9.B.259. The Uncharacterized Archaeal/Bacterial Protein-1 (UABP1) Family The UBP9 family consists mostly of proteins of about 200 - 250 aas with 6 TMSs, but several have more than 6 TMSs, and a few have less. They derive from uncultured and cultured bacteria as well as archaea. Those in subfamily 2 may be parts of histidine sensor kinases. In this respect, and with appreciable sequence similarity, they resemble some members of the family with TC# 9.B.238.2. These two families include the sensor domain of sensor kinases at their C-termini, and this domain comprises a superfamily not listed in TCDB because it is not related to transport.
Examples:
TC#	Name	Organismal Type	Example
9.B.259.1.1	Uncharacterized protein of 227 aas and 6 TMSs.		UP of Candidatus Saccharibacteria bacterium

9.B.259.1.2	Uncharacterized protein of 242 aas and 6 TMSs.		UP of Chlamydia trachomatis

9.B.259.1.3	Uncharacterized protein of 226 aas and 7 TMSs.		UP of Salinispira pacifica

9.B.259.1.4	Uncharacterized protein of 283 aas and 9 TMSs.		UP of Candidatus Pacearchaeota archaeon

9.B.259.1.5	Uncharacterized protein of 224 aas and 7 TMSs.		UP of Ignavibacteria bacterium

Examples:
TC#	Name	Organismal Type	Example
9.B.259.2.1	Uncharacterized PAS domain S-box proteinof 552 aas with 6 N-terminal TMSs and a C-terminal histidine sensor kinase homologous to those in family 9.B.238 with closest similarity to 9.B.238.2.2.		UP of Methanosalsum zhilinae

9.B.259.2.2	Uncharacterized protein of 233 aas and 7 N-terminal TMSs with a C-terminal sensor kinase domain homologous to those in families 9.B.238 and 2.A.21.		UP of Candidatus Vogelbacteria bacterium

9.B.259.2.3	Uncharacterized protein of 810 aas and 10 N-terminal TMSs, followed by a large hydrophilic domain of equal size.		UP of Candidatus Falkowbacteria bacterium (groundwater metagenome)