... 2. Expression of galA was onlydetected in the presence of sugar beet pectin, whereasexpression of lacA was detected in the presence ofL-arabi-nose,D-xylose, sugar beet pectin and xylan ... Theseenzymes have a retaining mechanism and for the Pseudo-monas fluorescens b- 1,4-endogalactanase the catalytic resi-dues have been determined [11]. Recently, the Aspergillusaculeatus b- 1,4-endogalactanase ... b- 1,4-endogalactanase have been clonedfrom both bacteria and fungi [11–15]. Based on their derivedamino acid sequence, the corresponding enzymes have beenassigned to family 53 of the glycosyl hydrolases [16]....