 The high resolution crystal structure of the α-subunit of the glutaconyl-CoA decarboxylase (Gcdα) of "Acidaminococcus fermentans" (TC# 3.B.1.1.3) has been solved ().The active site of the dimeric enzyme lies at the interface between the two monomers.The N-terminal domain binds the glutaconyl-CoA, and the C-terminal domain binds the biotinyl lysine moiety.