1.B.67 The Putative Beta Barrel Porin-4 (BBP4) Family The BBP4 family consists of proteins retrieved with a single BLAST search with a single iteration using query protein 1.B.67.1.1. These proteins show similarity with many proteins in TC subclass 1.B. In fact, this family is a member of the large beta barrel porin superfamily. Most of them have N-terminal leader sequences that probably target them to the Sec translocon for export across the cytoplasmic membrane. There seems to be no functionally characterized member of this family as of 8/2013.
This family belongs to the Outer Membrane Pore-forming Protein I (OMPP-I) Superfamily .
Examples:
TC#	Name	Organismal Type	Example
1.B.67.1.1	Putative porin	Ignavibacteria	Porin of Melloribacter roseus

1.B.67.1.2	Putative outer membrane channel superfamily member	Proteobacteria	*Putative porin of Rhodanobacter* sp.**

1.B.67.1.3	Putative porin	Thermodesulfobacteria	Putative porin of Thermodesulfobacterium geofontis

1.B.67.1.4	Putative porin	Proteobacteria	Putative porin of Melioribacter roseus

1.B.67.1.5	Putative porin	Ignavibacteriae	Putative porin of Ignavibacterium album

1.B.67.1.6	Putative porin	Proteobacteria	Putative porin of Anaeromyxobacter dehalogans

1.B.67.1.7	Putative holin	Aquificae	Putative porin of Sulfurihydrogenibium azorense