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