1m6j
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(New page: 200px<br /><applet load="1m6j" size="450" color="white" frame="true" align="right" spinBox="true" caption="1m6j, resolution 1.50Å" /> '''CRYSTAL STRUCTURE OF...)
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Revision as of 19:03, 20 November 2007
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CRYSTAL STRUCTURE OF TRIOSEPHOSPHATE ISOMERASE FROM ENTAMOEBA HISTOLYTICA
Overview
Triosephosphate isomerase (TIM) has been proposed as a target for drug, design. TIMs from several parasites have a cysteine residue at the dimer, interface, whose derivatization with thiol-specific reagents induces, enzyme inactivation and aggregation. TIMs lacking this residue, such as, human TIM, are less affected. TIM from Entamoeba histolytica (EhTIM) has, the interface cysteine residue and presents more than ten insertions when, compared with the enzyme from other pathogens. To gain further insight, into the role that interface residues play in the stability and reactivity, of these enzymes, we determined the high-resolution structure and, characterized the effect of methylmethane thiosulfonate (MMTS) on the, activity and conformational properties of EhTIM. The structure of this, enzyme was determined at 1.5A resolution using molecular replacement, observing that the dimer is not symmetric. EhTIM is completely inactivated, by MMTS, and dissociated into stable monomers that possess considerable, secondary structure. Structural and spectroscopic analysis of EhTIM and, comparison with TIMs from other pathogens reveal that conformational, rearrangements of the interface after dissociation, as well as, intramonomeric contacts formed by the inserted residues, may contribute to, the unusual stability of the derivatized EhTIM monomer.
About this Structure
1M6J is a Single protein structure of sequence from Entamoeba histolytica. Active as Triose-phosphate isomerase, with EC number 5.3.1.1 Full crystallographic information is available from OCA.
Reference
Structure and inactivation of triosephosphate isomerase from Entamoeba histolytica., Rodriguez-Romero A, Hernandez-Santoyo A, del Pozo Yauner L, Kornhauser A, Fernandez-Velasco DA, J Mol Biol. 2002 Sep 27;322(4):669-75. PMID:12270704
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