1g39: Difference between revisions
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{{STRUCTURE_1g39| PDB=1g39 | SCENE= }} | |||
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'''WILD-TYPE HNF-1ALPHA DIMERIZATION DOMAIN''' | '''WILD-TYPE HNF-1ALPHA DIMERIZATION DOMAIN''' | ||
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==About this Structure== | ==About this Structure== | ||
1G39 is a [[Single protein]] structure | 1G39 is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1G39 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Holton, J.]] | [[Category: Holton, J.]] | ||
[[Category: Rose, R B.]] | [[Category: Rose, R B.]] | ||
[[Category: | [[Category: Dimerization domain]] | ||
[[Category: | [[Category: Four-helix bundle]] | ||
[[Category: | [[Category: Transcription factor]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 17:04:59 2008'' | |||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | |||
Revision as of 14:05, 2 May 2008
WILD-TYPE HNF-1ALPHA DIMERIZATION DOMAIN
Overview
The N-terminal dimerization domain of the transcriptional activator hepatocyte nuclear factor-1alpha (HNF-1alpha) is essential for DNA binding and association of the transcriptional coactivator, DCoH (dimerization cofactor of HNF-1). To investigate the basis for dimerization of HNF-1 proteins, we determined the 1.2 A resolution X-ray crystal structure of the dimerization domain of HNF-1alpha (HNF-p1). Phasing was facilitated by devising a simple synthesis for Fmoc-selenomethionine and substituting leucine residues with selenomethionine. The HNF-1 dimerization domain forms a unique, four-helix bundle that is preserved with localized conformational shifts in the DCoH complex. In three different crystal forms, HNF-p1 displays subtle shifts in the conformation of the interhelix loop and the crossing angle between the amino- and carboxyl-terminal helices. In all three crystal forms, the HNF-p1 dimers pair through an exposed hydrophobic surface that also forms the binding site for DCoH. Conserved core residues in the dimerization domain of the homologous transcriptional regulator HNF-1beta rationalize the functional heterodimerization of the HNF-1alpha and HNF-1beta proteins. Mutations in HNF-1alpha are associated with maturity-onset diabetes of the young type 3 (MODY3), and the structure of HNF-p1 provides insights into the effects of three MODY3 mutations.
About this Structure
1G39 is a Single protein structure. Full crystallographic information is available from OCA.
Reference
High-resolution structure of the HNF-1alpha dimerization domain., Rose RB, Endrizzi JA, Cronk JD, Holton J, Alber T, Biochemistry. 2000 Dec 12;39(49):15062-70. PMID:11106484 Page seeded by OCA on Fri May 2 17:04:59 2008
