title: The region in myosin S-1 that may be involved in energy transduction.
abstract: Newly-reported structural information about certain proximities between points on bound nucleotide and points on the heavy chain of myosin S-1 are incorporated into a previously-reported [Botts, J. Thomason, J.F. & Morales, M.F. Proc. Nat. Acad. Sci. USA, 86, 2204-2208 (1989)] structure of S-1. The resulting, enhanced structure is then used to identify some functionalities (e.g., the ATP-perturbable tryptophans), and to explain certain observations (e.g., some concerning the role of bound Mg2+ in the spectral response of TNBS-labelled Lys-83, and some concerning the response of the S-1 CD signal to nucleotide binding and to temperature change). These considerations lead to the suggestion that a strand of the 50 kDa "domain" (residues 510 to 540), and a strand of the 20 kDa 'domain' (residues 697-719) are involved in transmitting the effects of nucleotide binding and hydrolysis to the loop (constituted from the same "domain") that reaches a major (S-1)-actin interface.
authors.affiliation: Dept. of Physiology and Biophysics, University of the Pacific, San Francisco, CA 94115.
authors.forename: M F
authors.initials: MF
authors.lastname: Morales
authors.forename: K
authors.initials: K
authors.lastname: Ue
authors.forename: D B
authors.initials: DB
authors.lastname: Bivin
mesh_terms: D004735:Energy Transfer / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology; D015879:Myosin Subfragments / Q000737:chemistry*; D011487:Protein Conformation
chemical_list: D015879:Myosin Subfragments