[SP]_[PF07660]_[PF13715]_[PF07715]_[PF00593]_[TM]

    [SP]_[46:PF07660]_[107:PF13715]_[196:PF07715]_[510:PF00593]_[TM]

    [SP]_[46:IPR011662]_[46:IPR011662]_[106:IPR008969]_[196:IPR012910]_[510:IPR000531]_[TM]
    

Looking for similar signatures in the working genomes

PF07660:STN. Secretin and TonB N terminus short domain

PF13715:CarbopepD_reg_2. CarboxypepD_reg-like domain

PF07715:Plug. TonB-dependent Receptor Plug Domain

PF00593:TonB_dep_Rec_b-barrel. TonB dependent receptor-like, beta-barrel