This model largely duplicates TIGR03901, but differs somewhat in coverage. The domain described here, now called MYXO-CTERM, is small (about 30 amino acids), hydrophobic, only moderately conserved, and similar to numerous other transmembrane helix-containing sequence regions from convergent evolution. The trusted cutoff for the HMM therefore must be set fairly high. This domain is found, once per protein but in many proteins per genome in several bacteria of the order Myxococcales. It begins with a signature Gly-Cys motif. Its other features, including a hydrophobic transmembrane helix, Arg-rich cluster, and location at the protein C-terminus, resemble the PEP-CTERM proposed protein targeting domain. MYXO-CTERM domains occur in species with the processing endopeptidase myxosortase. It is likely that lipid is attached to the Cys side chain prior to a cleavage of the sorting domain distal to the GC site.
GO Terms:- Cellular Component:
- external side of cell outer membrane (GO:0031240)
- Date:
- 2024-11-26