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Supercoiled protein motifs: the collagen triple-helix and the α-helical coiled coil

Beck, Konrad and Brodsky, B. 1998. Supercoiled protein motifs: the collagen triple-helix and the α-helical coiled coil. Journal of Structural Biology 122 (1-2) , pp. 17-29. 10.1006/jsbi.1998.3965

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Abstract

The collagen triple-helix and the alpha-helical coiled coil represent the two basic supercoiled multistranded protein motifs. Originally they were characterized in fibrous proteins, but have been found more recently in a number of other proteins containing rod-shaped domains. Coiled-coil domains are responsible for the oligomerization of proteins, as well as other specific functions, while the triple-helix domains associate to form supramolecular structures and bind a variety of ligands. Both structures were originally solved by fiber diffraction, and recent crystallographic studies on small proteins and peptide models have confirmed the structure and provided molecular details. The differences in the molecular conformations of these two motifs and the interactions stabilizing these conformations are discussed. The molecular structures of both motifs constrain the amino acid sequence to recognizable patterns, requiring the (Gly-X-Y)n repeating sequence for the collagen triple-helix and a less stringent heptad repeat requirement (h-x-x-h-x-x-x)n for the coiled-coil domains, where h represents hydrophobic residues. The features and roles of these supercoiled domains in proteins are considered when they are found adjacent in the same protein.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Subjects: Q Science > QD Chemistry
Q Science > QH Natural history > QH301 Biology
Uncontrolled Keywords: α-helix; coiled coils; collagen; extracellular matrix; multidomain proteins; peptides; protein folding; protein motifs; protein structure; sequence patterns
Publisher: Elsevier
ISSN: 1047-8477
Last Modified: 04 Jun 2017 03:04
URI: http://orca.cf.ac.uk/id/eprint/16311

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