1rak: Difference between revisions

Revision as of 10:22, 29 July 2008

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File:1rak.png

Template:STRUCTURE 1rak

Bacterial cytosine deaminase D314S mutant bound to 5-fluoro-4-(S)-hydroxyl-3,4-dihydropyrimidine.Bacterial cytosine deaminase D314S mutant bound to 5-fluoro-4-(S)-hydroxyl-3,4-dihydropyrimidine.

Template:ABSTRACT PUBMED 15381761

About this StructureAbout this Structure

1RAK is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

ReferenceReference

Random mutagenesis and selection of Escherichia coli cytosine deaminase for cancer gene therapy., Mahan SD, Ireton GC, Knoeber C, Stoddard BL, Black ME, Protein Eng Des Sel. 2004 Aug;17(8):625-33. Epub 2004 Sep 20. PMID:15381761

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

OCA

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-'''Bacterial cytosine deaminase D314S mutant bound to 5-fluoro-4-(S)-hydroxyl-3,4-dihydropyrimidine.'''
+===Bacterial cytosine deaminase D314S mutant bound to 5-fluoro-4-(S)-hydroxyl-3,4-dihydropyrimidine.===
-==Overview==
+<!--
-Cytosine deaminase (CD) is currently being used as a suicide gene for cancer gene therapy. The premise of this therapy is the preferential deamination of 5-fluorocytosine (5FC) to 5-fluorouracil by cancer cells expressing cytosine deaminase. However, a lack of efficient gene transfer to tumors combined with inefficient 5FC turnover currently limits the clinical applications of this gene therapy approach. We have used random mutagenesis to create novel bacterial cytosine deaminases that demonstrate an increased preference for 5FC over cytosine. Among the 15 mutants isolated, one conferred sensitivity to Escherichia coli in a negative selection system at a concentration of 5FC that was 10-fold lower than a sublethal dose for wild-type CD. Evaluation of individual substitutions found in this double mutant (Q102R, D314G) demonstrated that the substitution at residue D314 was solely responsible for the observed increase in sensitivity to 5FC. Additional mutagenesis at D314 resulted in the identification of two more substitutions with the ability to confer enhanced 5FC sensitivity to E.coli. Structure determinations of the three CD variants in the presence and absence of a transition state 5FC analogue provide insights to the determinants of substrate binding specificity at the 5' position of the pyrimidine ring. CD mutant D314A is a promising candidate for further gene therapy studies.
+The line below this paragraph, {{ABSTRACT_PUBMED_15381761}}, adds the Publication Abstract to the page
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+{{ABSTRACT_PUBMED_15381761}}
 ==About this Structure==
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 [[Category: D314s mutant]]
 [[Category: Hexamer]]
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