Sci Rep-Vondrova20 A role of the Nse4 kleisin and Nse1-Nse3 KITE subunits in the ATPase cycle of SMC5-6.pdf (5.92 MB)
A role of the Nse4 kleisin and Nse1/Nse3 KITE subunits in the ATPase cycle of SMC5/6
journal contribution
posted on 2023-06-07, 07:47 authored by Lucie Vondrova, Peter Kolesar, Marek Adamus, Matej Nociar, Antony OliverAntony Oliver, Jan J PalecekThe SMC (Structural Maintenance of Chromosomes) complexes are composed of SMC dimers, kleisin and kleisin-interacting (HAWK or KITE) subunits. Mutual interactions of these subunits constitute the basal architecture of the SMC complexes. In addition, binding of ATP molecules to the SMC subunits and their hydrolysis drive dynamics of these complexes. Here, we developed new systems to follow the interactions between SMC5/6 subunits and the relative stability of the complex. First, we show that the N-terminal domain of the Nse4 kleisin molecule binds to the SMC6 neck and bridges it to the SMC5 head. Second, binding of the Nse1 and Nse3 KITE proteins to the Nse4 linker increased stability of the ATP-free SMC5/6 complex. In contrast, binding of ATP to SMC5/6 containing KITE subunits significantly decreased its stability. Elongation of the Nse4 linker partially suppressed instability of the ATP-bound complex, suggesting that the binding of the KITE proteins to the Nse4 linker constrains its limited size. Our data suggest that the KITE proteins may shape the Nse4 linker to fit the ATP-free complex optimally and to facilitate opening of the complex upon ATP binding. This mechanism suggests an important role of the KITE subunits in the dynamics of the SMC5/6 complexes.
Funding
How do Smc5/6 interactions with DNA coordinate replication and recombination?; G2119; MRC-MEDICAL RESEARCH COUNCIL; MR/P018955/1
History
Publication status
- Published
File Version
- Published version
Journal
Scientific ReportsISSN
2045-2322Publisher
Nature Publishing GroupExternal DOI
Issue
1Volume
10Article number
a9694Event location
EnglandDepartment affiliated with
- Sussex Centre for Genome Damage Stability Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-08-24First Open Access (FOA) Date
2020-08-24First Compliant Deposit (FCD) Date
2020-08-21Usage metrics
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