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  Dual effect of Ca2+ on ultrasonic ATPase activity and polymerization of muscle actin

Dancker, P., & Löw, I. (1977). Dual effect of Ca2+ on ultrasonic ATPase activity and polymerization of muscle actin. Biochimica et Biophysica Acta: BBA, 484(1), 169-176. doi:10.1016/0005-2744(77)90122-X.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0002-C7C9-B Version Permalink: https://hdl.handle.net/21.11116/0000-0002-C7CA-A
Genre: Journal Article

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BBA_484_1977_169.pdf (Any fulltext), 438KB
 
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 Creators:
Dancker, Peter1, Author           
Löw, Irmentraut1, Author           
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1Max Planck Institute for Medical Research, Max Planck Society, ou_1125545              

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 Abstract: Millimolar concentrations of Ca2+ stimulate actin polymerization whereas micromolar concentration of Ca2+ depress polymerization. This latter effect leads to a reduction of ATPase (ATP phosphohydrolase, EC 3.6.1.3) activity of actin during sonication of low Mg2+ concentrations and in the absence of KCl. In the presence of KCl (90 mM) there is activation of ATPase activity by micromolar Ca2+ concentrations. These Ca2+ effects are half-maximal at a Ca2+ concentration of 2 · 10−7 M. They can be explained by assuming that ATPase activity is optimal in a medium range of actin polymer stability and that micromolar Ca2+ concentrations tend to labilize and depolymerize F-actin.

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Language(s): eng - English
 Dates: 1977-03-012003-02-051977-09-15
 Publication Status: Issued
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/0005-2744(77)90122-X
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Title: Biochimica et Biophysica Acta : BBA
  Other : Biochimica et Biophysica Acta (BBA) - Biomembranes
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 484 (1) Sequence Number: - Start / End Page: 169 - 176 Identifier: Other: 1879-2642
CoNE: https://pure.mpg.de/cone/journals/resource/18792642