The FAM124 domain belongs to the Vicinial Oxygen Chelatase (VOC) superfamily of proteins and is comprised of two tandem alpha/beta domains. Residue conservation suggests that it might be enzymatic. Certain FAM124 domains fused to the TRADD-N domain are predicted to have secondarily lost their enzymatic activity and might be involved in protein-protein interactions [1].

1: Bacterial death and TRADD-N domains help define novel apoptosis and immunity mechanisms shared by prokaryotes and metazoans. Kaur G, Iyer LM, Burroughs AM, Aravind L; Elife. 2021; [Epub ahead of print] PMID:34061031