An AC-type element mediates transactivation of secondary cell wall carbohydrate-active enzymes by PttMYB021, the Populus MYB46 orthologue
نویسندگان
چکیده
Background The transcription factor MYB46, together with its redundant paralog MYB83, regulates expression of secondary cell wall biosynthesis genes in Arabidopsis [reviewed in 1]. We isolated the Populus MYB46 ortholog, PtxtMYB021 from hybrid aspen (Populus tremula x tremuloides) [2]. Transiently expressed MYB021 transactivated gene promoters of Populus xylan-active enzymes GT43A, GT43B and Xyn10A. Analysis of conserved motifs within these promoters identified the sequence CCACCAAC, which is similar to the AC elements mediating transactivation by MYB transcription factors during lignin biosynthesis, and we showed that this motif is enriched in xylem-specific carbohydrate active enzyme (CAZyme) promoters.
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