Bernardi A, Gaillard C, Bernardi G. The specificity of five DNAases as studied by the analysis of 5'-terminal doublets.
EUROPEAN JOURNAL OF BIOCHEMISTRY 1975;
52:451-7. [PMID:
800985 DOI:
10.1111/j.1432-1033.1975.tb04013.x]
[Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The 5'-terminal dinucleotides released by five deoxyribonucleases (spleen acid DNase, snail acid DNase, pancreatic DNase, Escherichia coli endonuclease I and crab DNase) have been determined on E. coli DNA (51% dG & dC) digests having different average sizes (Pn) in the range 50 to 10. It has been shown that the composition of the 5'-terminal dinucleotide (a) is independent upon the degradation level, at least in the range explored; (b) is strongly different from the composition of E. coli DNA doublets, these differences being characteristic for each enzyme; (c) is very significantly different from the statistical composition of 5'-terminal dinucleotides, as calculated from the composition of 5'-terminal and penultimate nucleotides. A calculation of the statistical composition of the trinucleotides split by each enzyme, using the 3'-terminal nucleotide data in conjunction with the 5'-terminal dinucleotide results provided a qualitative "specificity spectrum" for each enzyme.
Collapse