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M9630166.TXT
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1996-02-27
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Document 0166
DOCN M9630166
TI High-affinity interaction of human immunodeficiency virus type-1 reverse
transcriptase with partially complementary primers.
DT 9603
AU Zakharova OD; Tarrago-Litvak L; Maksakova G; Andreola ML; Dufour E;
Litvak S; Nevinsky GA; Novosibirsk Institute of Bioorganic Chemistry,
Siberian Division; of the Russian Academy of Sciences, Russia.
SO Eur J Biochem. 1995 Nov 1;233(3):856-63. Unique Identifier : AIDSLINE
MED/96085150
AB The comparison of Km and Vmax values for various primers in the reaction
of polymerization catalyzed by the human immunodeficiency virus type-1
(HIV-1) reverse transcriptase was carried out. The primers were: (a)
complementary to the template, (b) partially complementary with
mismatched nucleotides at different positions from the 3' end or (c)
non-complementary. Non-complementary primers were not elongated by HIV-1
reverse transcriptase. However, if they contained only one residue
complementary to the template or an abasic unit at the 3' end, they
could serve as primers. The most effective discrimination between
matched and mismatched primers, due to a decrease in the affinity and
Vmax, was found in the case of oligonucleotides containing
non-complementary bases at the second or third position from the 3' end
of the primer. The efficiency of discrimination by HIV-1 reverse
transcriptase between matched and mismatched base-paired primers was
about 1-1.5 orders of magnitude lower than that of procaryotic,
eucaryotic and archaebacterial DNA polymerases and avian myeloblastosis
virus reverse transcriptase. Oligonucleotides such as (dT)4(dCdG)k(dT)4
showed higher affinity for the enzyme than (dT)4 or (dT)8 primers. These
data suggest that HIV-1 reverse transcriptase, in contrast to
procaryotic, eucaryotic and archaebacterial DNA polymerases, forms
additional contacts with the 5'-end region of the non-complementary
primer. In addition, using tRNA(3Lys), the natural primer of HIV-1, it
was shown that the p66 subunit of reverse transcriptase can be
crosslinked, in the presence of a platinum derivative, to the 5' end of
tRNA. Thus, besides the normal binding site for the 3' end of tRNA,
which is crucial for the initiation of cDNA synthesis, the 5' end of the
tRNA also interacts with a specific site on the enzyme.
DE DNA, Complementary Human HIV-1/*ENZYMOLOGY Kinetics
Oligonucleotides/GENETICS/*METABOLISM RNA-Directed DNA
Polymerase/GENETICS/*METABOLISM Support, Non-U.S. Gov't JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).