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. Author manuscript; available in PMC: 2015 Jan 1.
Published in final edited form as: Mol Microbiol. 2013 Dec 4;91(2):275–299. doi: 10.1111/mmi.12459

Fig. 1.

Fig. 1

Schematic structure of pectin and the sites of action of pectinolytic enzymes. Pectin is a family of at least four different types of polysaccharides: homogalacturonan (HG), rhamnogalacturonan I (RG-I), xylogalacturonan (XG), and rhamnogalacturonan II (which is not shown here since it is not known to be a substrate for microbial degradation). The figure shows representative structures and is not to scale. HG and RG-I are generally much more abundant in plant cell walls than the other components. Please note that the enzyme classes indicated here are not necessarily found in all fungi.