5jlf

Structure of the F-actin-tropomyosin complex (Reprocessed)

Loading... Status: waiting for Mol* initialization Structural highlights 5jlf is a 7 chain structure with sequence from Mus musculus and Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.6Å Ligands: ADP, HIC, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ACTS_RABIT Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. Publication Abstract from PubMed The interaction of myosin with actin filaments is the central feature of muscle contraction and cargo movement along actin filaments of the cytoskeleton. The energy for these movements is generated during a complex mechanochemical reaction cycle. Crystal structures of myosin in different states have provided important structural insights into the myosin motor cycle when myosin is detached from F-actin. The difficulty of obtaining diffracting crystals, however, has prevented structure determination by crystallography of actomyosin complexes. Thus, although structural models exist of F-actin in complex with various myosins, a high-resolution structure of the F-actin-myosin complex is missing. Here, using electron cryomicroscopy, we present the structure of a human rigor actomyosin complex at an average resolution of 3.9 A. The structure reveals details of the actomyosin interface, which is mainly stabilized by hydrophobic interactions. The negatively charged amino (N) terminus of actin interacts with a conserved basic motif in loop 2 of myosin, promoting cleft closure in myosin. Surprisingly, the overall structure of myosin is similar to rigor-like myosin structures in the absence of F-actin, indicating that F-actin binding induces only minimal conformational changes in myosin. A comparison with pre-powerstroke and intermediate (Pi-release) states of myosin allows us to discuss the general mechanism of myosin binding to F-actin. Our results serve as a strong foundation for the molecular understanding of cytoskeletal diseases, such as autosomal dominant hearing loss and diseases affecting skeletal and cardiac muscles, in particular nemaline myopathy and hypertrophic cardiomyopathy. Cryo-EM structure of a human cytoplasmic actomyosin complex at near-atomic resolution.,von der Ecken J, Heissler SM, Pathan-Chhatbar S, Manstein DJ, Raunser S Nature. 2016 Jun 30;534(7609):724-8. PMID:27324845 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Actin 3D structures Tropomyosin

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