Shows weak antimicrobial activity against its phylogenetic relative Caulobacter crescentus. Does not show activity against other bacteria tested (E.coli, Vibrio sp, Burkhoderia thailandensis, and Salmonella newport). Highly thermostable. Intracellular, when expressed in E.coli. The gene cluster lacks the ABC transporter usually responsible for export of the mature peptide (Probable). May be secreted in vivo (Probable). Is composed of a ring composed by 9 residues, a 5 residue-loop (SVSGQ) and a C-terminal tail (PubMed:26534965). The peptide is threaded when the C-terminal tail is inserted throught the isopeptide-bonded ring. The loop region serves as a recognition element for the isopeptidase AtxE2 (Probable) (PubMed:27998080). This lasso peptide is hydrolyzed to a linear form by the isopeptidase AtxE2, in vitro. The isopeptidase AtxE2 only recognizes the threaded form (but not the unthreaded form).