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© Institut Pasteur
Cristaux de cellulase, enzyme purifiée de Clostridium thermocellum permettant la digestion de la cellulose. Image colorisée.
Publication : Nucleic acids research

Structural and functional characterization of the Mycobacterium tuberculosis uridine monophosphate kinase: insights into the allosteric regulation

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Nucleic acids research - 10 Dec 2010

Labesse G, Benkali K, Salard-Arnaud I, Gilles AM, Munier-Lehmann H

Link to Pubmed [PMID] – 21149268

Nucleic Acids Res. 2011 Apr;39(8):3458-72

Nucleoside Monophosphate Kinases (NMPKs) family are key enzymes in nucleotide metabolism. Bacterial UMPKs depart from the main superfamily of NMPKs. Having no eukaryotic counterparts they represent attractive therapeutic targets. They are regulated by GTP and UTP, while showing different mechanisms in Gram(+), Gram(-) and archaeal bacteria. In this work, we have characterized the mycobacterial UMPK (UMPKmt) combining enzymatic and structural investigations with site-directed mutagenesis. UMPKmt exhibits cooperativity toward ATP and an allosteric regulation by GTP and UTP. The crystal structure of the complex of UMPKmt with GTP solved at 2.5 Å, was merely identical to the modelled apo-form, in agreement with SAXS experiments. Only a small stretch of residues was affected upon nucleotide binding, pointing out the role of macromolecular dynamics rather than major structural changes in the allosteric regulation of bacterial UMPKs. We further probe allosteric regulation by site-directed mutagenesis. In particular, a key residue involved in the allosteric regulation of this enzyme was identified.

http://www.ncbi.nlm.nih.gov/pubmed/21149268