Ostreogrycin A (virginiamycin M1, streptogramin A) is the major component of the virginiamycin complex. In the 1950s this complex was independently discovered so many times that the literature became highly confusing. Ostreogrycin A is a macrocyclic lactone antibiotic that acts synergistically with the structurally unrelated cyclic depsipeptides, virginiamycin B (ostreogrycin B, streptogramin B) and virginiamycin S, to inhibit peptide elongation. Ostreogrycin A is highly active against Gram positive bacteria, particularly MRSA.
Ostreogrycin A is soluble in DMF or DMSO. Moderately soluble in methanol or ethanol. Poor water solubility.
CAS Number
21411-53-0
Molecular Formula
C28H35N3O7
Molecular Weight
525.6
Mechanism of Action
Ostreogrycin A functions by blocking formation of a peptide bond between the growing peptide chain (peptidyl-tRNA) linked to the 50S ribosome and aminoacyl-tRNA.
Storage Conditions
-20°C