6bnp

CryoEM structure of MyosinVI-actin complex in the rigor (nucleotide-free) stateCryoEM structure of MyosinVI-actin complex in the rigor (nucleotide-free) state

6bnp, resolution 4.60Å Show:Asymmetric Unit Biological Assembly Structural highlights 6bnp is a 14 chain structure with sequence from Oryctolagus cuniculus and Pig. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: Gene: MYO6 (PIG) Experimental data: Check 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 Despite extensive scrutiny of the myosin superfamily, the lack of high-resolution structures of actin-bound states has prevented a complete description of its mechanochemical cycle and limited insight into how sequence and structural diversification of the motor domain gives rise to specialized functional properties. Here we present cryo-EM structures of the unique minus-end directed myosin VI motor domain in rigor (4.6 A) and Mg-ADP (5.5 A) states bound to F-actin. Comparison to the myosin IIC-F-actin rigor complex reveals an almost complete lack of conservation of residues at the actin-myosin interface despite preservation of the primary sequence regions composing it, suggesting an evolutionary path for motor specialization. Additionally, analysis of the transition from ADP to rigor provides a structural rationale for force sensitivity in this step of the mechanochemical cycle. Finally, we observe reciprocal rearrangements in actin and myosin accompanying the transition between these states, supporting a role for actin structural plasticity during force generation by myosin VI. Cryo-EM structures reveal specialization at the myosin VI-actin interface and a mechanism of force sensitivity.,Gurel PS, Kim LY, Ruijgrok PV, Omabegho T, Bryant Z, Alushin GM Elife. 2017 Dec 4;6. doi: 10.7554/eLife.31125. PMID:29199952 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Actin 3D structures Myosin 3D Structures