Xylan glucuronic acid side chains fix suberin-like aliphatic compounds to wood cell walls. Derba-Maceluch, M., Mitra, M., Hedenström, M., Liu, X., Gandla, M. L., Barbut, F. R., Abreu, I. N., Donev, E. N., Urbancsok, J., Moritz, T., Jönsson, L. J., Tsang, A., Powlowski, J., Master, E. R., & Mellerowicz, E. J. New Phytologist, 238(1):297–312, January, 2023. _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/nph.18712![Xylan glucuronic acid side chains fix suberin-like aliphatic compounds to wood cell walls [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Wood is the most important repository of assimilated carbon in the biosphere, in the form of large polymers (cellulose, hemicelluloses including glucuronoxylan, and lignin) that interactively form a composite, together with soluble extractives including phenolic and aliphatic compounds. Molecular interactions among these compounds are not fully understood. We have targeted the expression of a fungal α-glucuronidase to the wood cell wall of aspen (Populus tremula L. × tremuloides Michx.) and Arabidopsis (Arabidopsis thaliana (L.) Heynh), to decrease contents of the 4-O-methyl glucuronopyranose acid (mGlcA) substituent of xylan, to elucidate mGlcA's functions. The enzyme affected the content of aliphatic insoluble cell wall components having composition similar to suberin, which required mGlcA for binding to cell walls. Such suberin-like compounds have been previously identified in decayed wood, but here, we show their presence in healthy wood of both hardwood and softwood species. By contrast, γ-ester bonds between mGlcA and lignin were insensitive to cell wall-localized α-glucuronidase, supporting the intracellular formation of these bonds. These findings challenge the current view of the wood cell wall composition and reveal a novel function of mGlcA substituent of xylan in fastening of suberin-like compounds to cell wall. They also suggest an intracellular initiation of lignin–carbohydrate complex assembly.
@article{derba-maceluch_xylan_2023,
title = {Xylan glucuronic acid side chains fix suberin-like aliphatic compounds to wood cell walls},
volume = {238},
issn = {1469-8137},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/nph.18712},
doi = {10.1111/nph.18712},
abstract = {Wood is the most important repository of assimilated carbon in the biosphere, in the form of large polymers (cellulose, hemicelluloses including glucuronoxylan, and lignin) that interactively form a composite, together with soluble extractives including phenolic and aliphatic compounds. Molecular interactions among these compounds are not fully understood. We have targeted the expression of a fungal α-glucuronidase to the wood cell wall of aspen (Populus tremula L. × tremuloides Michx.) and Arabidopsis (Arabidopsis thaliana (L.) Heynh), to decrease contents of the 4-O-methyl glucuronopyranose acid (mGlcA) substituent of xylan, to elucidate mGlcA's functions. The enzyme affected the content of aliphatic insoluble cell wall components having composition similar to suberin, which required mGlcA for binding to cell walls. Such suberin-like compounds have been previously identified in decayed wood, but here, we show their presence in healthy wood of both hardwood and softwood species. By contrast, γ-ester bonds between mGlcA and lignin were insensitive to cell wall-localized α-glucuronidase, supporting the intracellular formation of these bonds. These findings challenge the current view of the wood cell wall composition and reveal a novel function of mGlcA substituent of xylan in fastening of suberin-like compounds to cell wall. They also suggest an intracellular initiation of lignin–carbohydrate complex assembly.},
language = {en},
number = {1},
urldate = {2023-03-10},
journal = {New Phytologist},
author = {Derba-Maceluch, Marta and Mitra, Madhusree and Hedenström, Mattias and Liu, Xiaokun and Gandla, Madhavi L. and Barbut, Félix R. and Abreu, Ilka N. and Donev, Evgeniy N. and Urbancsok, János and Moritz, Thomas and Jönsson, Leif J. and Tsang, Adrian and Powlowski, Justin and Master, Emma R. and Mellerowicz, Ewa J.},
month = jan,
year = {2023},
note = {\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1111/nph.18712},
keywords = {Populus, lignin-carbohydrate complexes (LCCs), lignin–carbohydrate complexes, saccharification, suberin, wood cell wall, xylan},
pages = {297--312},
}
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