Synthesis and Determination of Antimicrobial Efficacies of Secondary Metabolite of Streptomyces longisporoflavus and its 3D-Protein Structural Prediction

Aims: The need for new drug molecules is of high significance considering the rate at which pathogenic bacteria evolve into drug-resistant pathogens. Actinomycetes have been reported as valuable biological agents that possess potent bioactive molecules. This work aims to isolate local strains of actinomycetes in the environment and determine their antimicrobial activities against some clinical isolates.

Study Design: This was an in-vitro study.

Place and Duration of Study: The research was carried out at the Microbial Resources Research Laboratory, Department of Pure and Applied Biology, Ladoke Akintola University of Technology Ogbomoso, Nigeria between January 2020 and December, 2021.

Methodology: Phenotypic and molecular methods of identification of the isolated microorganisms were done. A secondary metabolite of the isolate was obtained. An antibiotic sensitivity test of its metabolites was performed using ten (10) clinical isolates; inhibition zones were measured and recorded for each test organism. Gas chromatography-mass spectrometry (GC-MS) was used to determine the probable bioactive molecules present in the metabolite. The nucleotide sequences of the isolate were translated using Phyre2 and viewed with PyMOL.

Results: The isolate was identified as Streptomyces longisporoflavus. Various zones of inhibition were recorded for each of the tested pathogenic organisms. Five (5) bioactive molecules were identified in the metabolites, with butane-1,1-dibutoxy-2 (1H)-quinolone having the highest peak area. The PYMOL result shows that the protein structure has a 64% identity as a binding molecule.

Conclusion: This study reveals that the local isolates of S. longisporoflavus showed promising antimicrobial potential with bioactive molecules that are potent inhibitors of pathogenic organisms.