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Journal of Cell Science, Vol 90, 717-734, Copyright © 1988 by Company of Biologists

Submitted on February 23, 1988
Accepted on May 10, 1988

Molecular organization of cell-wall crystals from Chlamydomonas reinhardtii and Volvox carteri

URSULA W. GOODENOUGH 1 and JOHN E. HEUSER 1

1 Departments of Biology and Cell Biology/Physiology, Washington University St Louis MO 63130, USA

The extracellular matrices of Chlamydomonas reinhardtii and Volvox carteri contain homologous salt-extractable crystalline layers that will self-assemble in vitro. The organization of these crystals is examined using the quick-freeze deepetch technique. In C. reinhardtii, the outer layer of the crystal is an open polygonal weave (W6B); this is shown to be constructed from regular overlapping associations between the fibrous hydroxyproline-rich glycoprotein GP1. The inner layer of the crystal (W6A) is shown to be a copolymer of GP2 and GP3. The bulky globular domains of these glycoproteins form the rows of granules seen on the upper and lower surfaces of W6A in both Chlamydomonas and Volvox, and their filamentous domains interact to form a dense meshwork.

Key words: cell wall, Chlamydomonas reinhardtii, Volvox carteri

Submitted on February 23, 1988
Accepted on May 10, 1988




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© The Company of Biologists Ltd 1988