8ROC

Human cohesin SMC1A-HD(shortCC-EQ)/RAD21-C complex - Apo closed P-loop conformation

Summary for 8ROC

• Entry DOI: 10.2210/pdb8roc/pdb
• Descriptor: Structural maintenance of chromosomes protein 1A, 64-kDa C-terminal product (3 entities in total)
• Functional Keywords: 3d genome organization, chromatin, cohesin, atpase activity, atpase cycle, nuclear protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 2
• Total formula weight: 49868.77

Authors

Vitoria Gomes, M.,Romier, C. (deposition date: 2024-01-11, release date: 2024-09-11, Last modification date: 2024-09-18)

Primary citation

Vitoria Gomes, M.,Landwerlin, P.,Diebold-Durand, M.L.,Shaik, T.B.,Durand, A.,Troesch, E.,Weber, C.,Brillet, K.,Lemee, M.V.,Decroos, C.,Dulac, L.,Antony, P.,Watrin, E.,Ennifar, E.,Golzio, C.,Romier, C.
The cohesin ATPase cycle is mediated by specific conformational dynamics and interface plasticity of SMC1A and SMC3 ATPase domains.
Cell Rep, 43:114656-114656, 2024

PubMed Abstract: Cohesin is key to eukaryotic genome organization and acts throughout the cell cycle in an ATP-dependent manner. The mechanisms underlying cohesin ATPase activity are poorly understood. Here, we characterize distinct steps of the human cohesin ATPase cycle and show that the SMC1A and SMC3 ATPase domains undergo specific but concerted structural rearrangements along this cycle. Specifically, whereas the proximal coiled coil of the SMC1A ATPase domain remains conformationally stable, that of the SMC3 displays an intrinsic flexibility. The ATP-dependent formation of the heterodimeric SMC1A/SMC3 ATPase module (engaged state) favors this flexibility, which is counteracted by NIPBL and DNA binding (clamped state). Opening of the SMC3/RAD21 interface (open-engaged state) stiffens the SMC3 proximal coiled coil, thus constricting together with that of SMC1A the ATPase module DNA-binding chamber. The plasticity of the ATP-dependent interface between the SMC1A and SMC3 ATPase domains enables these structural rearrangements while keeping the ATP gate shut. VIDEO ABSTRACT.

PubMed: 39240714
DOI: 10.1016/j.celrep.2024.114656

Experimental method

X-RAY DIFFRACTION (1.85 Å)