SSB and the RecG DNA helicase: an intimate association to rescue a stalled replication fork |
| |
| Authors: | Piero R. Bianco Yuri L. Lyubchenko |
| |
| Affiliation: | 1. SUNY Microbiology and Immunology, Center for Single Molecule Biophysics, University at Buffalo, Buffalo, New York 14214;2. Department of Microbiology and Immunology, University at Buffalo, Buffalo, New York;3. Department of Biochemistry, University at Buffalo, Buffalo, New York;4. Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, Nebraska |
| |
| Abstract: | In E. coli, the regression of stalled DNA replication forks is catalyzed by the DNA helicase RecG. One means of gaining access to the fork is by binding to the single strand binding protein or SSB. This interaction occurs via the wedge domain of RecG and the intrinsically disordered linker (IDL) of SSB, in a manner similar to that of SH3 domains binding to PXXP motif‐containing ligands in eukaryotic cells. During loading, SSB remodels the wedge domain so that the helicase domains bind to the parental, duplex DNA, permitting the helicase to translocate using thermal energy. This translocation may be used to clear the fork of obstacles, prior to the initiation of fork regression. |
| |
| Keywords: | RecG SSB stalled replication fork DNA repair DNA replication helicase atomic force microscopy OB‐fold SH3 domain PXXP motif |
|
|
