Ontology Term : Pfam:PF14464 Prokaryotic homologs of the JAB domain EMBL-EBI

Description  These are metalloenzymes that function as the ubiquitin isopeptidase/ deubiquitinase in the ubiquitin-based signaling and protein turnover pathways in eukaryotes [1]. Prokaryotic JAB domains are predicted to have a similar role in their cognates of the ubiquitin modification pathway [2]. The domain is widely found in bacteria, archaea and phages where they are present in several gene contexts in addition to those that correspond to the prokaryotic cognates of the eukaryotic Ub pathway. Other contexts in which JAB domains are present include gene neighbor associations with ubiquitin fold domains in cysteine and siderophore biosynthesis, and phage tail morphogenesis, where they are shown or predicted to process the associated ubiquitin [2,3]. A distinct family, the RadC-like JAB domains are widespread in bacteria and are predicted to function as nucleases [4]. In halophilic archaea the JAB domain shows strong gene-neighborhood associations with a nucleotidyltransferase suggesting a role in nucleotide metabolism [4].
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