1.B.80 The Putative Trans-Outer Membrane Electron Flow Porin (TOM-EF) Family

Putative porins of 400 - 450 aas with an N-terminal hydrophobic leader sequence followed by about 20 β-strands, probably in a β-barrel, comprise this family.  They are constituents of functionally characterized transmembrane electron flow complexes, also including periplasmic and outer membrane cytochrome c homologues.  These complexes are presented in a family with TC#5.B.8.  See this TC family for a more detailed description (Liu et al. 2015). 

CDD recognizes these proteins as members of Porin Superfamily I (see superfamily hyperlink in TCDB).  It is not expected that all of these porins function in trans outer membrane electron flow, but this possibility has yet to be tested.