6QJ3

Crystal structure of the C. thermophilum condensin Ycs4-Brn1 subcomplex

Summary for 6QJ3

• Entry DOI: 10.2210/pdb6qj3/pdb
• Descriptor: Condensin complex subunit 1,Condensin complex subunit 1,Ycs4, Condensin complex subunit 2, Brn1 (3 entities in total)
• Functional Keywords: condensin smc complex atpase chromosome condensation loop extrusion, cell cycle
• Biological source: Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719); More
• Total number of polymer chains: 3
• Total formula weight: 153952.56

Authors

Hassler, M.,Haering, C.H.,Kschonsak, M. (deposition date: 2019-01-22, release date: 2019-07-03, Last modification date: 2024-10-16)

Primary citation

Hassler, M.,Shaltiel, I.A.,Kschonsak, M.,Simon, B.,Merkel, F.,Tharichen, L.,Bailey, H.J.,Macosek, J.,Bravo, S.,Metz, J.,Hennig, J.,Haering, C.H.
Structural Basis of an Asymmetric Condensin ATPase Cycle.
Mol.Cell, 74:1175-1188.e9, 2019

PubMed Abstract: The condensin protein complex plays a key role in the structural organization of genomes. How the ATPase activity of its SMC subunits drives large-scale changes in chromosome topology has remained unknown. Here we reconstruct, at near-atomic resolution, the sequence of events that take place during the condensin ATPase cycle. We show that ATP binding induces a conformational switch in the Smc4 head domain that releases its hitherto undescribed interaction with the Ycs4 HEAT-repeat subunit and promotes its engagement with the Smc2 head into an asymmetric heterodimer. SMC head dimerization subsequently enables nucleotide binding at the second active site and disengages the Brn1 kleisin subunit from the Smc2 coiled coil to open the condensin ring. These large-scale transitions in the condensin architecture lay out a mechanistic path for its ability to extrude DNA helices into large loop structures.

PubMed: 31226277
DOI: 10.1016/j.molcel.2019.03.037

Experimental method

X-RAY DIFFRACTION (3.3 Å)