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FEBS Lett. 1997 Dec 29;420(2-3):151-5.

Membrane association of sucrose synthase: changes during the graviresponse and possible control by protein phosphorylation.

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U.S. Department of Agriculture, Agricultural Research Service, Raleigh, NC, USA.
NC St U, Raleigh


Sucrose synthase (SuSy) plays an important role in sucrose degradation and occurs both as a soluble and as a membrane-associated enzyme in higher plants. We show that membrane association can vary in vivo in response to gravistimulation, apparently involving SuSy dephosphorylation, and is a reversible process in vitro. Phosphorylation of SuSy has little effect on its activity but decreases its surface hydrophobicity as reported with the fluorescent probe bis-ANS. We postulate that phosphorylation of SuSy (and perhaps other membrane proteins) is involved in the release of the membrane-bound enzyme in part as a result of decreased surface hydrophobicity.

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