Among the different microorganisms,secondary metabolites (Berdy 2005). Among the presently known
microbial metabolites, 55% (∼10,000 compounds) were isolated
from various Actinomycetales (Table 1). Of these Actinomycetales
compounds, 75% were from Streptomyces and 25% were from rare
actinomycetes (Berdy 2005).
actinomycetes are undoubtedly the largest producers of