Regulation by Ca(2+)-calmodulin of the Actin-bundling Activity of Physarum 210-kDa Protein

Overview

Journal J Muscle Res Cell Motil

Specialties Cell Biology
Physiology

Date 1992 Jun 1

PMID 1527219

Citations 1

Authors

R Ishikawa

T Okagaki

K Kohama

Affiliations

Soon will be listed here.

Abstract

From the plasmodia of a lower eukaryote, Physarum polycephalum, we have previously purified a 210-kDa protein that showed similar properties to those of smooth muscle caldesmon. Further characterization of the 210-kDa protein revealed that it bundled actin filaments. This bundling activity was inhibited by calmodulin in the presence of Ca2+. Unlike smooth muscle caldesmon, the 210-kDa protein bundled actin filaments whether or not a reducing agent, such as dithiothreitol, was present. The protein was shown to have two (or more) different actin-binding sites which were classified into salt-sensitive and salt-insensitive sites. Electron microscopy revealed that the 210-kDa protein was an elongated molecule (mean length, 97 +/- 25 nm) which was bent in the middle. The Stokes radius and sedimentation coefficient of the 210-kDa protein were 130 A and 2.9 S, respectively. An immunofluorescence study revealed that the 210-kDa protein colocalized with the bundles of actin filaments in thin-spread preparations of Physarum plasmodia, suggesting that the 210-kDa protein was regulating the appearance and disappearance of the actin bundles that are associated with the contraction-relaxation cycle of the plasmodia.

Citing Articles

Calcium inhibition as an intracellular signal for actin-myosin interaction.

Kohama K Proc Jpn Acad Ser B Phys Biol Sci. 2016; 92(10):478-498.

PMID: 27941307 PMC: 5328785. DOI: 10.2183/pjab.92.478.

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