2hio
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(New page: 200px<br /><applet load="2hio" size="450" color="white" frame="true" align="right" spinBox="true" caption="2hio, resolution 3.10Å" /> '''HISTONE OCTAMER (CHI...)
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Revision as of 09:40, 21 November 2007
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HISTONE OCTAMER (CHICKEN), CHROMOSOMAL PROTEIN
Overview
The structure of the octameric histone core of the nucleosome has been, determined by x-ray crystallography to a resolution of 3.1 A. The histone, octamer is a tripartite assembly in which a centrally located (H3-H4)2, tetramer is flanked by two H2A-H2B dimers. It has a complex outer surface;, depending on the perspective, the structure appears as a wedge or as a, flat disk. The disk represents the planar projection of a left-handed, proteinaceous superhelix with approximately 28 A pitch. The diameter of, the particle is 65 A and the length is 60 A at its maximum and, approximately 10 A at its minimum extension; these dimensions are in, agreement with those reported earlier by Klug et al. [Klug, A., Rhodes, D., Smith, J., Finch, J. T. & Thomas, J. O. (1980) Nature (London) 287, 509-516]. The folded histone chains are elongated rather than globular and, are assembled in a characteristic "handshake" motif. The individual, polypeptides share a common central structural element of the, helix-loop-helix type, which we name the histone fold.
About this Structure
2HIO is a Protein complex structure of sequences from Gallus gallus. Full crystallographic information is available from OCA.
Reference
The nucleosomal core histone octamer at 3.1 A resolution: a tripartite protein assembly and a left-handed superhelix., Arents G, Burlingame RW, Wang BC, Love WE, Moudrianakis EN, Proc Natl Acad Sci U S A. 1991 Nov 15;88(22):10148-52. PMID:1946434
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