CBM-like is domain III of rhamnogalacturonan lyase (RG-lyase). The full-length protein specifically recognises and cleaves alpha-1,4 glycosidic bonds between l-rhamnose and d-galacturonic acids in the backbone of rhamnogalacturonan-I, a major component of the plant cell wall polysaccharide, pectin. This domain possesses a jelly roll beta-sandwich fold structurally homologous to carbohydrate binding modules (CBMs), and it carries two sulfate ions and a hexa-coordinated calcium ion.

1: Rhamnogalacturonan lyase reveals a unique three-domain modular structure for polysaccharide lyase family 4. McDonough MA, Kadirvelraj R, Harris P, Poulsen JC, Larsen S; FEBS Lett. 2004;565:188-194. PMID:15135077