5bvr
From Proteopedia
Actin binding domain of alpha-actinin from Schizosaccharomyces pombe
Structural highlights
FunctionAIN1_SCHPO Binds to actin and is involved in actin-ring formation and organization. Plays a role in cytokinesis and is involved in septation.[1] Publication Abstract from PubMedThe actin cytoskeleton plays a fundamental role in eukaryotic cells. Its reorganization is regulated by a plethora of actin-modulating proteins, such as a-actinin. In higher organisms, alpha-actinin is characterized by the presence of three distinct structural domains: an N-terminal actin-binding domain and a C-terminal region with EF-hand motif separated by a central rod domain with four spectrin repeats. Sequence analysis has revealed that the central rod domain of alpha-actinin from the fission yeast Schizosaccharomyces pombe consists of only two spectrin repeats. To obtain a firmer understanding of the structure and function of this unconventional alpha-actinin, we have cloned and characterized each structural domain. Our results show that this a-actinin isoform is capable of forming dimers and that the rod domain is required for this. However, its actin-binding and cross-linking activity appears less efficient compared to conventional alpha-actinins. The solved crystal structure of the actin-binding domain indicates that the closed state is stabilised by hydrogen bonds and a salt bridge not present in other alpha-actinins, which may reduce the affinity for actin. Characterisation of Schizosaccharomyces pombe alpha-actinin.,Addario B, Sandblad L, Persson K, Backman L PeerJ. 2016 Mar 28;4:e1858. doi: 10.7717/peerj.1858. eCollection 2016. PMID:27069798[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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