Xyloglucan−pectin linkages are formed intra-protoplasmically, contribute to wall-assembly, and remain stable in the cell wall

@article{Popper2007XyloglucanpectinLA,
  title={Xyloglucan−pectin linkages are formed intra-protoplasmically, contribute to wall-assembly, and remain stable in the cell wall},
  author={Zo{\"e} A Popper and Stephen c. Fry},
  journal={Planta},
  year={2007},
  volume={227},
  pages={781-794}
}
We tested two hypotheses for the mechanism by which xyloglucan–pectin covalent bonds are formed in Arabidopsis cell cultures. Hypothesis 1 proposed hetero-transglycosylation, with xyloglucan as donor substrate and a rhamnogalacturonan-I (RG-I) side-chain as acceptor. We looked for enzyme activities that catalyse this reaction using α-(1→5)-l-[3H]arabino- or β-(1→4)-d-[3H]galacto-oligosaccharides as model acceptor substrates. The 3H-oligosaccharides were supplied (with or without added… CONTINUE READING
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