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. 2006 Jul;188(13):4787–4800. doi: 10.1128/JB.00066-06

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Copyright © 2006, American Society for Microbiology

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FIG. 5. — Interaction of H. pylori CagY/7 (VirB10 homologue) with H. pylori CagX/8 (VirB9 homologue). (A) Alignment of the full-length H. pylori CagY protein with A. tumefaciens VirB10. Three CagY/7 fragments [CagY/7(A), CagY/7(B), and CagY/7(C)] were expressed in the yeast two-hybrid system, as shown. The C-terminal region of CagY/7 [CagY/7(C)] is homologous to VirB10 from A. tumefaciens. (B) Yeast cells were cotransformed with the plasmids encoding the indicated fusion proteins and plated as described in the Fig. 4 legend. Yeast cotransformed with plasmids encoding GAL4BD-CagY/7(C) (the C terminus of CagY/7, which is homologous to VirB10) and GAL4AD-CagX/8 (a VirB9 homologue) grew on SD medium lacking tryptophan, leucine, and histidine, indicating an interaction between the two proteins encoded by these genes.