Linked Life Data

8485214

Source:http://linkedlifedata.com/resource/pubmed/id/8485214

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-6-10
pubmed:abstractText
gamma-p-Azidoanilidate of dTTP was used to study the photoaffinity modification of DNA polymerase I and Klenow fragment. The analog was found to be a mixed-type inhibitor with respect to dTTP of the polymerization reaction catalyzed by DNA polymerase I and Klenow fragment. In the absence of the reagent both UV-irradiated enzymes were rapidly inactivated. Substrates (dNTP and template-primer) protected the enzymes from inactivation by UV-light with different efficiency. In the presence of the template-primer UV-irradiation induced activation of DNA polymerase I. The effect of the analog on both enzyme forms under irradiation is different. At concentration of 10(-5)M gamma-p-anilidate of dTTP accelerated the activation of DNA polymerase I initiated by UV-irradiation and at 10(-4)M concentration it inactivated the enzyme by 20-25%. Under such conditions one enzyme molecule covalently bound two molecules of the analog. While the template-complementary substrate (dTTP) protected DNA polymerase I both from inactivation and modification, the non-complementary one (dCTP) worked only against modification. In contrast to DNA polymerase I Klenow fragment was not inactivated when exposed to UV-irradiation and gamma-p-anilidate of dTTP neither modified the protein nor exerted any significant effect on its polymerization activity. The data accumulated suggest the presence on the DNA polymerase I molecule of a regulatory region providing additional dNTP binding sites.
pubmed:language
rus
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0320-9725
pubmed:author
pubmed:issnType
Print
pubmed:volume
58
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
224-33
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
[Features of interaction of Escherichia coli DNA polymerase I and its Klenow fragment with dTTP gamma-p-azidoanilide].
pubmed:publicationType
Journal Article, English Abstract