Ca2+-sensitivity of actomyosin ATPase purified from Physarum polycephalum.

Abstract:

:A contractile protein closely resembling natural actomyosin (myosin B) of rabbit skeletal muscle was extracted from plasmodia of the slime mold, Physarum polycephalum, by protecting the SH-groups with beta-mercaptoethanol or dithiothreitol. Superprecipitation of the protein induced by Mg2+-ATP at low ionic strength was observed only in the presence of very low concentrations of free Ca2+ ions, and the Mg2+-ATPase [EC 3.6.1.3] reaction was activated 2- to 6-fold by 1 muM of free Ca2+ ions. Crude myosin and actin fractions were separated by centrifuging plasmodium myosin B in the presence of Mg2+-PPi at high ionic strength. The crude myosin showed both EDTA- and Ca2+-activated ATPase activities. The Mg2+-ATPase activity of crude myosin from plasmodia was markedly activated by the addition of pure F-actin from rabbit skeletal muscle. Addition of the F-action-regulatory protein complex prepared from rabbit skeletal muscle as well as the actin fraction of plasmodium caused the same degree of activation as the addition of pure F-actin only in the presence of very low concentrations of Ca2+ ion

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Kato T,Tonomura Y

keywords:

subject

Has Abstract

pub_date

1975-06-01 00:00:00

pages

1127-34

issue

6

eissn

0021-924X

issn

1756-2651

journal_volume

77

pub_type

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