[No authors listed]
Cellulose Synthase Like (CSL) proteins are a group of plant glycosyltransferases that are predicted to synthesize β-1,4-linked polysaccharide backbones. CSLC, CSLF and CSLH families have been confirmed to synthesize xyloglucan and mixed linkage β-glucan, while CSLA family proteins have been shown to synthesize mannans. The polysaccharide products of the five remaining CSL families have not been determined. Five CSLD genes have been identified in Arabidopsis thaliana and a role in cell wall biosynthesis has been demonstrated by reverse genetics. We have extended past research by producing a series of double and triple Arabidopsis mutants and gathered evidence that CSLD2, CSLD3 and CSLD5 are involved in mannan synthesis and that their products are necessary for the transition between early developmental stages in Arabidopsis. Moreover, our data revealed a complex interaction between the three glycosyltransferases and brought new evidence regarding the formation of non-cellulosic polysaccharides through multimeric complexes.
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