This entry represents a C-terminal domain associated with prokaryotic alpha-amylases, which adopt a secondary structure consisting of an eight-stranded antiparallel beta-sheet containing a Greek key motif. Their exact function has not, as yet, been determined [1].

1: Differential regulation of a hyperthermophilic alpha-amylase with a novel (Ca,Zn) two-metal center by zinc. Linden A, Mayans O, Meyer-Klaucke W, Antranikian G, Wilmanns M; J Biol Chem. 2003;278:9875-9884. PMID:12482867