This is the C-terminal seven alpha helices of the structure whose full length represents the enzyme adenylosuccinate lyase. This sequence lies C-terminal to the conserved motif necessary for beta-elimination reactions [1], Adenylosuccinate lyase catalyses two steps in the synthesis of purine nucleotides: the conversion of succinylaminoimidazole-carboxamide ribotide into aminoimidazole-carboxamide ribotide, the eighth step of the de novo pathway, and the formation of adenosine monophosphate (AMP) from adenylosuccinate, the second step in the conversion of inosine monophosphate into AMP [2].

1: Characterisation of the gene encoding adenylosuccinate lyase of Plasmodium falciparum. Marshall VM, Coppel RL; Mol Biochem Parasitol. 1997;88:237-241. PMID:9274883

2: Adenylosuccinate lyase deficiency: The first identified polish patient. Jurkiewicz E, Mierzewska H, Kusmierska K; Brain Dev. 2007;29:600-602. PMID:17485188