Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Pivot Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Target Concepts:
Gene/Protein
Disease
Symptom
Drug
Enzyme
Compound
Query: EC:5.99.1.3 (
topoisomerase
)
9,911
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
The MutL
DNA mismatch repair protein
has recently been shown to be an ATPase and to belong to an emerging ATPase superfamily that includes
DNA topoisomerase II
and Hsp90. We report here the crystal structures of a 40 kDa ATPase fragment of E. coli MutL (LN40) complexed with a substrate analog, ADPnP, and with product ADP. More than 60 residues that are disordered in the apoprotein structure become ordered and contribute to both ADPnP binding and dimerization of LN40. Hydrolysis of ATP, signified by subsequent release of the gamma-phosphate, releases two key loops and leads to dissociation of the LN40 dimer. Dimerization of the LN40 region is required for and is the rate-limiting step in ATP hydrolysis by MutL. The ATPase activity of MutL is stimulated by DNA and likely acts as a switch to coordinate DNA mismatch repair.
...
PMID:Transformation of MutL by ATP binding and hydrolysis: a switch in DNA mismatch repair. 1019 5
