Abstract
The Msh2-Msh6 heterodimer plays a key role in the repair of mispaired bases in DNA. Critical to its role in mismatch repair is the ATPase activity that resides within each subunit. Here we show that both subunits can simultaneously bind ATP and identify the Msh6 subunit as containing the high-affinity ATP binding site and Msh2 as containing a high-affinity ADP binding site. Stable binding of ATP to Msh6 causes decreased affinity of Msh2 for ADP, and binding to mispaired DNA stabilized the binding of ATP to Msh6. Our results support a model in which mispair binding encourages a dual-occupancy state with ATP bound to Msh6 and Msh2; this state supports hydrolysis-independent sliding along DNA.
Original language | English (US) |
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Pages (from-to) | 39-49 |
Number of pages | 11 |
Journal | Molecular cell |
Volume | 22 |
Issue number | 1 |
DOIs | |
State | Published - Apr 7 2006 |
Funding
We thank Chris Putnam and Brian Orelli for insightful discussions, Manju Hingorani for providing the E. coli Msh2-Msh6 expression vector, and Kathleen Matthews for providing the LacI protein. This work was supported by NIH Grant GM50006 to R.D.K. and a postdoctoral fellowship from the American Cancer Society to D.J.M.
Keywords
- CELLBIO
- DNA
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology