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The bsgA mutants of Myxococcus xanthus are blocked at a very early stage of the developmental program. They fail to produce fruiting bodies or to sporulate under normal conditions but can be rescued by extracellular complementation in mixtures with wild-type cells. A bsgA-lacZ gene fusion was constructed and expressed in Escherichia coli. The resulting fusion protein, which has beta-galactosidase enzyme activity, was partially purified by affinity chromatography and preparative polyacrylamide gel electrophoresis. The protein was used to immunize mice, which produced a hybridoma secreting monoclonal antibody that was specific for the bsgA gene product. The monoclonal antibody was used in Western blot (immunoblot) experiments to determine the apparent cellular location of the bsgA protein in M. xanthus and to compare the level of this protein at various times in the Myxococcus life cycle.

Identification and characterization of the Myxococcus xanthus bsgA gene product