Oritavancin (diphosphate)

Oritavancin diphosphate (LY333328 diphosphate), a semisynthetic derivative of Vancomycin (HY-B0671), is an orally active glycopeptide antibiotic with bactericidal activity against gram-positive organisms. Oritavancin diphosphate shows antibacterial effect against B. anthracis, such as Ames strain with a MIC value of 0.015 g/mL. Oritavancin diphosphate inhibits cell wall synthesis and disrupts the membrane potential. Oritavancin diphosphate inhibits ArlS kinase activity thereby interfering the signal transduction. Oritavancin diphosphate enters cells by adsorptive endocytosis, which drives it to lysosomes, where it exerts antibiotic activity[1][2][3][4][5].

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[1]Arhin FF, et al. Effect of polysorbate 80 on oritavancin binding to plastic surfaces: implications for susceptibility testing. Antimicrob Agents Chemother. 2008 May;52(5):1597-1603.|[2]Coyle EA, et al. Activity of oritavancin (LY333328), an investigational glycopeptide, compared to that of vancomycin against multidrug-resistant Streptococcus pneumoniae in an in vitro pharmacodynamic model. Antimicrob Agents Chemother. 2001 Mar;45(3):706-9.|[3]Bai J, et al. The role of ArlRS in regulating oxacillin susceptibility in methicillin-resistant Staphylococcus aureus indicates it is a potential target for antimicrobial resistance breakers[J]. Emerg Microbes Infect. 2019;8(1):503-515.|[4]Van Bambeke F, et al. Cellular pharmacokinetics and pharmacodynamics of the glycopeptide antibiotic oritavancin (LY333328) in a model of J774 mouse macrophages[J]. Antimicrob Agents Chemother. 2004 Aug;48(8):2853-60.|[5]Heine HS, et al. Efficacy of oritavancin in a murine model of Bacillus anthracis spore inhalation anthrax. Antimicrob Agents Chemother. 2008 Sep;52(9):3350-7.