Publication Date:
1994-01-14
Description:
The structure of the DNA binding domain, determined at 1.8 angstrom resolution, contains a three-helix bundle that is capped by a four-stranded antiparallel beta sheet. This structure is a variant of the helix-turn-helix motif, typified by catabolite activator protein. In the heat shock transcription factor, the first helix of the motif (alpha 2) has an alpha-helical bulge and a proline-induced kink. The angle between the two helices of the motif (alpha 2 and alpha 3) is about 20 degrees smaller than the average for canonical helix-turn-helix proteins. Nevertheless, the relative positions of the first and third helices of the bundle (alpha 1 and alpha 3) are conserved. It is proposed here that the first helix of the three-helix bundle be considered a component of the helix-turn-helix motif.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harrison, C J -- Bohm, A A -- Nelson, H C -- GM08295/GM/NIGMS NIH HHS/ -- GM44086/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1994 Jan 14;263(5144):224-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cell Biology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8284672" target="_blank"〉PubMed〈/a〉
Keywords:
Amino Acid Sequence
;
Crystallography, X-Ray
;
DNA/*metabolism
;
DNA-Binding Proteins/*chemistry/metabolism
;
*Heat-Shock Proteins
;
*Helix-Loop-Helix Motifs
;
Models, Molecular
;
Molecular Sequence Data
;
Protein Structure, Secondary
;
Transcription Factors/*chemistry
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
