... the lack of domain B protruding out of the TIM barrel in the place of loop 3 connecting the b3-strand to the a3-helix [9,21]. Sharing domain B by rBATs andGH13 enzymes, and especially the sequence of ... [3,11–13]. Of the three GHfamilies of the clan GH-H, it was the family GH13that was originally established as the a-amylase family[14–17]. At present it belongs to the largest families in the entire ... hcHATs, the regions of similarity cover the sequence segments within the C-terminal extracellulardomain. The segments correspond, in fact, with some of the a-amylase family CSRs, namely the b-strandsb2,...