1gsi

CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS THYMIDYLATE KINASE COMPLEXED WITH THYMIDINE MONOPHOSPHATE (TMP)

spinqualitylabelsall models 1gsi, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1gsi is a 1 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.6Å Ligands: ACT, MG, SO4, TMP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function KTHY_MYCTU Catalyzes the reversible phosphorylation of deoxythymidine monophosphate (dTMP) to deoxythymidine diphosphate (dTDP), using ATP as its preferred phosphoryl donor. Situated at the junction of both de novo and salvage pathways of deoxythymidine triphosphate (dTTP) synthesis, is essential for DNA synthesis and cellular growth. Has a broad specificity for nucleoside triphosphates, being highly active with ATP or dATP as phosphate donors, and less active with ITP, GTP, CTP and UTP.[HAMAP-Rule:MF_00165] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Caged compounds in combination with protein crystallography represent a valuable tool in studies of enzyme reaction intermediates. To date, photochemical triggering of reactions has been performed close to room temperature. Synchronous reaction initiation has only been achieved with enzymes of relatively slow turnover (<0.1 s(-1)) and caged compounds of high quantum yield. Here X-ray crystallography and microspectrophotometry were used to provide evidence that (nitrophenyl)ethyl (NPE) ester bonds can be photolyzed by UV light at cryotemperatures. NPE-caged ATP in flash-cooled crystals of Mycobacterium tuberculosis thymidylate kinase was photolyzed successfully at 100-150 K as assessed by the structural observation of ATP-dependent enzymatic conversion of TMP to TDP after temporarily warming the crystals to room temperature. A new method is proposed in which cryo-photolysis combined with temperature-controlled protein crystallography can be used to trap reaction intermediates even in some of the fastest enzymes and/or when only compounds of low quantum yield are available. Raising the temperature after cryophotolysis may allow a transition barrier to be passed and an intermediate to accumulate in the crystal. A comparable method has only been used so far with proteins displaying endogenous photosensitivity. The approach described here opens the way to studying the reaction mechanisms of a much larger number of crystalline enzymes. Furthermore, it is shown that X-ray-induced radiolysis of caged compounds occurs if high-intensity synchrotron beamlines are used. This caveat should be taken into account when deriving data-collection protocols. It could also be used potentially as a way to trigger reactions. Cryophotolysis of caged compounds: a technique for trapping intermediate states in protein crystals.,Ursby T, Weik M, Fioravanti E, Delarue M, Goeldner M, Bourgeois D Acta Crystallogr D Biol Crystallogr. 2002 Apr;58(Pt 4):607-14. Epub 2002, Mar 22. PMID:11914484 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Thymidylate kinase 3D structures

Proteopedia Page Contributors and Editors (what is this?)

OCA