Activity of DNA and RNA polymerases in resurfacing rabbit corneal epithelium.

Abstract:

:Activity of RNA polymerases I, II and III (distinguished using alpha-amanitin) and activity of DNA polymerases alpha and beta (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 alpha and beta for dTTP. Results are discussed in relation to potential mechanisms by which effects of carbamylcholine on polymerase activity may be mediated.

journal_name

Curr Eye Res

journal_title

Current eye research

authors

Colley AM,Law ML,Drake LA,Cavanagh HD

doi

10.3109/02713688709025204

subject

Has Abstract

pub_date

1987-03-01 00:00:00

pages

477-87

issue

3

eissn

0271-3683

issn

1460-2202

journal_volume

6

pub_type

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