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PMID:11585365

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Citation

Mansour, CA, Doiron, KM and Cupples, CG (2001) Characterization of functional interactions among the Escherichia coli mismatch repair proteins using a bacterial two-hybrid assay. Mutat. Res. 485:331-8

Abstract

Vsr mediates very short patch repair in Escherichia coli, correcting T/G mismatches caused by deamination of 5-methylcytosine to thymine. MutS and MutL, part of the post-replication mismatch repair system, stimulate VSP repair. In this study, we use a bacterial two-hybrid assay to show that MutL interacts with Vsr. We also show that interaction between Vsr and MutL inhibits the ability of MutL to dimerize, to interact with MutS and MutH and to mediate a previously unknown interaction between MutS and MutH. This inhibition may explain why high levels of Vsr are mutagenic in vivo. In addition, we show that the Mut fusion proteins are repair proficient in the bacterial two-hybrid assay, making it possible to study their interactions in various genetic backgrounds, or in the presence of DNA damaging agents.

Links

PubMed

Keywords

Adenosine Triphosphatases; Bacteria/genetics; Bacterial Proteins/genetics; Bacterial Proteins/metabolism; DNA Damage; DNA Repair; DNA-Binding Proteins; Escherichia coli/metabolism; Escherichia coli Proteins; MutS DNA Mismatch-Binding Protein; Recombinant Fusion Proteins/genetics; Two-Hybrid System Techniques

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:MUTH

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P23367

F

Seeded From UniProt

complete

ECOLI:VSR

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P23367

F

Seeded From UniProt

complete

ECOLI:MUTL

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P06722

F

Seeded From UniProt

complete

ECOLI:MUTL

enables

GO:0005515: protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P09184

F

Seeded From UniProt

complete

ECOLI:MUTL

enables

GO:0042802: identical protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P23367

F

Seeded From UniProt

complete

ECOLI:MUTS

enables

GO:0042802: identical protein binding

ECO:0000353: physical interaction evidence used in manual assertion

UniProtKB:P23909

F

Seeded From UniProt

complete

See also

References

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