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Solution structure of the DNA-binding domain of Cd2-GAL4 from S. cerevisiae.

Abstract：

:The GAL4 protein activates transcription of the genes required for galactose utilization in Saccharomyces cerevisiae. The protein, consisting of 881 amino acids, is dimeric when bound to one of the approximately twofold symmetrical DNA sites present in the galactose upstream activating sequence (UASG). Here we use two-dimensional NMR spectroscopy to determine the structure of an amino-terminal fragment of GAL4 (residues 1-65). This fragment, a monomer in solution, binds as a dimer specifically to UASG-containing DNA. Residues 9-40 form a well defined, compact globular cluster, whereas residues 1-8 and 41-66 show considerable conformational mobility in the absence of DNA. The compact domain contains a motif in which six cysteines, located on two symmetrically related helix/extended strand units connected by a long loop, coordinate two central zinc ions, forming a bimetal-thiolate cluster. The zincs were replaced by NMR-active 113Cd in most of our work and structural parameters are therefore derived from the Cd2-protein. The structure obtained for the GAL4 DNA-binding domain represents a novel DNA-binding motif. Essentially the same conformation is observed for the compact domain in solution using NMR techniques as was seen for the central core of the N-terminal fragment bound to DNA using crystallographic techniques. Thus, the core of the DNA-binding domain changes little upon binding DNA.

journal_name

Nature

journal_title

Nature

authors

Baleja JD,Marmorstein R,Harrison SC,Wagner G

doi

10.1038/356450a0

keywords:

subject

Has Abstract

pub_date

1992-04-02 00:00:00

pages

450-3

issue

6368

eissn

0028-0836

issn

1476-4687

journal_volume

356

pub_type

杂志文章

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