Tripartite tricarboxylate transporter family receptor
These probable extra-cytoplasmic solute receptors are strongly overrepresented in several beta-proteobacteria. This family, formerly known as Bug - Bordetella uptake gene (bug) product - is a family of bacterial tripartite tricarboxylate receptors of the extracytoplasmic solute binding receptor-dependent transporter group of families, distinct from the ABC and TRAP-T families. The TctABC system has been characterized in S. typhimurium, and TctC is the extracytoplasmic tricarboxylate-binding receptor which binds the transporters TctA and TctB, two integral membrane proteins. Complete three-component systems are found only in bacteria.