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JD258, a Tn5 insertion mutant of Myxococcus xanthus, was shown to have major defects in three development-associated properties: expression of the developmentally regulated tps gene, spore formation, and production of multicellular fruiting bodies. The defects in tps gene expression and sporulation could be substantially corrected, at the phenotypic level, by mixing JD258 with wild-type cells (extracellular complementation). By this criterion, JD258 appeared to be a new member of a group of conditional developmental mutants that were previously characterized and placed in four extracellular complementation groups (A to D) based on the ability of mutants in one group to stimulate development in mutants belonging to a different group (D. C. Hagen, A. P. Bretscher, and D. Kaiser, Dev. Biol. 64:284-296, 1978). Mutants from groups A, B, C, and D all displayed extracellular complementation activity when mixed with JD258. These results, and other aspects of the phenotype of JD258, indicate that this mutant defines a fifth extracellular complementation group, group E. The M. xanthus esg locus identified by the Tn5 insertion in JD258 was cloned in Escherichia coli and used for further genetic analysis of the locus. These studies indicated that the esg locus resides within a 2.5-kb region of the M. xanthus chromosome and that the locus contains at least two genetic complementation groups. Our results are consistent with a model in which the esg locus controls the production of a previously unrecognized extracellular signal that must be transmitted between cells for the completion of M. xanthus development.

Identification of esg, a genetic locus involved in cell-cell signaling during Myxococcus xanthus development