Diversity of Pectin Rhamnogalacturonan I Rhamnosyltransferases in Glycosyltransferase Family 106

Bussarin Wachananawat, Takeshi Kuroha, Yuto Takenaka, Hiroyuki Kajiura, Satoshi Naramoto, Ryusuke Yokoyama, Kimitsune Ishizaki, Kazuhiko Nishitani, Takeshi Ishimizu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Rhamnogalacturonan I (RG-I) comprises approximately one quarter of the pectin molecules in land plants, and the backbone of RG-I consists of a repeating sequence of [2)-α-L-Rha(1-4)-α-D-GalUA(1-] disaccharide. Four Arabidopsis thaliana genes encoding RG-I rhamnosyltransferases (AtRRT1 to AtRRT4), which synthesize the disaccharide repeats, have been identified in the glycosyltransferase family (GT106). However, the functional role of RG-I in plant cell walls and the evolutional history of RRTs remains to be clarified. Here, we characterized the sole ortholog of AtRRT1–AtRRT4 in liverwort, Marchantia polymorpha, namely, MpRRT1. MpRRT1 had RRT activity and genetically complemented the AtRRT1-deficient mutant phenotype in A. thaliana. However, the MpRRT1-deficient M. polymorpha mutants showed no prominent morphological changes and only an approximate 20% reduction in rhamnose content in the cell wall fraction compared to that in wild-type plants, suggesting the existence of other RRT gene(s) in the M. polymorpha genome. As expected, we detected RRT activities in other GT106 family proteins such as those encoded by MpRRT3 in M. polymorpha and FRB1/AtRRT8 in A. thaliana, the deficient mutant of which affects cell adhesion. Our results show that RRT genes are more redundant and diverse in GT106 than previously thought.

Original languageEnglish
Article number997
JournalFrontiers in Plant Science
Publication statusPublished - 2020 Jul 2
Externally publishedYes


  • GT106
  • Marchantia polymorpha
  • glycosyltransferase
  • pectin
  • rhamnogalacturonan I
  • rhamnosyltransferase

ASJC Scopus subject areas

  • Plant Science


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