Tyrocidine complex is a mixture of cyclic decapeptides originally isolated from B. brevis. It is active against Gram-positive and Gram-negative bacteria. It forms a complex with single- and double-stranded DNA to inhibit RNA synthesis.
Bacitracin complex is a bacitracin antibiotic complex composed of cyclic dipeptides that has been found inBacillus.1It is metal-dependent and is complexed to a divalent metal cation, such as Cu2+, Ni2+, Co2+, Zn2+, or Mn2+, for its activity.1,2Bacitracin complex is a mixture of bacitracin polypeptides in complex with copper.
1.Piacham, T., Isarankura-Na-Ayudhya, C., Nantasenamat, C., et al.Metalloantibiotic Mn(II)-bacitracin complex mimicking manganese superoxide dismutaseBiochem. Biophys. Res. Commun.341(4)925-930(2006) 2.Rodríguez-Uribe, N.A., Pérez-González, R., Domínguez-Mendoza, B.E., et al.Metallobacitracins: Affinity and structural study in aqueous solutionInorg. Chem. Commun.10461-70(2019)
Parvodicin complex is a mixture of closely related lipophilic glycopeptides originally isolated from A. parvosata. The parvodicin complex has activity against Gram-positive bacteria (MICs = 0.8-12.5 μg/ml) including methicillin-resistant strains of S. aureus (MRSA), S. hemolyticus, and E. faecalis (MICs = 0.1-25 μg/ml). Glycopeptide antibiotics act by preventing cell wall synthesis by binding and sequestering a cell wall precursor with a D-alanine-containing peptide.