Identification of a novel group of putative Arabidopsis thaliana beta-(1,3)-galactosyltransferases

Qu, YM; Egelund, J; Gilson, PR; Houghton, F; Gleeson, PA; Schultz, CJ; Bacic, A

Author(s): Qu, YM; Egelund, J; Gilson, PR; Houghton, F; Gleeson, PA; Schultz, CJ; Bacic, A;
Details: Publication Year 2008-09,Volume 68,Issue #1-2,Page 43-59
Journal Title: PLANT MOLECULAR BIOLOGY
Publication Type: Journal Article
Abstract: To begin biochemical and molecular studies on the biosynthesis of the type II arabinogalactan chains on arabinogalactan-proteins (AGPs), we adopted a bioinformatic approach to identify and systematically characterise the putative galactosyltransferases (GalTs) responsible for synthesizing the beta-(1,3)-Gal linkage from CAZy GT-family-31 from Arabidopsis thaliana. These analyses confirmed that 20 members of the GT-31 family contained domains/motifs typical of biochemically characterised beta-(1,3)-GTs from mammalian systems. Microarray data confirm that members of this family are expressed throughout all tissues making them likely candidates for the assembly of the ubiquitously found AGPs. One member, At1g77810, was selected for further analysis including location studies that confirmed its presence in the Golgi and preliminary enzyme substrate specificity studies that demonstrated beta-(1,3)-GalT activity. This bioinformatic/molecular study of CAZy GT-family-31 was validated by the recent report of Strasser et al. (Plant Cell 19:2278-2292, 2007) that another member of this family (At1g26810; GALT1) encodes a beta-(1,3)-GalT involved in the biosynthesis of the Lewis a epitope of N-glycans in Arabidopsis thaliana.
Publisher: SPRINGER
Keywords: MULTIPLE SEQUENCE ALIGNMENT; RYEGRASS ENDOSPERM CELLS; GUM-ARABIC GLYCOPROTEIN; AMINO-ACID-SEQUENCE; ARABINOGALACTAN-PROTEINS; LOLIUM-MULTIFLORUM; UDP-GALACTOSE; BETA-1,3-GALACTOSYLTRANSFERASE FAMILY; MOLECULAR CHARACTERIZATION; RHAMNOGALACTURONAN-I
Publisher's Version: https://doi.org/10.1007/s11103-008-9351-3
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Creation Date: 2008-09-01 12:00:00