The interaction of ribonuclease T 1 with DNA.

Abstract:

:The interaction of RNase T1 with calf thymus DNA was studied using uv difference spectroscopy and the effect of the enzyme on DNA melting. There was no indication of RNase T1 binding with native DNA. A prominent difference spectrum for RNase T1 binding with denatured DNA (d-DNA) was observed at pH 5, 25 degrees and low ionic strength (mu = .01 M) which was depressed at higher ionic strength and pH. The normalized difference spectrum at mu = .01 M, pH 5 and 25 degrees can be interpreted as indicating an interaction of an exposed guanine residue directly with the enzyme and a coupling of this process with the "melting" of short folded segments of d-DNA. The apparent association constant calculated per M guanine residues was 2.4 X 10-4 M-1 under these conditions. The results are discussed in reference to comparable studies on the interaction of RNase T1 with RNA and small guanine ligands.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Walz FG,Biddlecome S,Hooverman L

doi

10.1093/nar/2.1.11

subject

Has Abstract

pub_date

1975-01-01 00:00:00

pages

11-20

issue

1

eissn

0305-1048

issn

1362-4962

journal_volume

2

pub_type

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