Virginiamycin B is a depsipeptide antibiotic co-produced with ostreogrycin A, together used as a syngergistic mixture. Virginiamycin B, also known as ostreogrycin B and streptogramin B among other synonyms, was discovered independently and named by several groups, leading to considerable confusion in the literature. Viriginiamycin B acts a syngergist, binding to the conformational change of the peptidyl transferase centre of the 50S ribosome induced by ostreogrycin A.
One of the two major components of Pristinamycin (Pristinamycin IA and Pristinamycin IIA (or Virginiamycin M1-V673810).
ChEBI: A cyclodepsipeptide that is (together with pristinamycin IIA) a component of pristinamycin, an oral streptogramin antibiotic produced by Streptomyces pristinaespiralis. Pristinamycin exhibits bactericidal activity against Gram positive organis
s including methicillin-resistant Staphylococcus aureus.
Pristinamycin is a systemic antibiotic of the synergistins/
streptogramins class, composed of two subunits: pristinamycin
IA and pristinamycin IIA. It induces several
types of drug reactions such as maculo-papular exanthema,
systemic dermatitis, or acute generalized exanthematous
pustulosis. Some patients have been previously
skin-sensitized by virginiamycin. Crossreactivity
is expected to virginiamycin and to the associated dalfopristin
and quinupristin.
