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1yrn
From Proteopedia
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[[Image:1yrn.jpg|left|200px]] | [[Image:1yrn.jpg|left|200px]] | ||
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'''CRYSTAL STRUCTURE OF THE MATA1/MATALPHA2 HOMEODOMAIN HETERODIMER BOUND TO DNA''' | '''CRYSTAL STRUCTURE OF THE MATA1/MATALPHA2 HOMEODOMAIN HETERODIMER BOUND TO DNA''' | ||
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[[Category: Stark, M R.]] | [[Category: Stark, M R.]] | ||
[[Category: Wolberger, C.]] | [[Category: Wolberger, C.]] | ||
| - | [[Category: | + | [[Category: Complex]] |
| - | [[Category: | + | [[Category: Dna]] |
| - | [[Category: | + | [[Category: Dna-binding protein]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 16:41:42 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 13:41, 3 May 2008
CRYSTAL STRUCTURE OF THE MATA1/MATALPHA2 HOMEODOMAIN HETERODIMER BOUND TO DNA
Overview
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.
About this Structure
1YRN is a Protein complex structure of sequences from Saccharomyces cerevisiae. Full crystallographic information is available from OCA.
Reference
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 Page seeded by OCA on Sat May 3 16:41:42 2008
