. . . . . . . . . . . . . . " "@en . . . . "Virginiamycin M1"@en . . . "Streptogramin A"@en . . "Ostreogrycin A"@en . . . . "Bacteria"@en . . . . . "21411-53-0"@en . "# \"US Biological\":http://www.usbio.net/item/O8070-50"@en . . . . . "Mikamycin A"@en . "For the treatment of bacterial infections."@en . "Virginiamycin M1 is a macrocyclic lactone antibiotic that acts syngeristically with the structurally unrelated cyclic depsipeptides more commonly known as the virginiamycins B (ostreogrycin B or streptogramin B) and S to inhibit peptide elongation. This is achieved by blocking formation of a peptide bond between the growing peptide chain (peptidyl-tRNA) linked to the 50S ribosome and aminoacyl-tRNA. Virginiamycin M1 has proven to be highly active against Gram positive bacteria, particularly methicillin-resistant S. aureus."@en . "experimental"@en . . . . "Pristinamycin IIA"@en . "Pristinamycin IIA is a macrolide antibiotic. It is a member of the streptogramin A group of antibiotics and one component of pristinamycin (the other being pristinamycin IA). It is produced by Streptomyces graminofaciens and other bacteria."@en . .