Identifying a native p-hydroxybenzoyl-CoA monolignol transferase gene in poplar

MacKay, Heather A.

doi:10.14288/1.0380258

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“…In the particular case of oil palm empty fruit bunch (EFB), 40% of all S-units were p -hydroxybenzoylated, while less than 5% of all G-units were p -hydroxybenzoylated . The occurrence of highly p -hydroxybenzoylated lignin is not only structurally relevant but also has important implications in terms of lignin biosynthesis because it means that the p -hydroxybenzoyl-CoA monolignol transferase involved in their biosynthesis presents high affinities for both coniferyl and sinapyl alcohols. , No traces of ferulate-monolignol conjugates were found among the DFRC products, indicating that the ferulate moieties detected upon Py/TMAH are not from ferulates attached to the γ–OH as observed in other plants but from ferulates involved in lignin carbohydrate bridges and intrinsically incorporated into the lignin structure.…”

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confidence: 99%

Deciphering the Unique Structure and Acylation Pattern of Posidonia oceanica Lignin

Rencoret

Marques

Serrano

et al. 2020

ACS Sustainable Chem. Eng.

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Lignins from different parts of the seagrass Posidonia oceanicanamely sheaths, rhizome, and rootsas well as from fibrous balls from P. oceanica detritus were isolated and thoroughly characterized by pyrolysis coupled with gas chromatography/mass spectrometry, derivatization followed by reductive cleavage, two-dimensional nuclear magnetic resonance spectroscopy, and gel permeation chromatography. The lignins of P. oceanica were enriched in guaiacyl (G) over syringyl (S) units, with S/G ratios ranging from 0.1 (fibrous balls) to 0.5 (rhizome). β–O–4′ ethers and phenylcoumarans were the most abundant lignin substructures, followed by resinols, and minor amounts of dibenzodioxocins and spirodienones. Moreover, all lignins were found to be highly γ-acylated (up to 44% of total units), mainly with p-hydroxybenzoates but also, to a lesser extent, with acetates. The data indicated that this acylation extensively occurred in both G- and S-lignin units, contrary to what happens in palms, poplar, and willow, where p-hydroxybenzoates overwhelmingly appear at the γ-position of S-units.

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