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Trimming and solubilization of xyloglucan after deposition in the walls of cultured rose cells

Trimming and solubilization of xyloglucan after deposition in the walls of cultured rose cells,J. E. Thompson,S. C. Fry

Trimming and solubilization of xyloglucan after deposition in the walls of cultured rose cells   (Citations: 20)
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A pulse-chase technique involving the in vivo feeding of L-(1-3H)arabinose to suspension-cultured rose (Rosa) cells at 4 d and 9 d after subculture (fast- and slow-growing, respectively) was used to create a popu- lation of ( 3H)xyloglucan molecules and to follow their subsequent fate. The weight-average relative molecu- lar mass (Mw) of ( 3H)xyloglucan freshly deposited in the cell wall was ~ 160 000 and -240 000 in the fast- and slow-growing cells, respectively. The wall-bound (3H)xyloglucan of both cultures underwent a decrease in /Ww of ~ 40 000 during the first 2 d after the pulse- labelling. At the same time, 20-30% of the initially- deposited (3H)xyloglucan disappeared from the cell wall, and a similar amount appeared in solution in the culture medium. Its failure to remain bound to the cell wall and its low /Ww (~39 000) indicated that this sol- uble extracellular (3H)xyloglucan was derived from par- tial degradation of segments of wall-bound xyloglucan that were not directly hydrogen-bonded to microfibrils ('loose ends' and 'tethers'). The possible enzymic basis and biological roles of the degradation are discussed.
Published in 2010.
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