Abstract
This article comments on:Zhao X, Liu N, Shang N, et al. 2018. Three UDP-xylose transporters (UXTs) participate in xylan biosynthesis by conveying cytosolic UDP-xylose into the Golgi lumen in Arabidopsis. Journal of Experimental Botany 69, 1125–1134. .
Highlights
Plant science is approaching the vision of cell walls constructed ‘fit for purpose’ (Johnson et al, 2017)
This central carbohydrate precursor is converted to UDP-L-rhamnose, UDP-galactose and UDP-D-glucuronic acid (UDP-GlcA), the latter being converted to UDP-D-apiose and UDP-D-xylose (UDP-Xyl)
The first example is the biosynthesis of UDP-Xyl, a precursor for xylans (York and O’Neill, 2008), xyloglucan, rhamnogalacturonan II (RG II) and xylogalacturonan (Caffall and Mohnen, 2009)
Summary
Plant science is approaching the vision of cell walls constructed ‘fit for purpose’ (Johnson et al, 2017). The enzyme that generates UDP-D-galacturonic acid (GalA) from UDP-GlcA is exclusively Golgi localized. To give the cytosolic pool of UDP-Xyl access to the site of carbohydrate biosynthesis, a Golgi-localized UDP-Xyl transporter is needed.
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