I am studying the plant cell wall and I have a question concerning its chemical composition. There is a relationship between lignin and arabinoxylan. Can arabinoxylan help the lignin polymerization? How? Thickened cell wall can present both arabinoxylan and lignin?
Thank you all for the attention and help.
Best
Joao Paulo
In the sense that both lignin and arabinoxylan appear in cell walls and provide the walls structure, they are related. However, they have little in common chemically or biologically. Lignin is a cross-linked phenolic macromolecule made from subunits typically including p-coumaryl, coniferyl, and sinapyl alcohol. It is not, strictly speaking, a polymer because the subunits do not regularly repeat. It is amorphous and randomly arranged and generally is somewhat hydrophobic. Arabinoxylan is a radomly arranged, branched polysaccharide or hemicellulose containing arabinose and xylose as its primary base sugars. This structure distinguishes it from cellulose, which is a sucrose-based polymer that is also much larger/longer than hemicellulose. It hydrates easily and often links (covalently) to ferulic acid and other phenolic acids. It often acts as a reservoir for these acids. The phenolic compounds in these acids are the chemical structures most closely related to lignin.
Dear Dr. Baxter,
Thank you for your message. You mention one specific aspect that I have interest: the relation between arabinoxylan and the ferrulic acid and other phenolic compounds. Based on this aspect, is it possible that cells with fast lignin deposition (
I have no data to point to on this issue. All things are possible, but the binding of phenolic compounds is likely quite slow, both in formation and destruction, so I am not sure how effective this would be. Others may have some experience with this of which I am unaware.
Dear Dr. Baxter,
I appreciate your attention. I am glad to hear your explanation. It sure helps a lot and clarifying my questions related to arabinoxylan and lignin relationship.
Thanks and regards,
Joao Paulo
Hi Joao Paulo!
I really recommend the read of this article, cause it explained the relationship between ferulic acid esterified at arabinoxylans and phenolic polimers like lignin. In species as maize the ferulic acid could act as a nucleation molecule to the lignin biosynthesis and could play a role in the localization and the initiation of the synthesis of these molecules.
http://link.springer.com/article/10.1007/s11101-010-9165-1
I also recommend all the articles about hydroxycinnamates in grass cell walls writed by John Ralph.
Dear Asier,
Thanks for help me with this issue. Your comment was amazing. I will read this manuscript and give you a feedback. Thanks for your kindly help.
Regards,
Joao
Regarding arabinoxylan and lignin is not clear correlation, thinking of a linear correlation. But, is known that ferulic acid is ester-linked to arabinoxylan and ferulic acid acts as a nucleation site for lignin polymerization.
This paper may explain better.
Article Ferulic acid: A key component in grass lignocellulose recalc...
Hope this will help.
Best regards
Dyoni
Thanks Dr. Dyoni,
Your answer helps to clarify the topic.
Regards,
João
You're welcome João.
If you are working with Feruloylation and lignin, I'm available to talk about with you OK.
Feel free to discuss it.
Sincerely
Dyoni
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