European Biophysics Journal

, Volume 40, Issue 5, pp 619–626 | Cite as

The effect of toxins on inorganic phosphate release during actin polymerization

  • Andrea Vig
  • Róbert Ohmacht
  • Éva Jámbor
  • Beáta Bugyi
  • Miklós Nyitrai
  • Gábor Hild
Original Paper

Abstract

During the polymerization of actin, hydrolysis of bound ATP occurs in two consecutive steps: chemical cleavage of the high-energy nucleotide and slow release of the γ-phosphate. In this study the effect of phalloidin and jasplakinolide on the kinetics of Pi release was monitored during the formation of actin filaments. An enzyme-linked assay based spectrophotometric technique was used to follow the liberation of inorganic phosphate. It was verified that jasplakinolide reduced the Pi release in the same way as phalloidin. It was not possible to demonstrate long-range allosteric effects of the toxins by release of Pi from F-actin. The products of ATP hydrolysis were released by denaturation of the actin filaments. HPLC analysis of the samples revealed that the ATP in the toxin-bound region was completely hydrolysed into ADP and Pi. The effect of both toxins can be sufficiently explained by local and mechanical blockade of Pi dissociation.

Keywords

Actin Phalloidin Jasplakinolide Inorganic phosphate Kinetics 

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Copyright information

© European Biophysical Societies' Association 2011

Authors and Affiliations

  • Andrea Vig
    • 1
  • Róbert Ohmacht
    • 2
  • Éva Jámbor
    • 2
  • Beáta Bugyi
    • 1
  • Miklós Nyitrai
    • 1
  • Gábor Hild
    • 1
  1. 1.Department of Biophysics, Faculty of MedicineUniversity of PécsPécsHungary
  2. 2.Department of Biochemistry and Medical Chemistry, Faculty of MedicineUniversity of PécsPécsHungary

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