TCDB is operated by the Saier Lab Bioinformatics Group

9.B.255.  The Uncharacterized Protein from Unculturable Bacteria-7 (UPUB7) Family 

These proteins are only from uncultureable bacteria.  They have variable sizes (200 - 360 aas) and numbers of TMSs (4 - 8). It is possible, but not demonstrated, that these proteins are distantly related to the DMT superfamily (TC# 2.A.7).