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. 1975 Jul;56(1):34–38. doi: 10.1104/pp.56.1.34

The Site of Cellulose Synthesis

Cell Surface and Intracellular β-1, 4-Glucan (Cellulose) Synthetase Activities in Relation to the Stage and Direction of Cell Growth 1

Gordon Shore a,2, Yves Raymond a, Gordon A Maclachlan a
PMCID: PMC541293  PMID: 16659253

Abstract

β-1, 4-Glucan (cellulose) synthetase activity (UDP-glucose: β-1, 4-glucan-glucosyl transferase) present at cell surfaces of growing regions of Pisum sativum epicotyl was assayed by supplying UDP-14C-glucose directly to thin slices of tissue. Initial rates of glucosyl transfer under these conditions approached the rates of cellulose deposition observed in vivo in intact tissue at various stages of growth. Normal tissue homogenization procedures destroyed the high surface activity, although a small amount of residual activity (3-10% of total) could be detected in particulate fractions. In homogenates from elongating tissue, the residual activity was almost entirely associated with Golgi membrane. In homogenates of tissue which had ceased elongating, whether because of normal maturation or treatment with ethylene (or high levels of auxin), the activity was present in Golgi plus a membrane fraction rich in smooth endoplasmic reticulum vesicles. It is suggested that cellulose synthetase activity associated with these two organelles represents intracellular enzyme in transit to specific sites of cellulose synthesis and microfibrillar orientation at the cell surface.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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