HMM Summary Page: TIGR01782

FunctionTonB-dependent receptor
Trusted Cutoff310.00
Domain Trusted Cutoff310.00
Noise Cutoff123.00
Domain Noise Cutoff123.00
Isology Typesubfamily
HMM Length868
Mainrole CategoryTransport and binding proteins
Subrole CategoryPorins
Gene Ontology TermGO:0006810: transport biological_process
GO:0019867: outer membrane cellular_component
GO:0022857: transmembrane transporter activity molecular_function
AuthorSelengut J
Entry DateJan 2 2003 10:24AM
Last ModifiedFeb 14 2011 3:27PM
CommentThis model represents a family of TonB-dependent outer-membrane receptors which are found mainly in Xanthomonas and Caulobacter. These appear to represent the expansion of a paralogous family in that the 22 X. axonopodis (21 in X. campestris) and 18 C. crescentus sequences are more closely related to each other than any of the many TonB-dependent receptors found in other species. In fact, the Crescentus and Xanthomonas sequences are inseparable on a phylogenetic tree using a PAM-weighted neighbor-joining method, indicating that one of the two genuses may have acquired this set of receptors from the other. The mechanism by which this family is shared between Xanthomonas, a gamma proteobacterial plant pathogen and Caulobacter, an alpha proteobacterial aquatic organism is unclear.