Nucleic acid encoding helicobacter pylori enolase

Abstract

An isolated nucleic acid encoding the Helicobacter pylori recombinase is provided. Also provided is an isolated nucleic acid that hybridizes with the recombinase-encoding nucleic acid under stringent conditions and has at least 70% complementarity with the segment of the nucleic acid of SEQ ID NO:1 to which it hybridizes. Also provided is a mutant strain of H. pylori that does not express a functional recombinase (recA.sup.- mutant). An isolated nucleic acid encoding the Helicobacter pylori enolase is provided. Also provided is an isolated nucleic acid that hybridizes with the nucleic acid that encodes a H. pylori recombinase under stringent conditions and has at least 70% complementarity with the segment of the nucleic acid of SEQ ID NO:9 to which it hybridizes. Also provided is a mutant strain of H. pylori that does not express a functional enolase (eno.sup.- mutant). A method is provided for immunizing a subject against infection by H. pylori by administering to the subject an immunogenic amount of mutant H. pylori in a carrier for the mutant.

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