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Colonies of "Streptomyces coelicolor" A3(2) on Mueller-Hinton agar. Cultivation 14 days, 28°C. The bacterium produces antibiotic
actinorhodin (blue pigment colouring colonies and surrounding cultivation medium). Production of actinorhodin takes place when cultures of S. coelicolor A3(2)
enter the stationary phase. Colonies are covered with white aerial mycelium with spores.
The complete genome of "S. coelicolor" strain A3(2) was published in 2002. At the time, the S. coelicolor genome was thought to contain the largest number of genes of any bacterium.
The chromosome is 8,667,507 bp long (Escherichia coli 4,639,221 bp) with a GC-content of 72.1%. Taxonomically, "S. coelicolor" A3(2) belongs to the species of Streptomyces violaceoruber
and not a validly described separate species; "S. coelicolor" A3(2) is not to be mistaken for the actual Streptomyces coelicolor (Müller).
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