STUDY ON BIOLOGICAL CHARACTERISTICS OF ACTINOMYCETE STRAIN CH9.4 ISOLATED FROM CROPLAND IN QUOC OAI DISTRICT, HANOI

Abstract

In the soil environment, Streptomyces often make up a major proportion of the total actinomycete population and are recognized as a rich source of useful bioactive compounds. Actinomycete strain CH9.4 was isolated from cropland in Quoc Oai district, Hanoi showed high biological activity as resistance to both Gram-negative and gram-positive bacteria, and good growth on a variety of culture media at different temperatures. Optimum growth of CH9.4 strain is 28OC, pH 7.5. Based on the biological characterization study and analysis of the 16S rDNA gene sequence, CH9.4 strain has a high similarity with Streptomyces cinnamonensis strain, hence the name S. cinnamonensis CH9.4. Analysis of the presence of functional genes involved in antibiotic biosynthesis showed that the strain S. cinnamonensis CH9.4 carried the gene encoding polyketide type 2. Thus, the strain S. cinnamonensis CH9.4 has a high potential for research. biosynthesis of antibiotics from microorganisms.