adenine specific DNA methyltransferase (dpnA) HP0050 Helicobacter pylori 26695 hypothetical HP0001 Helicobacter pylori 26695 GTP-binding membrane protein (lepA) HP0355 Helicobacter pylori 26695 bogus-binding membrane protein (lepA) HP0355 Helicobacter pylori 26695 Two hybrid test Two hybrid test Two hybrid test