Initiation of aerial mycelium formation in Streptomyces.

In the past two years, the isolation of extracellular factors involved in the initiation of aerial mycelium formation, the identification of metabolic defects in certain developmental mutants, and the characterisation of three further bld genes and several gamma-butyrolactone receptor genes have led to new ideas about the mechanisms that initiate aerial mycelium formation in Streptomyces. The emerging picture suggests the integration of numerous signals from both inside and outside the cell.