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. 2009 Jun 9;284(32):21526–21535. doi: 10.1074/jbc.M109.014761

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© 2009 by The American Society for Biochemistry and Molecular Biology, Inc.

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FIGURE 6. — A model for GalA recycling during wall assembly and restructuring. GalA hydrolytically released from wall polymers during wall assembly and restructuring or from storage tissues is transferred to the cytosol by plasmamembrane sugar transporter(s). GalA is subsequently phosphorylated by GalAK (1, At3g10700) and then converted to UDP-GalA in the cytosol by Sloppy (2, a UDP-sugar PPase, At5g52560). UDP-GalA can then be transferred by a UDP-GalA transporter into the Golgi, where it can be directly incorporated by glycosyltransferases to glycans or enter the nucleotide-sugar interconversion pathway. UDP-GlcA 4-epimerase (3, e.g. At2g45310) interconverts UDP-GalA and UDP-GlcA. UDP-GlcA is converted to UDP-xylose by UDP-GlcA decarboxylase (4, Uxs, e.g. At3g53520). UDP-xylose 4-epimerase (5, Uxe, e.g. At1g30620) interconverts UDP-xylose and UDP-arabinose.