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J. Biol. Chem., Vol. 263, Issue 15, 7186-7189, 05, 1988

Rheology of G-actin solutions

KS Zaner, RG King, J Newman, KL Schick, R Furukawa and BR Ware
Hematology-Oncology Unit, Massachusetts General Hospital, Boston 02114.

Recent reports that dilute solutions of G-actin form viscoelastic gels have been investigated using several experimental variations of three distinct physical techniques in independent laboratories. Direct measurement of storage and loss moduli were made using two rheometers of different design. Measurements of the diffusion of G-actin and of tracer particles added to G-actin solutions were carried out using dynamic light scattering and fluorescence photobleaching recovery techniques. Measurements were performed over a period of many hours, on actin solutions prepared under conditions for which anomalous gelation had been reported. All data from this investigation are consistent with the conclusion that dilute G-actin solutions behave as newtonian liquids.
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