Rezvaneh Mansori - Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Lahijan Branch, Lahijan, Iran,
Khosro Issazadeh - Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Lahijan Branch, Lahijan, Iran,
Majid Khoshkholgh Pahlaviani - Department of Biotechnology, Faculty of Basic Sciences, Islamic Azad University, Lahijan Branch, Lahijan, Iran,
Mirsasan Mirpour - Department of Microbiology, Faculty of Basic Sciences, Islamic Azad University, Lahijan Branch, Lahijan, Iran,

Antibiotics are the best known products of actinomycete. Over ۵,۰۰۰ antibiotics have been identified from the cultures of Gram positive and Gram-negative organisms, and filamentous fungi, but only about ۱۰۰ antibiotics have commercially been used to treat human, animal and plant diseases. The genus, Streptomycete, is responsible for the formation of more than ۶۰% of known antibiotics. Bacterial urinary tract infections are frequent in the outpatient as well as in the nosocomial setting. The common bacteria from UTIs were isolated from hospital and laboratory samples. The present study was designed to isolate Gram-negative bacteria from urinary tract infections and evaluate Streptomyces gresiofuscus PTCC۱۶۲۸ antimicrobial activity against pathogenic bacteria. Bacterial isolates were identified as Acinetobater spp. and Pseudomonas aeruginosa. The antimicrobial activity was examined by the agar Well diffusion method. The cell free supernatants of the S.gresiofuscus were able to inhibit the growth of all human pathogens (Acinetobacter spp. and P.aeruginosa) isolated in this study in Well diffusion method. The isolates also showed very promising activities against multi drug resistant human pathogens. Concentrations of produced compounds by S.griseofuscus PTCC۱۶۲۸ were determined by GC-MS method.

S. griseofuscus, Urinary tract infections, Antagonistic Activity