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'''CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS THYMIDYLATE KINASE COMPLEXED WITH DEOXYTHYMIDINE (DT) (2.1 A RESOLUTION)''' | '''CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS THYMIDYLATE KINASE COMPLEXED WITH DEOXYTHYMIDINE (DT) (2.1 A RESOLUTION)''' | ||
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[[Category: Mycobacterium tuberculosis]] | [[Category: Mycobacterium tuberculosis]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: | [[Category: DTMP kinase]] | ||
[[Category: Adam, V.]] | [[Category: Adam, V.]] | ||
[[Category: Bourgeois, D.]] | [[Category: Bourgeois, D.]] | ||
[[Category: Fioravanti, E.]] | [[Category: Fioravanti, E.]] | ||
[[Category: Munier-Lehmann, H.]] | [[Category: Munier-Lehmann, H.]] | ||
[[Category: | [[Category: Azt]] | ||
[[Category: | [[Category: Crystal structure]] | ||
[[Category: | [[Category: Inhibition mechanism]] | ||
[[Category: | [[Category: Mycobacterium tuberculosis]] | ||
[[Category: | [[Category: Thymidylate kinase]] | ||
[[Category: | [[Category: Transferase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:03:40 2008'' | |||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | |||
Revision as of 13:03, 3 May 2008
CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS THYMIDYLATE KINASE COMPLEXED WITH DEOXYTHYMIDINE (DT) (2.1 A RESOLUTION)
OverviewOverview
Tuberculosis (TB) is the primary cause of mortality among infectious diseases. Mycobacterium tuberculosis thymidylate kinase (TMPK(Mtub)) catalyzes the ATP-dependent phosphorylation of deoxythymidine 5'-monophosphate (dTMP). Essential to DNA replication, this enzyme represents a promising target for developing new drugs against TB, because the configuration of its active site is unique within the TMPK family. Indeed, it has been proposed that, as opposed to other TMPKs, catalysis by TMPK(Mtub) necessitates the transient binding of a magnesium ion coordinating the phosphate acceptor. Moreover, 3'-azidodeoxythymidine monophosphate (AZTMP) is a competitive inhibitor of TMPK(Mtub), whereas it is a substrate for human and other TMPKs. Here, the crystal structures of TMPK(Mtub) in complex with deoxythymidine (dT) and AZTMP were determined to 2.1 and 2.0 A resolution, respectively, and suggest a mechanism for inhibition. The azido group of AZTMP perturbs the induced-fit mechanism normally adopted by the enzyme. Magnesium is prevented from binding, and the resulting electrostatic environment precludes phosphoryl transfer from occurring. Our data provide a model for drug development against tuberculosis.
About this StructureAbout this Structure
1W2G is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.
ReferenceReference
The crystal structure of Mycobacterium tuberculosis thymidylate kinase in complex with 3'-azidodeoxythymidine monophosphate suggests a mechanism for competitive inhibition., Fioravanti E, Adam V, Munier-Lehmann H, Bourgeois D, Biochemistry. 2005 Jan 11;44(1):130-7. PMID:15628853 Page seeded by OCA on Sat May 3 13:03:40 2008