home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload Trio 2
/
Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
/
dir26
/
med9409d.zip
/
M9490627.TXT
< prev
next >
Wrap
Text File
|
1994-09-24
|
2KB
|
40 lines
Document 0627
DOCN M9490627
TI An active recombinant p15 RNase H domain is functionally distinct from
the RNase H domain associated with human immunodeficiency virus type 1
reverse transcriptase.
DT 9411
AU Evans DB; Fan N; Swaney SM; Tarpley WG; Sharma SK; Biochemistry
Research, Upjohn Laboratories, Kalamazoo, Michigan; 49001.
SO J Biol Chem. 1994 Aug 26;269(34):21741-7. Unique Identifier : AIDSLINE
MED/94342369
AB An active p15 RNase H domain, consisting of amino acids 427-560 of human
immunodeficiency virus type 1 (HIV-1) reverse transcriptase (RT) and a
genetically engineered penta-histidine N-terminal affinity tag, was
expressed in Escherichia coli and purified to apparent homogeneity by
immobilized metal affinity chromatography. The purified p15 RNase H
domain exhibited no substrate preference for [3H]poly(rG).poly(dC)
compared to [3H]poly(rA).poly(dT), in contrast with the HIV-1
RT-associated RNase H, which showed a 30-fold preference for the former
substrate. Unlike the HIV-1 RT-associated RNase H, when challenged with
unlabeled substrate, the recombinant p15 RNase H domain was relatively
nonprocessive in RNA degradative activity of the [3H]poly(rA).poly(dT)
duplex. Kinetic studies using p15 RNase H showed substrate inhibition
with an apparent K(i) value of 0.12 micron for the [3H]poly(rA).poly(dT)
hybrid. Substrate inhibition was not observed for the HIV-1
RT-associated RNase H. The results show that the isolated p15 HIV-1
RNase H domain is functionally distinct from the recombinant HIV-1
RT-associated RNase H.
DE Amino Acid Sequence Base Sequence Cations, Divalent/PHARMACOLOGY
Comparative Study Escherichia coli/GENETICS HIV-1/*ENZYMOLOGY
Molecular Sequence Data Peptide Fragments/GENETICS/*METABOLISM Protein
Engineering Recombinant Proteins/METABOLISM Reverse
Transcriptase/ANTAGONISTS & INHIB/DRUG EFFECTS/GENETICS/ *METABOLISM
Ribonuclease H, Calf Thymus/DRUG EFFECTS/GENETICS/*METABOLISM
RNA/METABOLISM Substrate Specificity Support, U.S. Gov't, P.H.S.
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).