Biochemical analysis of the N-terminal domain of human RAD54B.

Nucleic Acids Research
Naoyuki SaraiShigeyuki Yokoyama

Abstract

The human RAD54B protein is a paralog of the RAD54 protein, which plays important roles in homologous recombination. RAD54B contains an N-terminal region outside the SWI2/SNF2 domain that shares less conservation with the corresponding region in RAD54. The biochemical roles of this region of RAD54B are not known, although the corresponding region in RAD54 is known to physically interact with RAD51. In the present study, we have biochemically characterized an N-terminal fragment of RAD54B, consisting of amino acid residues 26-225 (RAD54B(26-225)). This fragment formed a stable dimer in solution and bound to branched DNA structures. RAD54B(26-225) also interacted with DMC1 in both the presence and absence of DNA. Ten DMC1 segments spanning the entire region of the DMC1 sequence were prepared, and two segments, containing amino acid residues 153-214 and 296-340, were found to directly bind to the N-terminal domain of RAD54B. A structural alignment of DMC1 with the Methanococcus voltae RadA protein, a homolog of DMC1 in the helical filament form, indicated that these RAD54B-binding sites are located near the ATP-binding site at the monomer-monomer interface in the DMC1 helical filament. Thus, RAD54B binding may affect the quaternar...Continue Reading

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Citations

Dec 14, 2011·Nucleic Acids Research·Yuichi MorozumiHitoshi Kurumizaka
Jun 28, 2011·Biochimica Et Biophysica Acta·Shannon J Ceballos, Wolf-Dietrich Heyer
Jul 8, 2020·Seminars in Cell & Developmental Biology·Alexander Carver, Xiaodong Zhang
Sep 10, 2018·DNA Repair·J Brooks Crickard, Eric C Greene

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Methods Mentioned

BETA
protein assay
electrophoresis
pull-down
gel filtration
crosslinking studies

Software Mentioned

PyMOL

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