IRX9 cDNA ORF clone, Arabidopsis thaliana(thale cress)

Sequence and analysis of chromosome 2 of the plant Arabidopsis thaliana.
Lin X, Kaul S, Rounsley S, Shea TP, Benito MI, Town CD, Fujii CY, Mason T, Bowman CL, Barnstead M, Feldblyum TV, Buell CR, Ketchum KA, Lee J, Ronning CM, Koo HL, Moffat KS, Cronin LA, Shen M, Pai G, Van Aken S, Umayam L, Tallon LJ, Gill JE, Adams MD, Carrera AJ, Creasy TH, Goodman HM, Somerville CR, Copenhaver GP, Preuss D, Nierman WC, White O, Eisen JA, Salzberg SL, Fraser CM, Venter JC
Nature402(6763)761-8(1999 Dec)

The putative glycosyltransferases IRX9, IRX14, and IRX10 (or the paralogs IRX9L, IRX14L, and IRX10L) are required for xylan backbone synthesis in Arabidopsis.
Title: Site-directed mutagenesis of IRX9, IRX9L and IRX14 proteins involved in xylan biosynthesis: glycosyltransferase activity is not required for IRX9 function in Arabidopsis.

The enzymatic activities of two Arabidopsis thaliana GT43 members, IRX9 (Irregular Xylem9) and IRX14, were investigated.
Title: Arabidopsis family GT43 members are xylan xylosyltransferases required for the elongation of the xylan backbone.

Double mutations of IRX9 and IRX14 were shown to cause a loss of secondary wall thickening in fibers and a much more severe reduction in glucuronoxylan synthesis.
Title: The Arabidopsis family GT43 glycosyltransferases form two functionally nonredundant groups essential for the elongation of glucuronoxylan backbone.

Results suggest that IRREGULAR XYLEM9 (IRX9) is required for normal glucuronoxylan (GX)elongation and indicate roles for IRX8 and FRA8 in the synthesis of the glycosyl sequence at the GX reducing end.
Title: Arabidopsis irregular xylem8 and irregular xylem9: implications for the complexity of glucuronoxylan biosynthesis.