Xylan decoration patterns and the plant secondary cell wall molecular architecture
Biochemical Society Transactions
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Busse-Wicher, M., Grantham, N. J., Lyczakowski, J., Nikolovski, N., & Dupree, P. (2016). Xylan decoration patterns and the plant secondary cell wall molecular architecture. Biochemical Society Transactions, 44 74-78. https://doi.org/10.1042/BST20150183
The molecular architecture of plant secondary cell walls is still not resolved. There are several proposed structures for cellulose fibrils, the main component of plant cell walls, and the conformation of other molecules is even less well known. GUX enzymes, in CAZy family GT8, decorate the xylan backbone with various specific patterns of glucuronic acid. It was recently discovered that dicot xylan has a domain with the side chain decorations distributed on every second unit of the backbone (xylose). If the xylan backbone folds in a similar way to glucan chains in cellulose (2-fold helix), this kind of arrangement may allow the undecorated side of the xylan chain to hydrogen bond with the hydrophilic surface of cellulose microfibrils. Molecular dynamic simulations suggest that such interactions are energetically stable. We discuss the possible role of this xylan decoration pattern in building of the plant cell wall.
We thank Nadine Anders for helpful comments on the manuscript. The work was supported by a Leverhulme Trust Programme Grant : The Centre for Natural Material Innovation and the Biotechnology and Biological Sciences Research Council grant numbers [BB/K005537/1] and [BB/G016240/1].
External DOI: https://doi.org/10.1042/BST20150183
This record's URL: https://www.repository.cam.ac.uk/handle/1810/252714