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UPA Perpustakaan Universitas Jember

Overexpression of a Domain of Unknown Function 231-containing protein increases O-xylan acetylation and cellulose biosynthesis in Populus

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Background: Domain of Unknown Function 231‑containing proteins (DUF231) are plant specifc and their function
is largely unknown. Studies in the model plants Arabidopsis and rice suggested that some DUF231 proteins act in the
process of O‑acetyl substitution of hemicellulose and esterifcation of pectin. However, little is known about the func‑
tion of DUF231 proteins in woody plant species.
Results: This study provides evidence supporting that one member of DUF231 family proteins in the woody peren‑
nial plant Populus deltoides (genotype WV94), PdDUF231A, has a role in the acetylation of xylan and afects cellulose
biosynthesis. A total of 52 DUF231‑containing proteins were identifed in the Populus genome. In P. deltoides trans‑
genic lines overexpressing PdDUF231A (OXPdDUF231A), glucose and cellulose contents were increased. Consistent
with these results, the transcript levels of cellulose biosynthesis‑related genes were increased in the OXPdDUF231A
transgenic lines. Furthermore, the relative content of total acetylated xylan was increased in the OXPdDUF231A
transgenic lines. Enzymatic saccharifcation assays revealed that the rate of glucose release increased in OXPdDUF231A
transgenic lines. Plant biomass productivity was also increased in OXPdDUF231A transgenic lines.
Conclusions: These results suggest that PdDUF231A afects cellulose biosynthesis and plays a role in the acetylation
of xylan. PdDUF231A is a promising target for genetic modifcation for biofuel production because biomass productiv‑
ity and compositional quality can be simultaneously improved through overexpression.

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