Gln(84) of moloney murine leukemia virus reverse transcriptase regulates the incorporation rates of ribonucleotides and deoxyribonucleotides.

Abstract:

:Moloney murine leukemia virus reverse transcriptase (RT) selectively uses deoxyribonucleotides over ribonucleotides (rNTPs) as substrates. Substitution of F155 with valine (F155V) was previously found to increase the enzyme's affinity for rNTPs, though without affecting the V(max) for catalysis, and thereby conferred to the enzyme significant RNA polymerase activity. We have sought new mutations that might increase the RNA polymerase activity of the F155V mutant. We report here that substitution of Q84 with alanine improved RT-F155V's RNA polymerase activity, but also its DNA polymerase activity. Kinetic analysis and gel-retardation assays suggested that the substitution increased the enzyme's general affinity for the template-primer.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Liu S,Goff SP,Gao G

doi

10.1016/j.febslet.2006.01.044

keywords:

subject

Has Abstract

pub_date

2006-02-20 00:00:00

pages

1497-501

issue

5

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(06)00097-4

journal_volume

580

pub_type

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