Preparation of frog myosin. Isolation and characterization of the light chains

Frog myosin can be prepared with a good yield by precipitation of a high ionic strength extract between I 0.20 and 0.05 or by ammonium sulphate fractionation of actomyosin in the presence of Mg-ATP. Two alkali light chains, LC1 and LC3, along with one DTNB light chain LC2 have been isolated by chrom...

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Bibliographic Details
Published inJournal of muscle research and cell motility Vol. 1; no. 1; p. 61
Main Authors Focant, B, Huriaux, F
Format Journal Article
LanguageEnglish
Published Netherlands 01.03.1980
Subjects
Amino Acids - analysis
Animals
Isoelectric Point
Macromolecular Substances
Molecular Weight
Myosins - isolation & purification
Peptide Fragments - analysis
Rana esculenta
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Summary:Frog myosin can be prepared with a good yield by precipitation of a high ionic strength extract between I 0.20 and 0.05 or by ammonium sulphate fractionation of actomyosin in the presence of Mg-ATP. Two alkali light chains, LC1 and LC3, along with one DTNB light chain LC2 have been isolated by chromatography on ion exchange cellulose after urea dissociation. A supplementary light chain LC1d present in variable amounts from one preparation to the other corresponds to a proteolysis product of LC1. Their stoichiometry, molecular weight, amino acid composition, isoelectric point and peptide map have been determined. Their general proportions and structural properties show many similarities with rabbit skeletal muscle light chains. Amino acid compositions and peptide maps confirm that the additional band LC1d comes from a proteolytic degradation affecting the N-terminal part of LC1.
ISSN:0142-4319
DOI:10.1007/BF00711925