Öz
Actinobacteria with high bioactive compound production potential can produce antibiotics, antitumor agents, factors that promote plant growth and enzymes. Isolation studies from different extreme environments are carried out for the discovery of new bioactive compounds. In this study, isolation of actinobacteria from the sediment of the headwaters of the River Sakarya and screening of their different bioactive metabolites were firstly performed. Gram positive, Gram negative bacteria, yeast and fungi were used in antimicrobial activity assay. The ability to (N) fix nitrogen, to dissolve inorganic phosphate, to produce indole acetic acid (IAA), and caseinase activities of isolates were investigated. As a result of 16S rDNA analysis of 17 actinobacteria isolates, the isolates were defined as Micromonospora sp., (14) as Saccharomonospora sp. (2) and as Cellulomonas sp. (1). In the results obtained, it was revealed that Micromonospora isolates have effective activity against Gram positive, yeast and fungi. 7 of the isolates could produce IAA and 12 of them could fix N and while 2 of the isolates have caseinase activity. The results obtained demostrated that those with high activity in terms of antimicrobial properties will can good pharmaceutical candidates. Isolates that have the potential to stimulate plant growth are also thought to have the potential to be used as biofertilizers in agriculture. In addition, as a result of 16S rDNA sequence analysis, it is possible that 2 Micromonospora sp., Saccharomonospora sp. and Cellulomonas sp. strains are new species.