Purification and characterization of a mammalian endo-exonuclease.

Abstract:

:An endo-exonuclease has been purified from cultured monkey (CV-1) cells. The enzyme which was purified to near homogeneity to be a 65 kDa monomeric protein. The single-strand DNase activity is endonucleolytic and nonprocessive, whereas the double-strand DNase activity is exonucleolytic and processive. The enzyme was also found to have RNase activity using poly-rA as substrate. The pH optimum for ss-DNase is 8 and for ds-DNase it is 7.5. Both DNase activities require a divalent metal ion (Mg2+, Mn2+, Ca2+, Zn2+) for activity and exhibit the same kinetics of heat inactivation. The purified protein binds to and cleaves a synthetic Holliday junction substrate. The overall enzymatic characteristics of the mammalian protein are very similar to the putative recombination endo-exonucleases purified from Neurospora crassa, Aspergillus nidulans and Saccharomyces cerevisiae.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Couture C,Chow TY

doi

10.1093/nar/20.16.4355

keywords:

subject

Has Abstract

pub_date

1992-08-25 00:00:00

pages

4355-61

issue

16

eissn

0305-1048

issn

1362-4962

journal_volume

20

pub_type

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