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Intramolecular chimeras of the p51 subunit between HIV-1 and FIV reverse transcriptases suggest a stabilizing function for the p66 subunit in the heterodimeric enzyme.


Tasara, T; Amacker, M; Hübscher, U (1999). Intramolecular chimeras of the p51 subunit between HIV-1 and FIV reverse transcriptases suggest a stabilizing function for the p66 subunit in the heterodimeric enzyme. Biochemistry, 35(5):1633-1642.

Abstract

The human immunodeficiency virus (HIV) reverse transcriptase (RT) is a heterodimeric enzyme composed of a 66 kDa (p66) and a 51 kDa (p51) subunit. Recently we showed that p51 plays an important role in the conformation of p66 within the HIV-1 RT heterodimer and hence appears to influence its catalytic activities [Amacker, M., and H ubscher, U. (1998) J. Mol. Biol. 278, 757-765]. This was further investigated here via construction of three intramolecular chimeras of HIV-1 and FIV RTs. The first 25 and 112 amino acids of the N terminus, respectively, as well as the last 22 amino acids of the C terminus in the p51 subunit of HIV-1 RT were exchanged with the corresponding regions of the FIV RT and combined with the wild-type HIV-1 p66. Characterization of these chimeric RT heterodimers demonstrated significant biochemical differences in (i) DNA-dependent DNA synthesis, (ii) strand displacement DNA synthesis, and (iii) RNase H activity. Our results indicate that both the N and C termini of HIV-1 RT p51 appear to be important in stabilizing the RT heterodimer for enzymatic functions.

The human immunodeficiency virus (HIV) reverse transcriptase (RT) is a heterodimeric enzyme composed of a 66 kDa (p66) and a 51 kDa (p51) subunit. Recently we showed that p51 plays an important role in the conformation of p66 within the HIV-1 RT heterodimer and hence appears to influence its catalytic activities [Amacker, M., and H ubscher, U. (1998) J. Mol. Biol. 278, 757-765]. This was further investigated here via construction of three intramolecular chimeras of HIV-1 and FIV RTs. The first 25 and 112 amino acids of the N terminus, respectively, as well as the last 22 amino acids of the C terminus in the p51 subunit of HIV-1 RT were exchanged with the corresponding regions of the FIV RT and combined with the wild-type HIV-1 p66. Characterization of these chimeric RT heterodimers demonstrated significant biochemical differences in (i) DNA-dependent DNA synthesis, (ii) strand displacement DNA synthesis, and (iii) RNase H activity. Our results indicate that both the N and C termini of HIV-1 RT p51 appear to be important in stabilizing the RT heterodimer for enzymatic functions.

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Additional indexing

Item Type:Journal Article, refereed
Communities & Collections:05 Vetsuisse Faculty > Institute of Veterinary Biochemistry and Molecular Biology
Dewey Decimal Classification:570 Life sciences; biology
Language:English
Date:2 February 1999
Deposited On:11 Feb 2008 12:18
Last Modified:05 Apr 2016 12:16
Publisher:American Chemical Society
ISSN:0006-2960
Publisher DOI:10.1021/bi9821162
PubMed ID:9931031

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