Fig. 1
From: Zonula occludens toxins and their prophages in Campylobacter species
Walker A and walker B motifs in Campylobacter Zot proteins. Campylobacter Zot proteins have a transmembrane domain (underlined). The amino acids prior to the transmembrane domains constitute the Zot family domains (approximately 1–210, shaded in grey) in different Campylobacter Zot. The Zot family domains belong to p-loop NTPase superfamily. Walker A and walker B motifs are in the N-terminus of Campylobacter Zot proteins. Walker A has a sequence of GxxxxGK[S/T], where x is any residue. Walker B motif has a sequence of hhhh[D/E], where h is a hydrophobic residue [25]