A small family of bacterial proteins, found in several Bacteroides species. Structure determination (NMR and Xray) shows an immunoglobulin beta-barrel fold. Multiple homologues have been found in human gut metagenomics data sets. Structural experimentation shows it to share features with two well-established protein architectures in the SCOP database, ie, C2 (calcium/lipid-binding domain) of the Pfam PF00168 and PLAT/LH2 (lipase/lipooxigenase domain) of the Pfam PF01477. The C2 and PLAT/LH2 domains bind Ca2+ in their functions of targeting proteins to cell-membranes; this domain is also shown to bind Ca2+ as well as to be a novel fold [1].

1: Structural representative of the protein family PF14466 has a new fold and establishes links with the C2 and PLAT domains from the widely distant Pfams PF00168 and PF01477. Serrano P, Geralt M, Mohanty B, Wuthrich K; Protein Sci. 2013;22:1000-1007. PMID:23681886