Temperature-dependent equilibrium between the open and closed conformation of the p66 subunit of HIV-1 reverse transcriptase revealed by site-directed spin labelling

Oliver Kensch, Tobias Restle, Birgitta M. Wöhrl, Roger S. Goody, Heinz Jürgen Steinhoff*

*Korrespondierende/r Autor/-in für diese Arbeit
51 Zitate (Scopus)

Abstract

X-ray crystallographic studies of human immunodeficiency virus type 1 reverse transcriptase complexed with or without substrates or inhibitors show that the heterodimeric enzyme adopts distinct conformations that differ in the orientation of the so-called thumb subdomain in the large subunit. Site-directed spin labelling of mutated residue positions W24C and K287C is applied here to determine the distances between the fingers and thumb subdomains of liganded and unliganded RT in solution. The inter-spin distances of a DNA/DNA and a pseudoknot RNA complexed reverse transcriptase in solution was found to agree with the respective crystal data of the open and closed conformations. For the unliganded reverse transcriptase a temperature-dependent equilibrium between these two states was observed. The fraction of the closed conformation decreased from 95% at 313 K to 65% at 273 K. The spectral separation between the two structures was facilitated by the use of a perdeuterated [15N]nitroxide methane-thiosulfonate spin label. (C) 2000 Academic Press.

OriginalspracheEnglisch
ZeitschriftJournal of Molecular Biology
Jahrgang301
Ausgabenummer4
Seiten (von - bis)1029-1039
Seitenumfang11
ISSN0022-2836
DOIs
PublikationsstatusVeröffentlicht - 25.08.2000

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