6E8D

Crystal structure of the Bacillus subtilis sliding clamp-MutL complex.

6E8D の概要

• エントリーDOI: 10.2210/pdb6e8d/pdb
• 分子名称: Beta sliding clamp,DNA mismatch repair protein MutL, GLYCEROL (3 entities in total)
• 機能のキーワード: complex, dna binding protein
• 由来する生物種: Bacillus subtilis; 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 229715.69

構造登録者

Guarne, A.,Almawi, A.W. (登録日: 2018-07-28, 公開日: 2019-05-01, 最終更新日: 2024-03-13)

主引用文献

Almawi, A.W.,Scotland, M.K.,Randall, J.R.,Liu, L.,Martin, H.K.,Sacre, L.,Shen, Y.,Pillon, M.C.,Simmons, L.A.,Sutton, M.D.,Guarne, A.
Binding of the regulatory domain of MutL to the sliding beta-clamp is species specific.
Nucleic Acids Res., 47:4831-4842, 2019

PubMed Abstract: The β-clamp is a protein hub central to DNA replication and fork management. Proteins interacting with the β-clamp harbor a conserved clamp-binding motif that is often found in extended regions. Therefore, clamp interactions have -almost exclusively- been studied using short peptides recapitulating the binding motif. This approach has revealed the molecular determinants that mediate the binding but cannot describe how proteins with clamp-binding motifs embedded in structured domains are recognized. The mismatch repair protein MutL has an internal clamp-binding motif, but its interaction with the β-clamp has different roles depending on the organism. In Bacillus subtilis, the interaction stimulates the endonuclease activity of MutL and it is critical for DNA mismatch repair. Conversely, disrupting the interaction between Escherichia coli MutL and the β-clamp only causes a mild mutator phenotype. Here, we determined the structures of the regulatory domains of E. coli and B. subtilis MutL bound to their respective β-clamps. The structures reveal different binding modes consistent with the binding to the β-clamp being a two-step process. Functional characterization indicates that, within the regulatory domain, only the clamp binding motif is required for the interaction between the two proteins. However, additional motifs beyond the regulatory domain may stabilize the interaction. We propose a model for the activation of the endonuclease activity of MutL in organisms lacking methyl-directed mismatch repair.

PubMed: 30916336
DOI: 10.1093/nar/gkz115

実験手法

X-RAY DIFFRACTION (2.34 Å)