title: Amino acid sequence of the amino-terminal 24 kDa fragment of the heavy chain of chicken gizzard myosin.
abstract: Chicken gizzard myosin was modified with N-iodoacetyl-N'-(5-sulfo-1-naphthyl)-ethylenediamine (IAEDANS) in the presence of ATP and in 0.15 M KCl, where the myosin assumed 10S conformation. From the tryptic digest of the modified myosin, a fluorescent fragment (24 kilodaltons) was isolated by gel filtration on a Sephadex G-100 column followed by chromatography on a CM 52 column. The amino acid sequence of the fragment was analyzed by conventional methods, and was: (S,Z)K-P-L-S-D-D-E-K-F-L-F-V-D-K-N-F-V-N-N-P-L-A-Q-A-D-W-S-A-K-K- L-V-W-V-P-S-E-K-H-G-F-E-A-A-S-I-K-E-E-K-G-D-E-V-T-V-E-L-Q-E-N-G-K-K- V-T-L-S-K-D-D-I-Q-K-M-N-P-P-K-F-S-K-V-E-D-M-A-E-L-T-C-L-N-E-A-S-V-L- H-N-L-R-E-R-Y-F-S-G-L-I-Y-T-Y-S-G-L-F-C-V-V-I-N-P-Y-K-Q-L-P-I-Y-S-E-K-I- I-D-M-Y-K-G-K-K-R-H-E-M-P-P-H-I-Y-A-I-A-D-T-A-Y-R-S-M-L-Q-D-R-E-D-Q- S-I-L-C-T-G-E-S-G-A-G-K-T-E-N-T-K-K-V-I-Q-Y-L-A-V-V-A-S-S-H-K-G-K. The amino-terminus was blocked, and the fragment was assigned as an amino-terminal part of the heavy chain of gizzard myosin. Position 127 was occupied by epsilon-N-trimethyllysine. Trp-130 of rabbit skeletal myosin heavy chain, which was reported to cross-link to an azide derivative of ATP by Okamoto and Yount (Proc. Natl. Acad. Sci. U.S. 82, 1575-1579 (1985], was replaced by glutamine in gizzard myosin. Cys-93 of the fragment is the amino acid residue whose reaction with IAEDANS alters the ATPase activity of gizzard myosin (Onishi, H. (1985) J. Biochem. 98, 81-86).
authors.affiliation: Department of Biochemistry, Nagasaki University School of Medicine.
authors.forename: T
authors.initials: T
authors.lastname: Maita
authors.forename: H
authors.initials: H
authors.lastname: Onishi
authors.forename: E
authors.initials: E
authors.lastname: Yajima
authors.forename: G
authors.initials: G
authors.lastname: Matsuda
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002645:Chickens; D003488:Cyanogen Bromide; D005895:Gizzard, Avian / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009130:Muscle, Smooth / Q000378:metabolism; D015879:Myosin Subfragments; D009218:Myosins / Q000235:genetics*; D009928:Organ Specificity; D010446:Peptide Fragments / Q000032:analysis / Q000235:genetics*; D010447:Peptide Hydrolases; D012689:Sequence Homology, Nucleic Acid; D013045:Species Specificity
chemical_list: D015879:Myosin Subfragments; D010446:Peptide Fragments; D010447:Peptide Hydrolases; D009218:Myosins; D003488:Cyanogen Bromide