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Crystal structure of an engrailed homeodomain-DNA complex at 2.8 Å resolution: A framework for understanding homeodomain-DNA interactions

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Kissinger, Charles R., Liu, Beishan, Martin-Blanco, Enrique, Kornberg, Thomas B., Pabo, Carl O.·1990·Cell

Abstract

The crystal structure of a complex containing the engrailed homeodomain and a duplex DNA site has been determined at 2.8 A resolution and refined to a crystallographic R factor of 24.4%. In this complex, two separate regions of the 61 amino acid polypeptide contact a TAAT subsite. An N-terminal arm fits into the minor groove, and the side chains of Arg-3 and Arg-5 make contacts near the 5' end of this "core consensus" binding site. An alpha helix fits into the major groove, and the side chains of IIe-47 and Asn-51 contact base pairs near the 3' end of the TAAT site. This "recognition helix" is part of a structurally conserved helix-turn-helix unit, but these helices are longer than the corresponding helices in the lambda repressor, and the relationship between the helix-turn-helix unit and the DNA is significantly different.

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Metadata

Authors
Kissinger, C. R., Liu, B., Martin-Blanco, E., Kornberg, T. B., & Pabo, C. O.
Venue
Cell
Publisher
Elsevier BV
Published
1990-11
Volume
63
Issue
3
Pages
579-590
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2076849893
Cited by
986
References
0
FWCI
34.71
Type
journal article
Language
en
Open access
hybrid

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