Refined solution structure and backbone dynamics of HIV-1 Nef

Protein Science : a Publication of the Protein Society
S GrzesiekP T Wingfield

Abstract

The tendency of HIV-1 Nef to form aggregates in solution, particularly at pH values below 8, together with its large fraction of highly mobile residues seriously complicated determination of its three-dimensional structure, both for heteronuclear solution NMR (Grzesiek et al., 1996a, Nat Struct Biol 3:340-345) and for X-ray crystallography (Lee et al., 1996, Cell 85:931-942). Methods used to determine the Nef structure by NMR at pH 8 and 0.6 mM concentration are presented, together with a detailed description of Nef's secondary and tertiary structure. The described techniques have general applicability for the NMR structure determination of proteins that are aggregating and/or have limited stability at low pH values. Extensive chemical shift assignments are reported for backbone and side chain 1H, 13C, and 15N resonances of the HIV-1 Nef deletion mutants NEF delta 2-39, NEF delta 2-39, delta 159-173, and of NEF delta 2-39, delta 159-173 in complex with the SH3 domain of the Hck tyrosine protein kinase. Besides a type II polyproline helix, Nef's structure consists of three alpha-helices, a 3(10) helix, and a five-stranded anti-parallel beta-sheet. The analysis of 15N relaxation parameters of the backbone amide sites reveals that...Continue Reading

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