicted model of VIM-1 (which shows one residue different in the Cys site compared with VIM-2) is performed to explain the different activities and antibiotic specificities. © 2007 Elsevier Ltd. All rights reserved.
Disciplines :
Biochemistry, biophysics & molecular biology
Microbiology
Author, co-author :
Garcia-Saez, I.;  Laboratoire de Cristallographie Macromoléculaire, Institut de Biologie Structurale Jean-Pierre Ebel, CNRS-Commissariat à l'Energie Atomique (CEA)-Université Joseph Fourier, 41 rue Jules Horowitz, F-38027 Grenoble Cedex 1, France
Docquier, Jean-Denis ;  Université de Liège - ULiège > Département des sciences de la vie > Centre d'ingénierie des protéines
Rossolini, G. M.;  Dipartimento di Biologia Molecolare, Sezione di Microbiologia, Università degli Studi di Siena, I-53100 Siena, Italy
Dideberg, O.;  Laboratoire de Cristallographie Macromoléculaire, Institut de Biologie Structurale Jean-Pierre Ebel, CNRS-Commissariat à l'Energie Atomique (CEA)-Université Joseph Fourier, 41 rue Jules Horowitz, F-38027 Grenoble Cedex 1, France
Language :
English
Title :
The Three-Dimensional Structure of VIM-2, a Zn-β-Lactamase from Pseudomonas aeruginosa in Its Reduced and Oxidised Form
Publication date :
2008
Journal title :
Journal of Molecular Biology
ISSN :
0022-2836
eISSN :
1089-8638
Publisher :
Academic Press
Volume :
375
Issue :
3
Pages :
604-611
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
HPRN-CT-2002-00264
Available on ORBi :
since 23 November 2020

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