Figure 16-42. Microtubule sliding in an axoneme.

Figure 16-42Microtubule sliding in an axoneme

Electron micrograph of an isolated axoneme (from a cilium of Tetrahymena) that has been briefly exposed to the proteolytic enzyme trypsin to loosen the protein ties that normally hold it together. Following treatment with ATP, the individual microtubule doublets slide against each other, as shown schematically in Figure 16-43A. Because there are nine microtubule doublets in the axoneme, the original structure can increase as much as ninefold in length. (From F.D. Warner and D.R. Mitchell, J. Cell Biol. 89:35-44, 1981, by copyright permission of the Rockefeller University Press.)

From: Cilia and Centrioles

Cover of Molecular Biology of the Cell
Molecular Biology of the Cell. 3rd edition.
Alberts B, Bray D, Lewis J, et al.
New York: Garland Science; 1994.
Copyright © 1994, Bruce Alberts, Dennis Bray, Julian Lewis, Martin Raff, Keith Roberts, and James D Watson.

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