5cmv

Ultrafast dynamics in myoglobin: dark-state, CO-ligated structure

spinqualitylabelsall models 5cmv, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5cmv is a 1 chain structure with sequence from Equus caballus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CMO, HEM, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [MYG_HORSE] Serves as a reserve supply of oxygen and facilitates the movement of oxygen within muscles. Publication Abstract from PubMed The hemoprotein myoglobin is a model system to study protein dynamics. We used time-resolved serial femtosecond crystallography at an x-ray free-electron laser to resolve the ultrafast structural changes taking place in the carbonmonoxy myoglobin complex upon photolysis of the Fe-CO bond. Structural changes appear throughout the protein within 500 fs with the C-, F- and H-helices moving away from the heme and the E- and A-helices moving toward it. These collective movements are predicted by quantum mechanics/molecular mechanics simulations. Together with the observed oscillations of residues contacting the heme, the calculations support predictions that an immediate collective response of the protein takes place upon ligand dissociation due to coupling of vibrational modes of the heme to global modes of the protein. Direct observation of ultrafast collective motions in CO myoglobin upon ligand dissociation.,Barends TR, Foucar L, Ardevol A, Nass K, Aquila A, Botha S, Doak RB, Falahati K, Hartmann E, Hilpert M, Heinz M, Hoffmann MC, Kofinger J, Koglin JE, Kovacsova G, Liang M, Milathianaki D, Lemke H, Reinstein J, Roome CM, Shoeman RL, Williams GJ, Burghardt I, Hummer G, Boutet S, Schlichting I Science. 2015 Sep 10. pii: aac5492. PMID:26359336 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Myoglobin 3D structures

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