Outer membrane protein transport protein (OMPP1/FadL/TodX)
This family includes TodX from Pseudomonas putida F1 and TbuX from Ralstonia pickettii PKO1. These are membrane proteins of uncertain function that are involved in toluene catabolism. Related proteins involved in the degradation of similar aromatic hydrocarbons are also in this family, such as CymD. This family also includes FadL involved in translocation of long-chain fatty acids across the outer membrane. It is also a receptor for the bacteriophage T2.