1g3u: Difference between revisions

Revision as of 17:06, 2 May 2008

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

OverviewOverview

The X-ray structure of Mycobacterium tuberculosis TMP kinase at 1.95 A resolution is described as a binary complex with its natural substrate TMP. Its main features involve: (i) a clear magnesium-binding site; (ii) an alpha-helical conformation for the so-called LID region; and (iii) a high density of positive charges in the active site. There is a network of interactions involving highly conserved side-chains of the protein, the magnesium ion, a sulphate ion mimicking the beta phosphate group of ATP and the TMP molecule itself. All these interactions conspire in stabilizing what appears to be the closed form of the enzyme. A complete multialignment of all (32) known sequences of TMP kinases is presented. Subtle differences in the TMP binding site were noted, as compared to the Escherichia coli, yeast and human enzyme structures, which have been reported recently. These differences could be used to design specific inhibitors of this essential enzyme of nucleotide metabolism. Two cases of compensatory mutations were detected in the TMP binding site of eukaryotic and prokaryotic enzymes. In addition, an intriguing high value of the electric field is reported in the vicinity of the phosphate group of TMP and the putative binding site of the gamma phosphate group of ATP.

About this StructureAbout this Structure

1G3U is a Single protein structure of sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA.

ReferenceReference

X-ray structure of TMP kinase from Mycobacterium tuberculosis complexed with TMP at 1.95 A resolution., Li de la Sierra I, Munier-Lehmann H, Gilles AM, Barzu O, Delarue M, J Mol Biol. 2001 Aug 3;311(1):87-100. PMID:11469859 Page seeded by OCA on Fri May 2 17:06:17 2008

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

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 [[Image:1g3u.jpg|left|200px]]
- {{Structure
+<!--
-|PDB= 1g3u |SIZE=350|CAPTION= <scene name='initialview01'>1g3u</scene>, resolution 1.95&Aring;
+The line below this paragraph, containing "STRUCTURE_1g3u", creates the "Structure Box" on the page.
-|SITE=
+You may change the PDB parameter (which sets the PDB file loaded into the applet)
-|LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=TMP:THYMIDINE-5&#39;-PHOSPHATE'>TMP</scene>
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/dTMP_kinase dTMP kinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.4.9 2.7.4.9] </span>
+or leave the SCENE parameter empty for the default display.
-|GENE=
+-->
-|DOMAIN=
+{{STRUCTURE_1g3u|  PDB=1g3u  |  SCENE=  }}
-|RELATEDENTRY=
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1g3u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1g3u OCA], [http://www.ebi.ac.uk/pdbsum/1g3u PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1g3u RCSB]</span>
-}}
 '''CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS THYMIDYLATE KINASE COMPLEXED WITH THYMIDINE MONOPHOSPHATE (TMP)'''
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 [[Category: Mycobacterium tuberculosis]]
 [[Category: Single protein]]
-[[Category: dTMP kinase]]
+[[Category: DTMP kinase]]
 [[Category: Barzu, O.]]
 [[Category: Delarue, M.]]
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 [[Category: Munier-Lehmann, H.]]
 [[Category: Sierra, I Li de la.]]
-[[Category: kinase]]
+[[Category: Kinase]]
-[[Category: transferase (atp:tmp phosphotransferase)]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 17:06:17 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:36:05 2008''