FEN Nucleases: Bind, Bend, Fray, Cut
نویسندگان
چکیده
In this issue, Orans et al. (2011) and Tsutakawa et al. (2011) report exciting insights into the molecular principles governing diverse endo- and exonucleolytic cleavage specificities of members of the RAD2/FEN superfamily of nucleases, which have critical roles in DNA replication and maintenance.
منابع مشابه
Domain swapping between FEN-1 and XPG defines regions in XPG that mediate nucleotide excision repair activity and substrate specificity
FEN-1 and XPG are members of the FEN-1 family of structure-specific nucleases, which share a conserved active site. FEN-1 plays a central role in DNA replication, whereas XPG is involved in nucleotide excision repair (NER). Both FEN-1 and XPG are active on flap structures, but only XPG cleaves bubble substrates. The spacer region of XPG is dispensable for nuclease activity on flap substrates bu...
متن کاملProcessing of branched DNA intermediates by a complex of human FEN-1 and PCNA.
In eukaryotic cells, a 5' flap DNA endonuclease activity and a ds DNA 5'-exonuclease activity exist within a single enzyme called FEN-1 [flap endo-nuclease and 5(five)'-exo-nuclease]. This 42 kDa endo-/exonuclease, FEN-1, is highly homologous to human XP-G, Saccharomyces cerevisiae RAD2 and S.cerevisiae RTH1. These structure-specific nucleases recognize and cleave a branched DNA structure calle...
متن کاملecific endonucleases: implications or nucleotide excision repair
Structure-specific nucleases catalyze critical reactions in DNA replication, recombination, and repair. Recently, a structure-specific endonuclease, FEN-l, has been purified and shown to cleave DNA flap structures. Here, we describe the cloning of the murine FEN-1 gene. The nucleotide sequence of FEN-I is highly homologous to the 8accharomyces cerevisiae genes YKL510 and RAD2. We show that YKLS...
متن کاملFen-1 facilitates homologous recombination by removing divergent sequences at DNA break ends.
Homologous recombination (HR) requires nuclease activities at multiple steps, but the contribution of individual nucleases to the processing of double-strand DNA ends at different stages of HR has not been clearly defined. We used chicken DT40 cells to investigate the role of flap endonuclease 1 (Fen-1) in HR. FEN-1-deficient cells exhibited a significant decrease in the efficiency of immunoglo...
متن کاملAnatomy of a Flexer–DNA Complex inside a Higher-Order Transposition Intermediate
SUMMARY Escherichia coli HU, a nonsequence-specific histone- and HMG-like DNA-binding protein, was chemically converted into a series of HU-nucleases with an iron-EDTA-based cleavage moiety positioned at 16 rationally selected sites. Specific DNA cleavage patterns from each of these HU-nucleases allowed us to determine the precise localization, stoichiometry, and orientation of HU binding in th...
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عنوان ژورنال:
- Cell
دوره 145 شماره
صفحات -
تاریخ انتشار 2011