1e9c

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|PDB= 1e9c |SIZE=350|CAPTION= <scene name='initialview01'>1e9c</scene>, resolution 1.6&Aring;
|PDB= 1e9c |SIZE=350|CAPTION= <scene name='initialview01'>1e9c</scene>, resolution 1.6&Aring;
|SITE= <scene name='pdbsite=TMP:Anp+Binding+Site'>TMP</scene>
|SITE= <scene name='pdbsite=TMP:Anp+Binding+Site'>TMP</scene>
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|LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TMP:THYMIDINE-5'-PHOSPHATE'>TMP</scene> and <scene name='pdbligand=ADP:ADENOSINE-5'-DIPHOSPHATE'>ADP</scene>
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|LIGAND= <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TMP:THYMIDINE-5&#39;-PHOSPHATE'>TMP</scene> and <scene name='pdbligand=ADP:ADENOSINE-5&#39;-DIPHOSPHATE'>ADP</scene>
|ACTIVITY= [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]
|ACTIVITY= [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]
|GENE=
|GENE=
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[[Category: thymidylate kinase]]
[[Category: thymidylate kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:52:02 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 23 11:37:34 2008''

Revision as of 09:37, 23 March 2008

Image:1e9c.jpg


PDB ID 1e9c

Drag the structure with the mouse to rotate
, resolution 1.6Å
Sites:
Ligands: , and
Activity: dTMP kinase, with EC number 2.7.4.9
Coordinates: save as pdb, mmCIF, xml



MUTANT HUMAN THYMIDYLATE KINASE COMPLEXED WITH TMP AND APPNP


Overview

The 60-fold reduced phosphorylation rate of azidothymidine (AZT) monophosphate (AZTMP), the partially activated AZT metabolite, by human thymidylate kinase (TMPK) severely limits the efficacy of this anti-HIV prodrug. Crystal structures of different TMPK nucleotide complexes indicate that steric hindrance by the azido group of AZTMP prevents formation of the catalytically active closed conformation of the P-loop of TMPK. The F105Y mutant and a chimeric mutant that contains sequences of the human and Escherichia coli enzyme phosphorylate AZTMP 20-fold faster than the wild-type enzyme. The structural basis of the increased activity is assigned to stabilization of the closed P-loop conformation.

About this Structure

1E9C is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Potentiating AZT activation: structures of wild-type and mutant human thymidylate kinase suggest reasons for the mutants' improved kinetics with the HIV prodrug metabolite AZTMP., Ostermann N, Lavie A, Padiyar S, Brundiers R, Veit T, Reinstein J, Goody RS, Konrad M, Schlichting I, J Mol Biol. 2000 Nov 17;304(1):43-53. PMID:11071809

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