The TerD domain is found in TerD family proteins that include the paralogous TerD, TerA, TerE, TerF and TerZ proteins [1,2] It is found in a stress response operon with TerB and TerC. TerD has a maximum of two calcium-binding sites [2] depending on the conservation of aspartates [2]. It has various fusions to nuclease domains, RNA binding domains, ubiquitin related domains, and metal binding domains. The ter gene products lie at the centre of membrane-linked metal recognition complexes with regulatory ramifications encompassing phosphorylation-dependent signal transduction, RNA-dependent regulation, biosynthesis of nucleoside-like metabolites and DNA processing linked to novel pathways [2].

1: Bacterial tellurite resistance. Taylor DE; Trends Microbiol 1999;7:111-115. PMID:10203839

2: Ter-dependent stress response systems: novel pathways related to metal sensing, production of a nucleoside-like metabolite, and DNA-processing. Anantharaman V, Iyer LM, Aravind L; Mol Biosyst. 2012;8:3142-3165. PMID:23044854