9.B.396. The Uncharacterized Prokaryotic Membrane Protein-2 (UPMP2) Family
UPMP2 family proteins vary in size and topology. Some are about 230 aas with 6 TMSs; others are larger (~1000 aas with 7 N-terminal TMSs and a large C-terminal hydrophilic domain, and others are about 740 aas with 12 or 13 TMSs. These last mentioned proteins have the first 6 TMSs that belong to family 9.B.396, and the last 7 TMSs are homologous to members of the MFS (2.A.1).