... protein NifA in combination with the alternativer54-RNA polymerase [3,4]. In the free-living Klebsiellapneumoniae, Azotobacter vinelandii and Azoarcus sp. B H72,NifA transcriptional a ctivity ... Molecular Clon-ing: a Laboratory Manual, 2nd edn. Cold Spring HarborLaboratory Press, New York. 36. Berger, D.K., Narberhaus, F. & Kustu, S. (1994) The isolatedcatalytic d omain of NIFA, a bacterial ... (5¢-CACACAGGAAACAGAATTCCCGGG-3¢, sense primer (NifLE-coRI); 5¢-CAATGTCCTGAAGCTTACATAAGGCTTCAC-3¢, antisense primer (NifAHindIII). The 3.1 kb PCRproduct was cloned into t he EcoRI and HindIII...