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. 2010 Jun;153(2):396-402.
doi: 10.1104/pp.110.154237. Epub 2010 Apr 7.

Xylan biosynthesis: news from the grass

Ahmed Faik  1
Affiliations

Xylan biosynthesis: news from the grass

Ahmed Faik. Plant Physiol. 2010 Jun.
No abstract available

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Figures

Figure 1.
Figure 1.
Structural features of the main side chains found in xylans from grasses. The asterisks indicate the position of the attachment of feruloyl groups on the α-(1,3)-linked Araf residues. Ac, O-acetyl groups; Me, O-methyl groups.
Figure 2.
Figure 2.
Proposed structures of the repeating unit in the newly synthesized GAX polymer and the oligosaccharides generated by digestion with a purified endoxylanase III from Aspergillus niger (GH11 family). These structures do not take into account the GlcUA residues, as their positions on the xylan backbone are not known. To cleave the xylan backbone, the endoxylanase III requires at least three adjacent and unsubstituted Xyl residues between substituted ones (Davies et al., 1997). The sequence of degradation reactions steps by the endoxylanase is proposed to explain the formation of the final oligosaccharides and monosaccharides detected by high-pH anion-exchange chromatography separation (Zeng et al., 2008). Araf, Arabinofuranose residues; Xylp, xylopyranose residues.
Figure 3.
Figure 3.
Phylogenetic trees reflecting the relationships between rice and Arabidopsis proteins from the GT43 (A) and GT47 (B) families. IRX7, IRX10, IRX10-L, and IRX14 along with XGD1 (At5g33290; a xylogalacturonan xylosyltransferase), ARAD1 (At2g35100; a putative arabinosyltransferase), and MUR3 (At2g20370; a xyloglucan galactosyltransferase) proteins were included in the analysis. The IRX proteins are known to be involved in GX biosynthesis during secondary cell wall deposition in Arabidopsis (York and O'Neill, 2008; Brown et al., 2009; Wu et al., 2009). Trees were constructed under the maximum-likelihood principle using the PhyML program (Guindon et al., 2005).
See this image and copyright information in PMC

References

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