After being activated by a mismatch, MSH2:MSH6 (MutSalpha) r...
| created | [InstanceEdit:5358864] May, Bruce, 2014-04-05 |
| dbId | 5358880 |
| displayName | After being activated by a mismatch, MSH2:MSH6 (MutSalpha) r... |
| modified | [InstanceEdit:5575578] May, Bruce, 2014-05-24 |
| schemaClass | Summation |
| text | After being activated by a mismatch, MSH2:MSH6 (MutSalpha) recruits MLH1:PMS2 (MutLalpha) to form a ternary complex with mismatched DNA (Gu et al. 1998, Blackwell et al. 2001, Plotz et al. 2002). As inferred from yeast, multiple MLH1:PMS2 complexes may be loaded at each mismatch (Hombauer et al. 2011). MSH2:MSH6 and MLH1:PMS2 interact with PCNA (Gu et al. 1998, Clark et al. 2000, Kleczkowska et al. 2001, Zhang et al. 2005, Constantin et al. 2005, Iyer et al. 2008, Masih et al. 2008, Iyer et al. 2010). The binding sites for MLH1:PMS2 and PCNA are distinct on MSH2:MSH6 so it is possible that both can bind simultaneously (Iyer et al. 2010). The interaction with PCNA appears to direct the orientation of the repair complex so as to determine which strand will be used as template and which strand will be repaired. In vivo, the recently replicated strand is repaired. In vitro, the strand containing a nick is repaired (Zhang et al. 2005, Constantin et al. 2005), possibly due to the ability of the nick to orient the loading of PCNA onto DNA by RFC (Pluciennik et al. 2010). |
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