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Cellulose synthesis in plants requires -1,4-glucan chain
initiation, elongation, and termination. The process of chain
elongationis likely to be distinct from the process of chain
initiation.We demonstrate that a CesA glucosyltransferase initiates
glucanpolymerization by using sitosterol--glucoside (SG) as primer.Cotton fiber membranes synthesize sitosterol-cellodextrins (SCDs)from SG and uridine 5'-diphosphate-glucose (UDP-Glc) under
conditionsthat also favor cellulose synthesis. The cellulase encoded
bythe Korrigan (Kor) gene, required for
cellulose synthesis in plants,may function to cleave SG from the
growing polymer chain.
Section of Plant Biology, University of California Davis, One
Shields Avenue, Davis, CA 95616, USA.
*
Present address: Plant Gene Expression Center, 800 Buchanan Street,
Albany CA 94710-1198, USA.
Present address: National Institute of Agrobiological
Resources, Kannondai 2-1-2, Tsukuba, Ibaraki, Japan 305-8602.
To whom correspondence should be addressed: E-mail:
dpdelmer{at}ucdavis.edu
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