Linked Life Data

9845950

Source:http://linkedlifedata.com/resource/pubmed/id/9845950

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
11
pubmed:dateCreated
1999-1-14
pubmed:abstractText
The effect of chromomycin A3 binding on the geometry of DNA duplex (plasmid pBR322) has been examined using topoisomerase I relaxation followed by gel electrophoresis. To determine the equilibrium constant of this drug-DNA binding-dissociation reaction in the same concentration range (ca. 10(-5) M) in the same buffer as those for the topoisomerase reaction (at 37 degrees C), fluorescence measurements were made of the same plasmid-drug system, followed by a Scatchard plot and an analysis using McGhee-von Hippel's exclusion site model. The binding constant has been found to be 3.8 x 10(5) M-1 in the particular buffer (buffer-T) at 37 degrees C, and the number of base pairs involved in the site of one chromomycin molecule on the duplex has been found to be 5. It has been concluded that one chromomycin molecule, bound to the duplex, unwinds it by 11.8 +/- 1.1 degrees. In addition, the enthalpy of binding was determined to be 31.81 kJ/mole using a titration calorimeter with a more concentrated (6.2 mM) solution.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0009-2363
pubmed:author
pubmed:issnType
Print
pubmed:volume
46
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1667-71
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
The average unwinding angle of DNA duplex produced by the binding of chromomycin A3.
pubmed:affiliation
Department of Fundamental Science, Iwaki-Meisei University, Fukushima, Japan.
pubmed:publicationType
Journal Article