1qag
From Proteopedia
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Actin binding region of the dystrophin homologue utrophin
Overview
BACKGROUND: Utrophin is a large multidomain protein that belongs to a, superfamily of actin-binding proteins, which includes dystrophin, alpha-actinin, beta-spectrin, fimbrin, filamin and plectin. All the, members of this family contain a common actin-binding region at their N, termini and perform a wide variety of roles associated with the actin, cytoskeleton. Utrophin is the autosomal homologue of dystrophin, the, protein defective in the X-linked Duchenne and Becker muscular, dystrophies, and upregulation of utrophin has been suggested as a, potential therapy for muscular dystrophy patients. RESULTS: The structure, of the actin-binding region of utrophin, consisting of two, calponin-homology (CH) domains, has been solved at 3.0 A resolution. It is, composed of an antiparallel dimer with each of the monomers being present, in an extended dumbell shape and the two CH domains being separated by a, long central helix. This extended conformation is in sharp contrast to the, compact monomer structure of the N-terminal actin-binding region of, fimbrin. CONCLUSIONS: The crystal structure of the actin-binding region of, utrophin suggests that these actin-binding domains may be more flexible, than was previously thought and that this flexibility may allow domain, reorganisation and play a role in the actin-binding mechanism. Thus, utrophin could possibly bind to actin in an extended conformation so that, the sites previously identified as being important for actin binding may, be directly involved in this interaction.
About this Structure
1QAG is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structure of the actin-binding region of utrophin reveals a head-to-tail dimer., Keep NH, Winder SJ, Moores CA, Walke S, Norwood FL, Kendrick-Jones J, Structure. 1999 Dec 15;7(12):1539-46. PMID:10647184
Page seeded by OCA on Mon Nov 12 18:51:56 2007
