TABLE 1.

Representative members of group A colicins^a

Colicin	Receptor	Translocation	Cytotoxic activity
A	BtuB	OmpF, TolQRAB	Pore formation
E1	BtuB	TolC, TolQRA	Pore formation
E2, E7, E8, E9	BtuB	OmpF, TolQRAB	DNase
E3, E4, E6	BtuB	OmpF, TolQRAB	RNase hydrolyzing 16S rRNA
E5	BtuB	OmpF, TolRAB	RNase hydrolyzing the anticodon loop of tRNA
N	OmpF	TolQRA	Pore formation
K	Tsx	OmpF, OmpA, TolQRAB	Pore formation
U, 28b	OmpA	OmpF, LPS, TolQRAB	Pore formation
DF13	IutA	TolQRA	RNase hydrolyzing 16S rRNA

^aBased on data in reference 366.