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Default Alternating zinc fingers in the human male associated protein ZFY: refinement of the

Alternating zinc fingers in the human male associated protein ZFY: refinement of the NMR structure of an even finger by selective deuterium labeling and implications for DNA recognition.

Alternating zinc fingers in the human male associated protein ZFY: refinement of the NMR structure of an even finger by selective deuterium labeling and implications for DNA recognition.

Biochemistry. 1991 Jul 23;30(29):7063-72

Authors: Kochoyan M, Keutmann HT, Weiss MA

ZFY, a male-associated Zn-finger protein encoded by the human Y chromosome, exhibits a distinctive two-finger repeat: whereas odd-numbered domains fit a general consensus, even-numbered domains exhibit systematic differences. Do these odd and even sequences encode structurally distinct surfaces for DNA recognition? As a first step toward answering this question, we have recently described the sequential 1H NMR assignment of a representative nonconsensus Zn finger (designated ZFY-6T) based on 2D NMR studies of a 30-residue peptide [Kochoyan, M., Havel, T.F., Nguyen, D.T., Dahl, C.E., Keutmann, H. T., & Weiss, M.A. (1991) Biochemistry 30, 3371-3386]. Initial structural modeling by distance geometry/simulated annealing (DG/SA) demonstrated that this peptide retained the N-terminal beta-hairpin and C-terminal alpha-helix (beta beta alpha motif) observed in consensus Zn fingers. However, the precision of this initial structure was limited by resonance overlap, which led to ambiguities in the assignment of key NOEs in the hydrophobic core. In this paper these ambiguities are resolved by selective deuterium labeling, enabling a refined structure to be calculated by DG/SA and restrained molecular dynamics. These calculations provide a detailed view of the hydrophobic core and protein surface, which are analyzed in reference to previously characterized Zn fingers. Variant (even) and consensus (odd) aromatic residues Y10 and F12, shown in an "aromatic swap" analogue to provide equivalent contributions to the hydrophobic core [Weiss, M.A., & Keutmann, H.T. (1990) Biochemistry 29, 9808-9813], nevertheless exhibit striking differences in packing interactions: Y10--but not F12--contributes to a contiguous region of the protein surface defined by putative specificity-determining residues. Alternating surface architectures may have implications for the mechanism of DNA recognition by the ZFY two-finger repeat.

PMID: 1854720 [PubMed - indexed for MEDLINE]



Source: PubMed
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