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2014 ; 289
(25
): 17634-46
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Interaction of branch migration translocases with the Holliday junction-resolving
enzyme and their implications in Holliday junction resolution
#MMPMID24770420
Cañas C
; Suzuki Y
; Marchisone C
; Carrasco B
; Freire-Benéitez V
; Takeyasu K
; Alonso JC
; Ayora S
J Biol Chem
2014[Jun]; 289
(25
): 17634-46
PMID24770420
show ga
Double-strand break repair involves the formation of Holliday junction (HJ)
structures that need to be resolved to promote correct replication and
chromosomal segregation. The molecular mechanisms of HJ branch migration and/or
resolution are poorly characterized in Firmicutes. Genetic evidence suggested
that the absence of the RuvAB branch migration translocase and the RecU HJ
resolvase is synthetically lethal in Bacillus subtilis, whereas a recU recG
mutant was viable. In vitro RecU, which is restricted to bacteria of the
Firmicutes phylum, binds HJs with high affinity. In this work we found that RecU
does not bind simultaneously with RecG to a HJ. RuvB by interacting with RecU
bound to the central region of HJ DNA, loses its nonspecific association with
DNA, and re-localizes with RecU to form a ternary complex. RecU cannot stimulate
the ATPase or branch migration activity of RuvB. The presence of RuvB·ATP?S
greatly stimulates RecU-mediated HJ resolution, but the addition of ATP or RuvA
abolishes this stimulatory effect. A RecU·HJ·RuvAB complex might be formed. RecU
does not increase the RuvAB activities but slightly inhibits them.