telithromycin

Telithromycin is a semisynthetic 14-membered macrolide antibiotic and erythromycin derivative that binds to the 50S subunit of the 70S bacterial ribosome, inhibits bacterial protein synthesis, and exhibits antimicrobial activity against a wide range of gram-positive and gram-negative bacteria for the treatment of mild to moderate respiratory infections.

5'-Guanylic acid disodium salt (GMP-5) is a purine ribonucleoside monophosphate. L-Glutamic acid and guanosine monophosphate are biosynthesized from xanthylic acid and L-glutamine via GMP synthase [glutamine-hydrolyzing]. Guanosine triphosphate and guanosine monophosphate are biosynthesized from diguanosine tetraphosphate via bis(5'-nucleosyl)-tetraphosphatase [asymmetrical]. In humans, guanosine monophosphate is involved in the kanamycin, telithromycin, tobramycin, and erythromycin action pathways, and several metabolic disorders including AICA-ribosiduria, adenosine deaminase deficiency, adenine phosphoribosyltransferase deficiency (aprt), and 2-hydroxyglutric aciduria (D and L form) pathways. Guanosine monophosphate is also found in foods like onion-family vegetables, millet, Chinese water chestnut, and red rice, serving as a potential biomarker for the consumption of these foods.

Nafithromycin (WCK 4873) serves as an orally administered antibiotic effective against community-acquired pneumonia organisms such as Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, and Methicillin-susceptible Staphylococcus aureus. It displays a minimum inhibitory concentration (MIC 90) of 0.12 mg liter against both macrolide-resistant and telithromycin-insensitive Streptococcus pneumoniae.