127. Mizuta, S., Roberts, E. M., and R. M. Brown, Jr. 1989. A new cellulose synthesizing complex in Vaucheria hamata and its relation to microfibril assembly. In-Cellulose and Wood -Chemistry and Technology, Ed. C. Schuerch. John Wiley and Sons, Inc. N. Y., 659-676.

127. Synopsis

The relationship between the structure of a cellulose synthesizing enzyme complex (terminal complex or TC) and microfibril assembly in the xanthophycean alga Vaucheria hamata was investigated. Vaucheria TCs are roughly rectangular and composed of many diagonal rows of particles. The number of particles in a single diagonal row varies, but sixty percent of TC rows contain 6-8 particles. The ribbon-like microfibrils (MFs) of Vaucheria vary in width (21 + 10 nm) and are quite thin (ca. 1.5-3.0 nm). MFs consist of many small subfibrils (SFs), about 2 nm wide. From these data, a working model of MF assembly is suggested in which (1) a ribbon-like cellulose microfibril is synthesized by a single TC, (2) each subfibril is assembled along a single diagonal row of particles within the TC; (3) the number of glucan chains in each SF is correlated with the number of subunits per diagonal row; and (4) a single particle forms one (or very few) glucan chains.

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Last modified 27 October 2005.
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