6JIR

Crystal structure of C. crescentus beta sliding clamp with PEG bound to putative beta-motif tethering region

6JIR の概要

• エントリーDOI: 10.2210/pdb6jir/pdb
• 分子名称: Beta sliding clamp, GLYCEROL, 1,2-ETHANEDIOL, ... (7 entities in total)
• 機能のキーワード: caulobacter crescentus, peptide bound, homodimer, transferase
• 由来する生物種: Caulobacter vibrioides CB15 (Caulobacter crescentus)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 86059.79

構造登録者

Jiang, X.,Teng, M.,Li, X. (登録日: 2019-02-23, 公開日: 2019-11-27, 最終更新日: 2023-11-22)

主引用文献

Jiang, X.,Zhang, L.,An, J.,Wang, M.,Teng, M.,Guo, Q.,Li, X.
Caulobacter crescentus beta sliding clamp employs a noncanonical regulatory model of DNA replication.
Febs J., 287:2292-2311, 2020

PubMed Abstract: The eubacterial β sliding clamp (DnaN) plays a crucial role in DNA metabolism through direct interactions with DNA, polymerases, and a variety of protein factors. A canonical protein-DnaN interaction has been identified in Escherichia coli and some other species, during which protein partners are tethered into the conserved canonical hydrophobic crevice of DnaN via the consensus β-binding motif. Caulobacter crescentus is an excellent research model for use in the investigation of DNA replication and cell-cycle regulation due to its unique asymmetric cell division pattern with restricted replication initiation; however, little is known about the specific features of C. crescentus DnaN (CcDnaN). Here, we report a significant divergence in the association of CcDnaN with proteins based on docking analysis and crystal structures that show that the β-binding motifs of its protein partners bind a novel pocket instead of the canonical site. Pull-down and isothermal titration calorimetry results revealed that mutations within the novel pocket disrupt protein-CcDnaN interactions. It was also shown by replication and regulatory inactivation of DnaA assays that mediation of protein interaction by the novel pocket is closely related to the performance of CcDnaN during replication and the DnaN-mediated regulation process. Moreover, assessments of clamp competition showed that DNA does not compete with protein partners when binding to the novel pocket. Overall, our structural and biochemical analyses provide strong evidence that CcDnaN employs a noncanonical protein association pattern.

PubMed: 31725950
DOI: 10.1111/febs.15138

実験手法

X-RAY DIFFRACTION (1.95 Å)