TCDB is operated by the Saier Lab Bioinformatics Group
TCIDNameDomainKingdom/PhylumProtein(s)
1.B.18.1.1









OMA protein component of a PST-type exopolysaccharide export system (outer membrane porin constituent)
Bacteria
Proteobacteria
ExoF of Rhizobium meliloti
1.B.18.1.2









OMA protein component of an ABC-type group 2 capsular polysaccharide (polysialic acid) export system (outer membrane porin constituent)
Bacteria
Proteobacteria
KpsD of E. coli
1.B.18.2.1









OMA protein component of an ABC-type Vi polysaccharide antigen export system, VexA (functions with VexBCD, 3.A.1.101.2) (Hashimoto et al., 1993)
Bacteria
Proteobacteria
VexA of Salmonella typhi (Q04976)
1.B.18.2.2









OMA component of exopolysaccharide exporter, PssN (outer membrane lipoprotein, oriented toward the periplasm; predominantly of β-structure, but with some α-structure) (Marczak et al., 2006).
Bacteria
Proteobacteria
PssN of Rhizobium leguminosarum (Q27SU9)
1.B.18.2.3









Capsular polysialate exporter component, CtrA. OMA of 3.A.1.101.3 (functions with 3.A.1.101.3 (ABC) and 8.B.4.2.1 (MPA2)) (Larue et al., 2011)

Bacteria
Proteobacteria
CtrA of Neisseria meningitidis (Q547A8)
1.B.18.2.4









The OMA capsular polysaccharide exporter of 394 aas, BexD (Kroll et al. 1990).

Bacteria
Proteobacteria
BexD of Haemophilus influenzae
1.B.18.3.1









OMA component of the group 1 K30 capsular polysaccharide, colanic acid, export system, Wza (Reid and Whitfield, 2005) (outer membrane porin constituent). The 3-d structure of the Wza/Wzc complex has been solved by Collins et al. (2007). It spans the periplasm, comprising a central constituent for complex formation. The x-ray structure shows an integral outer membrane transmembrane α-helical barrel with a large central cavity, similar to the secretin protein, PilQ (1.B.22.2.1) (Collins and Derrick, 2007).  Wza is an octameric α-helical outer membrane channel that directly exports nascent capsular polysaccharide chains through the Wza portal (Nickerson et al. 2014). Peptides based on the C-terminal D4 domain of Wza form transmembrane, ion conducting α-helical barrels. The helix barrel contains eight D4 peptides arranged in parallel (Mahendran et al. 2017).

Bacteria
Proteobacteria
Wza of E. coli (P0A930)
1.B.18.3.2









The OMA protein component of a PST-type exopolysaccharide exporter (EpsE; TC# 2.A.66.2.11) (Huang and Schell, 1995)
Bacteria
Proteobacteria
EpsA of Ralstonia solanacearum (Q45407)
1.B.18.3.3









The Wza protein, an OMA homologue.  May functions with an α-glycosyl transferase, RemC (A5FNG2) which shows limited sequence similarity to the cytoplasmic domain of 2.A.38.4.5, and the Wzc tyrosine protein kinase (8.A.3.3.4) (Shrivastava et al. 2012).

Bacteria
Bacteroidetes/Chlorobi group
Wza of Flavobactrerium johnsoniae
1.B.18.3.4









Outer membrane polysaccharide-specific porin, Wza of 348 aas.

Bacteria
Chlamydiae/Verrucomicrobia group
Wza of Parachlamydia acanthamoebae
1.B.18.3.5









Polysaccharide transmembrane transporter of 741 aas.

Bacteria
Cyanobacteria
PS exporter of Oscillatoria acuminata
1.B.18.3.6









Polysaccharide exporter of 680 aas

Bacteria
Planctomycetes
PS exporter of Rhodopirellula sallentina
1.B.18.3.7









The outer membrane exo-polysaccharide (xanthan) exporter, GumB of 286 aas (Bianco et al. 2014).

Bacteria
Proteobacteria
GumB of Xanthomonas campestris
1.B.18.3.8









Outer membrane auxillary lipoprotein of 698 aas and 1 N-terminal TMS, GlfD or YmcA.  Probably involved in capsular polysaccharide export (Peleg et al. 2005; Cuthbertson et al. 2009; Nadler et al. 2012).

Bacteria
Proteobacteria
GlfD of E. coli