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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Biochem+Biophys+Res+Commun
2011 ; 411
(4
): 684-9
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DNA secondary structure of the released strand stimulates WRN helicase action on
forked duplexes without coordinate action of WRN exonuclease
#MMPMID21763283
Ahn B
; Bohr VA
Biochem Biophys Res Commun
2011[Aug]; 411
(4
): 684-9
PMID21763283
show ga
Werner syndrome (WS) is an autosomal recessive premature aging disorder
characterized by aging-related phenotypes and genomic instability. WS is caused
by mutations in a gene encoding a nuclear protein, Werner syndrome protein (WRN),
a member of the RecQ helicase family, that interestingly possesses both helicase
and exonuclease activities. Previous studies have shown that the two activities
act in concert on a single substrate. We investigated the effect of a DNA
secondary structure on the two WRN activities and found that a DNA secondary
structure of the displaced strand during unwinding stimulates WRN helicase
without coordinate action of WRN exonuclease. These results imply that WRN
helicase and exonuclease activities can act independently, and we propose that
the uncoordinated action may be relevant to the in vivo activity of WRN.