Activity of DNA and RNA polymerases in resurfacing rabbit corneal epithelium
作者:
ColleyA. M.,
LawM. L.,
DrakeL. A.,
CavanaghH. D.,
期刊:
Current Eye Research
(Taylor Available online 1987)
卷期:
Volume 6,
issue 3
页码: 477-487
ISSN:0271-3683
年代: 1987
DOI:10.3109/02713688709025204
出版商: Taylor&Francis
数据来源: Taylor
摘要:
Activity of RNA polymerases I, II and III (distinguished usingα-amanitin) and activity of DNA polymerasesαandβ(distinguished using N-ethylmaleimide) were assayed for varying intervals and at varying substrate (UTP or dTTP) concentrations in the purified nuclear fraction from corneal epithelium of carbamylcholine-treated and control eyes of rabbits with resurfacing acid burn defects. Incorporation was linear with time for all enzymes up to 30 min. In 10 min assays at varying substrate concentrations, all polymerases from carbamylcholine-treated eyes had significantly elevated Vmax compared to corresponding control enzymes. The drug also increased apparent affinity of RNA polymerase II for UTP and apparent affinity of DNA polymerases a and 3 for dTTP. Results are discussed in relation to potential mechanisms by which effects of carbamylcholine on polymerase activity may be mediated.
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