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Penem molecules do not occur naturally, and production of penems is an entirely synthetic process. Five main penem subgroups — thiopenems, oxypenems, aminopenems, alkylpenems, and arylpenems — have been produced and are distinguished by the side chain (at position 2) of the unsaturated five-membered ring.
Faropenem is closely related, but it is a penem, not a carbapenem. [43] Antimicrobial resistance. NDM-1 is an enzyme that introduces bacterial resistance to carbapenem antibiotics via hydrolysis of the carbapenem backbone, thereby inactivating its ability to inhibit cell wall synthesis.
β-Lactam antibiotics are indicated for the prevention and treatment of bacterial infections caused by susceptible organisms. At first, β-lactam antibiotics were mainly active only against gram-positive bacteria, yet the recent development of broad-spectrum β-lactam antibiotics active against various gram-negative organisms has increased their usefulness.
(D) A penem. (E) A carbapenem. (F) A monobactam. (G) A cephem. (H) A carbacephem. (I) An oxacephem. This is a list of common β-lactam antibiotics—both administered drugs and those not in clinical use—organized by structural class. Antibiotics are listed alphabetically within their class or subclass by their nonproprietary name.
Penams are the primary skeleton structures that define the penicillin subclass of the broader β-lactam family of antibiotics and related compounds. They are bicyclic ring systems containing a β-lactam moiety fused with a five-member thiazolidine ring.
The structure of a Streptomyces serine β-lactamase (SBLs) is given by 1BSG.The alpha-beta fold (InterPro: IPR012338) resembles that of a DD-transpeptidase, from which the enzyme is thought to have evolved. β-lactam antibiotics bind to DD-transpeptidases to inhibit bacterial cell wall biosynthesis.
A carbapenam is a β-lactam compound that is a saturated carbapenem. [1] They exist primarily as biosynthetic intermediates on the way to the carbapenem antibiotics. Structure of (3S,5R)-carbapenam-3-carboxylic acid
Meropenem, sold under the brand name Merrem among others, is an intravenous carbapenem antibiotic used to treat a variety of bacterial infections. [3] Some of these include meningitis, intra-abdominal infection, pneumonia, sepsis, and anthrax. [3]