1ay9
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(New page: 200px<br /><applet load="1ay9" size="450" color="white" frame="true" align="right" spinBox="true" caption="1ay9, resolution 3.0Å" /> '''WILD-TYPE UMUD' FROM ...)
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Revision as of 09:04, 20 November 2007
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WILD-TYPE UMUD' FROM E. COLI
Overview
BACKGROUND: Damage induced 'SOS mutagenesis' may occur transiently as part, of the global SOS response to DNA damage in bacteria. A key participant in, this process is the UmuD protein, which is produced in an inactive from, but converted to the active form, UmuD', by a RecA-mediated self-cleavage, reaction. UmuD', together with UmuC and activated RecA (RecA*), enables, the DNA polymerase III holoenzyme to replicate across chemical and UV, induced lesions. The efficiency of this reaction depends on several, intricate protein-protein interactions. RESULTS: Recent X-ray, crystallographic analysis shows that in addition to forming molecular, dimers, the N- and C-terminal tails of UmuD' extend from a globular beta, structure to associate and produce crystallized filaments. We have, investigated this phenomenon and find that these filaments appear to, relate to biological activity. Higher order oligomers are found in, solution with UmuD', but not with UmuD nor with a mutant of UmuD' lacking, the extended N terminus. Deletion of the N terminus of UmuD' does not, affect its ability to form molecular dimers but does severely compromise, its ability to interact with a RecA-DNA filament and to participate in, mutagenesis. Mutations in the C terminus of UmuD' result in both gain and, loss of function for mutagenesis. CONCLUSIONS: The activation of UmuD to, UmuD' appears to cause a large conformational change in the protein which, allows it to form oligomers in solution at physiologically relevant, concentrations. Properties of these oligomers are consistent with the, filament structures seen in crystals of UmuD'.
About this Structure
1AY9 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
The UmuD' protein filament and its potential role in damage induced mutagenesis., Peat TS, Frank EG, McDonald JP, Levine AS, Woodgate R, Hendrickson WA, Structure. 1996 Dec 15;4(12):1401-12. PMID:8994967
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