Nse5/6 is a negative regulator of the ATPase activity of the Smc5/6 complex

Abstract The multi-component Smc5/6 complex plays a critical role in the resolution of recombination intermediates formed during mitosis and meiosis, and in the cellular response to replication stress. Using recombinant proteins, we have reconstituted a series of defined Saccharomyces cerevisiae Smc...

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Published in:	Nucleic acids research Vol. 49; no. 8; pp. 4534 - 4549
Main Authors:	Hallett, Stephen T, Schellenberger, Pascale, Zhou, Lihong, Beuron, Fabienne, Morris, Ed, Murray, Johanne M, Oliver, Antony W
Format:	Journal Article
Language:	English
Published:	England Oxford University Press 07.05.2021
Subjects:	Adenosine Triphosphatases - chemistry Adenosine Triphosphatases - genetics Adenosine Triphosphatases - metabolism Cell Cycle Proteins - chemistry Cell Cycle Proteins - genetics Cell Cycle Proteins - metabolism Cell Cycle Proteins - ultrastructure Chromosomal Proteins, Non-Histone - chemistry Chromosomal Proteins, Non-Histone - genetics Chromosomal Proteins, Non-Histone - metabolism Chromosomal Proteins, Non-Histone - ultrastructure DNA - metabolism Escherichia coli - metabolism Genome Integrity, Repair and Microscopy, Electron, Transmission Saccharomyces cerevisiae - genetics Saccharomyces cerevisiae - metabolism Saccharomyces cerevisiae Proteins - chemistry Saccharomyces cerevisiae Proteins - genetics Saccharomyces cerevisiae Proteins - metabolism Saccharomyces cerevisiae Proteins - ultrastructure
ISSN:	0305-1048, 1362-4962, 1362-4962
Online Access:	Get full text
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Summary:	Abstract The multi-component Smc5/6 complex plays a critical role in the resolution of recombination intermediates formed during mitosis and meiosis, and in the cellular response to replication stress. Using recombinant proteins, we have reconstituted a series of defined Saccharomyces cerevisiae Smc5/6 complexes, visualised them by negative stain electron microscopy, and tested their ability to function as an ATPase. We find that only the six protein ‘holo-complex’ is capable of turning over ATP and that its activity is significantly increased by the addition of double-stranded DNA to reaction mixes. Furthermore, stimulation is wholly dependent on functional ATP-binding pockets in both Smc5 and Smc6. Importantly, we demonstrate that budding yeast Nse5/6 acts as a negative regulator of Smc5/6 ATPase activity, binding to the head-end of the complex to suppress turnover, irrespective of the DNA-bound status of the complex.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0305-1048 1362-4962 1362-4962
DOI:	10.1093/nar/gkab234