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Probing Expansin Action Using Cellulose/hemicellulose Composites.

S. Whitney, M. J. Gidley, S. McQueen-Mason
Published 2000 · Medicine, Biology

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Cellulose-based composite materials containing xyloglucans or mannan-based polysaccharides have been shown to possess organisational features with many characteristics similar to primary plant cell walls. We have tested the effects of a typical alpha-expansin (CsExp1) on these composites using two different mechanical assays. We show that CsExp1 induces very rapid extension in composites containing tamarind xyloglucan under constant load. In contrast, expansin treatment had no effect in constant load extension assays using cellulose-only materials or in those carried out on composites containing glucomannan or galactomannan. We show that the effect of expansins is much smaller on composites made with short chain length xyloglucans than on those containing longer chains. In uniaxial extension tests we found that expansin could double the total extension (before failure) in xyloglucan composites and that the effects were again lower in composites containing shorter xyloglucans. We found no effect of expansin on uniaxial extensions with glucomannan or galactomannan. However, a significant effect of expansin on the uniaxial extension behaviour of cellulose-only material was observed. These experiments suggest that the target of CsExp1 in cell walls is probably the cellulose xyloglucan matrix, but that other (1-4) beta-glucan to (1-4) beta-glucan hydrogen bonded contacts can also serve as substrates.



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