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A tBLASTn search of the Myxococcus xanthus genome database at The Institute for Genomic Research (TIGR) identified three genes (pdeA, pdeB, and pdeC) that encode proteins homologous to 3',5'-cyclic nucleotide phosphodiesterase. pdeA, pdeB, and pdeC mutants, constructed by replacing a part of the gene with the kanamycin or tetracycline resistance gene, showed normal growth, development, and germination under nonstress conditions. However, the spores of mutants, especially the pdeA and pdeB mutants, placed under osmotic stress germinated earlier than the wild-type spores. The phenotype was the opposite of that of the receptor-type adenylyl cyclase (cyaA or cyaB) mutant. Also, pdeA and pdeB mutants were found to have impaired growth under the condition of high-temperature stress. Intracellular cyclic AMP (cAMP) levels of pdeA or pdeB mutant cells under these stressful conditions were about 1.3-fold to 2.0-fold higher than those of wild-type cells. These results suggest that PdeA and PdeB may be involved in osmotic adaptation during spore germination and temperature adaptation during vegetative growth through the regulation of cAMP levels.

journal of bacteriology

Contribution of the Cyclic Nucleotide Phosphodiesterases PdeA and PdeB to Adaptation of <i>Myxococcus xanthus</i> Cells to Osmotic or High-Temperature Stress

Contribution of the Cyclic Nucleotide Phosphodiesterases PdeA and PdeB to Adaptation of Myxococcus xanthus Cells to Osmotic or High-Temperature Stress