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| - | [[Image:1ay9.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1ay9| PDB=1ay9 | SCENE= }} | | {{STRUCTURE_1ay9| PDB=1ay9 | SCENE= }} |
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| - | '''WILD-TYPE UMUD' FROM E. COLI'''
| + | ===WILD-TYPE UMUD' FROM E. COLI=== |
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| - | ==Overview==
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| - | 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'.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_8994967}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 8994967 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_8994967}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Hydrolase]] | | [[Category: Hydrolase]] |
| | [[Category: Mutagenesis protein]] | | [[Category: Mutagenesis protein]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:50:21 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 17:50:58 2008'' |
Revision as of 14:51, 30 June 2008
Template:STRUCTURE 1ay9
WILD-TYPE UMUD' FROM E. COLI
Template:ABSTRACT PUBMED 8994967
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
Page seeded by OCA on Mon Jun 30 17:50:58 2008
