Table 1. Cationic antimicrobial peptides (Modified with permission  from Vizioli and Salzet, 2002).

Structure and representative Peptides	Organism	Antimicrobial activity	References
Linear α-helix peptides Cecropins	Insects, pig	Bacteria, fungi, virus,	Andreu and Rivas, 1998; Putsep et al. 1999; Zasloff, 2002; Vizioli and Salzet, 2003
Clavanin, styelin	Tunicates	Bacteria	Zasloff, 2002
Megainin, dermaseptin	Amphibians	Bacteria, protozoa	Zasloff, 2002, Vizioli and Salzet, 2003
Buforins	Amphibians	Bacteria, fungi	Park et al. 1996, 1998; Zasloff, 2002
Pleurocidin	Fish	Bacteria, fungi	Cole et al. 2000
Moronecidin	Fish	Bacteria	Lauth et al. 2002
Linear peptides amino acid-rich
Pro-rich:
Drosocin, metchnikowins	Fruit fly	Bacteria	Bulet et al. 1999
Pyrrhocoricin	Hemipteran	Bacteria, fungi	Bulet et al. 1999
metalnikowin	Hemipteran	Bacteria, fungi	Bulet et al. 1999
Gly-rich:
Diptericins, attacins	Dipterans	Bacteria	Bulet et al. 1999
shepherin I and shepherin II	Plants	Bacteria G-  , fungi	Park et al. 2000
Ac-AMP1- Ac-AMP2	Plants	Bacteria G+, fungi	Broekaert et al. 1992
His-rich
Histatin	Human	Bacteria, fungi	Andreu and Rivas, 1998; Zasloff, 2002
shepherin I and shepherin II	Plants	Bacteria G-  , fungi	Park et al. 2000
Try-rich
Indolicidin	Cattle	Bacteria	Andreu and Rivas, 1998; Zasloff, 2002
Tritrpticin, lactoferrin B, LfcinB4-9	Eukaryots	Bacteria	Schibli et al. 2002
Single disulfide bridge
Thanatin	Hemipteran	Bacteria, fungi	Dimarcq et al. 1998; Bulet et al. 1999; Zasloff, 2002
Brevinins	Frog	Bacteria	Andreu and Rivas, 1998; Zasloff, 2002
Lanthionins	Bacteria G+	Bacteria	Hancock, 2000
Two disulfide bridges
Tachyplesin II	Horseshoe crab	Bacteria, fungi, virus	Andreu and Rivas, 1998, Dimarq et al. 1998; Zasloff, 2002
Androctonin	Scorpion	Bacteria, fungi	Dimarq et al. 1998; Zasloff, 2002
Protegrin I	Pig	Bacteria, fungi, virus	Zasloff, 2002
Three disulfide bridges
α Defensins	Mammals	Bacteria, fungi	Andreu and Rivas, 1998; Zasloff, 2002
β Defensins	Mammals	Bacteria, fungi	Andreu and Rivas, 1998; Zasloff, 2002
Defensis	Insects	Bacteria, fungi, protozoa	Dimarq et al. 1998; Bulet et al. 1999; Vizioli and Salzet, 2003
Penaeidins	Shrimp	Bacteria, fungi	Dimarq et al. 1998; Bulet et al. 1999; Vizioli and Salzet, 2003
More than three disulfide bridges
Tachycitin	Horseshoe crab	Bacteria, fungi	Dimarq et al. 1998
Drosomycin	Fruit fly	Fungi	Dimarq et al. 1998
Gambicin	Mosquito	Bacteria, fungi, protozoa	Vizioli et al. 2001
Heliomicin	Lepidopteran	Bacteria, fungi	Lamberty et al. 2001
Plant defensins
defensin protein WT1	Plants	Fungi	Saitoh et al. 2001
alfAFP defensin	Plants	Fungi	Gao et al. 2000
cysteine-rich	Plants	Bacteria , fungi	Tailor et al. 1997
So-D1-7	Plants	Bacteria ,fungi	Segura et al.. 1998
DmAMP1	Plants	Fungi	Thevissen et al. 2000