1gis
From Proteopedia
OCA (Talk | contribs)
(New page: 200px<br /><applet load="1gis" size="450" color="white" frame="true" align="right" spinBox="true" caption="1gis, resolution 1.7Å" /> '''A TRICHOSANTHIN(TCS) ...)
Next diff →
Revision as of 13:58, 20 November 2007
|
A TRICHOSANTHIN(TCS) MUTANT(E85Q) COMPLEX STRUCTURE WITH 2'-DEOXY-ADENOSIN-5'-MONOPHOSPHATE
Overview
Trichosanthin (TCS) is a type I ribosome-inactivating protein (RIP) which, possesses rRNA N-glycosidase activity. In recent years, its, immunomodulatory, anti-tumor and anti-HIV properties have been revealed., Here we report the crystal structures of several E85 mutant TCS complexes, with adenosine-5'-monophosphate (AMP) and adenine. In E85Q TCS/AMP and, E85A TCS/AMP, near the active site of the molecule and parallel to the, aromatic ring of Tyr70, an AMP molecule is bound to the mutant without, being hydrolyzed. In the E85R TCS/adenine complex, the hydrolyzed product, adenine is located in the active pocket where it occupies a position, similar to that in the TCS/NADPH complex. Significantly, AMP is bound in a, position different to that of adenine. In comparison with these, structures, we suggest that there are at least two subsites in the active, site of TCS, one for initial substrate recognition as revealed by the AMP, site and another for catalysis as represented by the NADPH site. Based on, these complex structures, the function of residue 85 and the mechanism of, catalysis are proposed.
About this Structure
1GIS is a Single protein structure of sequence from Trichosanthes kirilowii with DA as ligand. Active as rRNA N-glycosylase, with EC number 3.2.2.22 Full crystallographic information is available from OCA.
Reference
Substrate binding and catalysis in trichosanthin occur in different sites as revealed by the complex structures of several E85 mutants., Guo Q, Zhou W, Too HM, Li J, Liu Y, Bartlam M, Dong Y, Wong KB, Shaw PC, Rao Z, Protein Eng. 2003 Jun;16(6):391-6. PMID:12874371
Page seeded by OCA on Tue Nov 20 16:05:37 2007
