Structure and functionality of Rhamnogalacturonan I in the cell wall and in solution: A review

Carbohydr Polym. 2022 Feb 15;278:118909. doi: 10.1016/j.carbpol.2021.118909. Epub 2021 Nov 18.


Rhamnogalacturonan I (RG-I) belongs to the pectin family and is found in many plant cell wall types at different growth stages. It plays a significant role in cell wall and plant biomechanics and shows a gelling ability in solution. However, it has a significantly more complicated structure than smooth homogalacturonan (HG) and its variability due to plant source and physiological state contributes to the fact that RG-I's structure and function is still not so well known. Since functionality is a product of structure, we present a comprehensive review concerning the chemical structure and conformation of RG-I, its functions in plants and properties in solutions.

Keywords: Pectin; Rhamnogalacturonan I; Rhamnose; Structural characteristics.

Publication types

  • Review

MeSH terms

  • Carbohydrate Conformation
  • Cell Wall / chemistry*
  • Cell Wall / metabolism
  • Pectins / chemistry
  • Pectins / metabolism*
  • Plants / chemistry*
  • Plants / metabolism
  • Solutions


  • Solutions
  • rhamnogalacturonan I
  • Pectins