PMID:2494074: Difference between revisions
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|{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2494074 PubMed] | |{{TableHeadingColor}} nowrap |'''Links''' || [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2494074 PubMed] | ||
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Revision as of 22:41, 25 April 2008
Eberhard, M and Kirschner, K (1989) Modification of a catalytically important residue of indoleglycerol-phosphate synthase from Escherichia coli.FEBS Lett. 245:219-22
| Abstract | The active-site residues of indoleglycerol-phosphate synthase from Escherichia coli were tentatively localized by comparing crystallographic data with the amino acid identities among the known indoleglycerol-phosphate synthase sequences. To test the validity of the resulting model of catalysis one of the residues in the presumptive active site, Lys 55, was changed to serine using oligonucleotide-directed mutagenesis. The specificity constant kcat/Km of the mutant is 3 x 10(4)-times lower than that of the wild-type enzyme, due to a 60-fold decrease in kcat and a 450-fold increase in Km. This finding shows that Lys 55 is important for both catalysis and substrate binding. |
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