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1994-07-02
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Document 0171
DOCN M9470171
TI Engineering of the human-immunodeficiency-virus-type-1 (HIV-1) reverse
transcriptase gene to prevent dimerization of the expressed chimaeric
protein: purification and characterization of a monomeric HIV-1 reverse
transcriptase.
DT 9409
AU Sharma SK; Basu A; Fan N; Evans DB; Upjohn Laboratories, Kalamazoo, MI
49001.
SO Biotechnol Appl Biochem. 1994 Apr;19 ( Pt 2):155-67. Unique Identifier :
AIDSLINE MED/94250350
AB We report here a human-immunodeficiency-virus-type-1 (HIV-1) recombinant
reverse transcriptase (RT) engineered to contain a 26-amino-acid linker
insertion from the tether domain of feline leukaemia virus (FLV) RT. The
chimaeric protein was expressed in Escherichia coli and migrated on
SDS/PAGE as a 68 kDa band. A monomeric form of the chimaeric HIV-1 RT
has been prepared by the coordinated applications of
immobilized-metal-affinity chromatography and gel filtration on Superose
12 columns. The monomeric nature of this chimaeric HIV-I RT was further
characterized by cross-linking studies using disuccinimidyl suberate.
The RNA-dependent DNA polymerase activity of the monomeric chimaeric
HIV-1 RT was 35% that of the heterodimeric (p66/p51) HIV-1 RT. These
results support our recent studies on the monomeric polymerase domain
(p51 RT) which exhibited an RNA-dependent DNA polymerase activity equal
to 33% of that of the p66/p51 heterodimeric HIV-1 RT (Evans, Kezdy,
Tarpley and Sharma [1993] Biotechnol. Appl. Biochem. 17, 91-102). The
inability of the monomeric chimaeric HIV-1 RT to display polymerase
activity like that of the heterodimeric HIV-1 RT is attributed to a
decrease in the processive rate of DNA synthesis (75%) and DNA binding
(65%). However, the monomeric chimaeric HIV-1 RT (p68) exhibited RNAase
H activity like that of the heterodimeric form (p66/p51) of HIV-1 RT.
These results suggest that the linker insertion from FLV RT does not
interfere with the RNAase H activity associated with the monomeric HIV-1
RT.
DE Amino Acid Sequence Chimeric Proteins/CHEMISTRY/GENETICS/ISOLATION &
PURIF Chromatography, Affinity Chromatography, Gel Cross-Linking
Reagents DNA Polymerases/METABOLISM Electrophoresis, Polyacrylamide
Gel Escherichia coli/GENETICS Human HIV-1/GENETICS Leukemia Virus,
Feline/CHEMISTRY/ENZYMOLOGY Molecular Sequence Data Molecular Weight
Polymers Protein Engineering Reverse
Transcriptase/CHEMISTRY/*GENETICS/ISOLATION & PURIF Ribonuclease H,
Calf Thymus/METABOLISM Succinimides/CHEMISTRY 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).