TABLE 1.

Sources, sequences, and activities of cyclic bacterial proteins

Peptide	Source	No. of amino acids	Sequence	Charge	Structure	Activity
Microcin J25	E. coli AY25	21	GGAGHVPEYFVGIGTPISFYG	−1	Compact fold containing β-strands	Antimicrobial (gram-negative, narrow spectrum)
Gassericin A (reutericin 6)	L. gasseri LA39, L. reuteri LA6	58	IYWIADQFGIHLATGTARKLLDAMASGASLGTAFAAILGVTLPAWALAAAGALGATAA	0	Helical (predicted)	Antimicrobial (gram-positive, broad spectrum)
Bacteriocin AS-48	E. faecalis	70	MAKEFGIPAAVAGTVLNVVEAGGWVTLTAVGSGGLSLLAAAGRESIKAYLKKEIKKKGKRAVTAW	+6	Helical	Antimicrobial (gram-positive, broad spectrum)
TrbC	E. coli	78	SEGTGGSLPYESWLTNLRNSVTGPVAFALSIIGIVVAGGVLIFGGELNAFFRTLIFLVLVMALLVGAQNVMSTFFGRG	0	Helical (predicted)	Conjugative pili
T pilin	A. tumefaciens	74	QSAGGGTDPATMVNNICTFILGPFGQSLAVLGIVAIGISWMFGRASLGLVAGVVGGIVIMFGASFLGKTLTGGG	+1	Helical (predicted)	Conjugative pili