... Voragen2,Willem M. de Vos1 and John van der Oost11 Laboratory of Microbiology, Wageningen University, the Netherlands2 Laboratory of Food Chemistry, Wageningen University, the NetherlandsPectin is a ... homogalac-turonan, interspersed with rhamnogalacturonan units,which often contain sugar side chains composed of arabinan and galactan [1].Degradation of the pectin polymer occurs via a set of pectinolytic ... aspartate residues (Asp239 and Asp260, PelBnumbering), as well as the residues Asp261 and His296, believed to be of importance in the catalyticprocess, and Arg327 and Lys329, which may play...