Mutations in the Escherichia coli surE gene increase isoaspartyl accumulation in a strain lacking the pcm repair methyltransferase but suppress stress-survival phenotypes.
The Escherichia coli surE gene is co-transcribed with pcm, encoding the L-isoaspartyl protein repair methyltransferase, and is highly conserved among both the Eubacteria and the Archaea; however, no biochemical function has yet been identified for this gene. Isoaspartyl accumulation during stationary phase was much higher in a pcm surE double mutant than in either single mutant, suggesting that the two genes may represent two parallel pathways by which E. coli can respond to protein damage. A null mutation in surE also suppressed stress-survival defects previously observed in a pcm mutant strain, providing further evidence for an interaction between the two gene products.
Visick
J E
JE
Department of Chemistry and Biochemistry, University of California, Los Angeles 90095-1569, USA.
Ichikawa
J K
JK
Clarke
S
S
D000135:Acid Phosphatase; D001224:Aspartic Acid / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D009154:Mutation; D010641:Phenotype; D010802:Phylogeny; D026601:Protein D-Aspartate-L-Isoaspartate Methyltransferase; D011496:Protein Methyltransferases / Q000235:genetics* / Q000378:metabolism*
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D001224:Aspartic Acid; D011496:Protein Methyltransferases; D026601:Protein D-Aspartate-L-Isoaspartate Methyltransferase; D000135:Acid Phosphatase; C089634:umpG protein, E coli