Genome Sequence of the Bacterium Streptomyces davawensis JCM 4913 and Heterologous Production of the Unique Antibiotic Roseoflavin

Streptomyces davawensis JCM 4913 synthesizes the antibiotic roseoflavin, a structural riboflavin (vitamin B2 ) analog. Here, we report the 9,466,619-bp linear chromosome ofS. davawensis JCM 4913 and a 89,331-bp linear plasmid. The sequence has an average G+C content of 70.58% and contains six rRNA operons (16S-23S-5S) and 69 tRNA genes. The 8,616 predicted protein-coding sequences include 32 clusters coding for secondary metabolites, several of which are unique toS. davawensis . The chromosome contains long terminal inverted repeats of 33,255 bp each and atypical telomeres. Sequence analysis with regard to riboflavin biosynthesis revealed three different patterns of gene organization inStreptomyces species. Heterologous expression of a set of genes present on a subgenomic fragment ofS. davawensis resulted in the production of roseoflavin by the hostStreptomyces coelicolor M1152. Phylogenetic analysis revealed thatS. davawensis is a close relative ofStreptomyces cinnabarinus , and much to our surprise, we found that the latter bacterium is a roseoflavin producer as well.