This subgroup contains Escherichia coli aspartase (L-aspartate ammonia-lyase), Bacillus aspartase and related proteins. It is a member of the Lyase class I family, which includes both aspartase (L-aspartate ammonia-lyase) and fumarase class II enzymes. Members of this family for the most part catalyze similar beta-elimination reactions in which a C-N or C-O bond is cleaved with the release of fumarate as one of the products. These proteins are active as tetramers. The four active sites of the homotetrameric enzyme are each formed by residues from three different subunits. Aspartase catalyzes the reversible deamination of aspartic acid.
Jiyao W et al.(2023). "The conserved domain database in 2023.",