SOLUTION STRUCTURES OF 2 ZINC-FINGER DOMAINS FROM SWI5 OBTAINED USING 2-DIMENSIONAL H-1 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY - A ZINC-FINGER STRUCTURE WITH A 3RD STRAND OF BETA-SHEET

被引:74
作者
NEUHAUS, D
NAKASEKO, Y
SCHWABE, JWR
KLUG, A
机构
关键词
DNA-BINDING PROTEINS; 3-DIMENSIONAL STRUCTURE; TRANSCRIPTIONAL ACTIVATOR PROTEINS; 2-DIMENSIONAL NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; ZINC-FINGERS;
D O I
10.1016/0022-2836(92)90846-C
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
This paper describes the detailed three-dimensional structures of two zinc-finger domains from the yeast transcription factor SWI5, calculated using the results of the n.m.r. experiments described in the accompanying paper. The structure of finger 2 is essentially similar to those previously obtained by others for isolated, synthetic single zinc-finger domains in solution, and for the three zinc-finger peptide Zif268 in its crystalline complex with DNA. The N-terminal half of the sequence forms a two-stranded, irregular β-sheet containing both of the metal-binding cysteine residues, while the remainder of the structure forms a helix. Approximately the first half of this helix is α-helical, whereas the C-terminal portion, including the two metal-binding histidine residues, is 310 helical. Four invariant hydrophobic residues form a core to the structure. In contrast to all previously described structures of zinc-finger domains, finger 1 has an additional strand in the β-sheet, formed by residues N-terminal to the formal start of the finger motif. This additional strand plays a role in stabilising the folded form of finger 1, since a two-finger peptide lacking the N-terminal residues showed folded structure in finger 2 but not in finger 1. © 1992.
引用
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页码:637 / 651
页数:15
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