MutL and MutS are key components of the DNA repair machinery that corrects replication errors [1]. MutS recognises mispaired or unpaired bases in a DNA duplex and in the presence of ATP, recruits MutL to form a DNA signaling complex for repair. The N terminal region of MutL contains the ATPase domain and the C terminal is involved in dimerisation [3].

1: Mismatch repair in replication fidelity, genetic recombination, and cancer biology. Modrich P, Lahue R; Annu Rev Biochem. 1996;65:101-133. PMID:8811176

2: Analysis of the quaternary structure of the MutL C-terminal domain. Kosinski J, Steindorf I, Bujnicki JM, Giron-Monzon L, Friedhoff P; J Mol Biol. 2005;351:895-909. PMID:16024043

3: Structure of the MutL C-terminal domain: a model of intact MutL and its roles in mismatch repair. Guarne A, Ramon-Maiques S, Wolff EM, Ghirlando R, Hu X, Miller JH, Yang W; EMBO J. 2004;23:4134-4145. PMID:15470502