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Science 24 June 1966:
Vol. 152. no. 3730, pp. 1756 - 1757
DOI: 10.1126/science.152.3730.1756
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Articles

Actin: Volume Change on Transformation of G-Form to F-Form

Takamitsu Ikkai 1, Tatsuo Ooi 1, and Hajime Noguchi 2

1 Aichi College of Liberal Arts, Myodaiji-cho, Okazaki, Aichi, Japan
2 Department of Physics, Faculty of Science, Nagoya University, Nagoya, Japan

The volume change occurring on polymerizing actin was measured by dilatometry. A large positive value of + 391 ml/mole was obtained for the volume change during the transformation of G- to F-actin. This large increase in volume could be interpreted as arising from the local change in the ordered water structure on the protein's surface at polymerizing sites.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)