Chicken gizzard: Relation between calcium-activated phosphorylation and contraction

Phyllis E. Hoar, W. Glenn L. Kerrick, Paul S. Cassidy

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Abstract

Of the proteins in mechanically disrupted chicken gizzard fibers (no functional sarcolemma) only the 20,000-dalton light chains of myosin underwent large (a2+- and Sr2+-dependent changes in phosphorylation. Phosphorylation closely corresponded with the Ca2+- and Sr2+-activated tensions. Adnosine 5'-O (3'- thiotriphosphate) only in the presence of Ca2+ induced irreversible Ca2+-insensitive activation of tension and thiophosphorylation of the 20,000-dalton light chains, and blocked incorporation of 32P from [γ-32P]adenosine triphosphate into the myosin light chains.

Original languageEnglish (US)
Pages (from-to)503-506
Number of pages4
JournalScience
Volume204
Issue number4392
DOIs
StatePublished - Jan 1 1979

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