TCDB is operated by the Saier Lab Bioinformatics Group

9.B.270.  The Uncharacterized Bacterial Protein-16 (UBP16) Family 

This family is large, and protein members within it are fairly large with 5 or 6 TMSs in a 2 + 3 or 3 + 3 TMS arrangement.  They contain a phage shock protein C (PspC) domain.