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1yrn
From Proteopedia
| 1yrn, resolution 2.50Å () | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Gene: | MAT A1 RESIDUE 66-126 (Saccharomyces cerevisiae), MAT ALPHA2 RESIDUE 128-210 (Saccharomyces cerevisiae) | ||||||||
| Domains: | homeodomain, Homeobox | ||||||||
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||
CRYSTAL STRUCTURE OF THE MATA1/MATALPHA2 HOMEODOMAIN HETERODIMER BOUND TO DNA
The Saccharomyces cerevisiae MATa1 and MAT alpha 2 homeodomain proteins, which play a role in determining yeast cell type, form a heterodimer that binds DNA and represses transcription in a cell type-specific manner. Whereas the alpha 2 and a1 proteins on their own have only modest affinity for DNA, the a1/alpha 2 heterodimer binds DNA with high specificity and affinity. The three-dimensional crystal structure of the a1/alpha 2 homeodomain heterodimer bound to DNA was determined at a resolution of 2.5 A. The a1 and alpha 2 homeodomains bind in a head-to-tail orientation, with heterodimer contacts mediated by a 16-residue tail located carboxyl-terminal to the alpha 2 homeodomain. This tail becomes ordered in the presence of a1, part of it forming a short amphipathic helix that packs against the a1 homeodomain between helices 1 and 2. A pronounced 60 degree bend is induced in the DNA, which makes possible protein-protein and protein-DNA contacts that could not take place in a straight DNA fragment. Complex formation mediated by flexible protein-recognition peptides attached to stably folded DNA binding domains may prove to be a general feature of the architecture of other classes of eukaryotic transcriptional regulators.
Crystal structure of the MATa1/MAT alpha 2 homeodomain heterodimer bound to DNA., Li T, Stark MR, Johnson AD, Wolberger C, Science. 1995 Oct 13;270(5234):262-9. PMID:7569974
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1YRN is a 4 chains structure of sequences from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
- Li T, Stark MR, Johnson AD, Wolberger C. Crystal structure of the MATa1/MAT alpha 2 homeodomain heterodimer bound to DNA. Science. 1995 Oct 13;270(5234):262-9. PMID:7569974
Page seeded by OCA on Tue Feb 17 08:27:53 2009
