Methicillin Totally Explained

Everything about Methicillin totally explained

Methicillin (USAN) or meticillin (INN, BAN) is a narrow spectrum beta-lactam antibiotic of the penicillin class. It was developed by Beecham in 1959. It was previously used to treat infections caused by susceptible Gram-positive bacteria, particularly beta-lactamase-producing organisms such as Staphylococcus aureus that would otherwise be resistant to most penicillins, but is no longer clinically used. Its role in therapy has been largely replaced by flucloxacillin and dicloxacillin, however the term methicillin-resistant Staphylococcus aureus (MRSA) continues to be used to describe Staphylococcus aureus strains resistant to all penicillins. Meticillin is no longer in manufacture as the more stable and similar penicillins; oxacillin (used for clinical antimicrobial susceptibility testing), flucloxacillin and dicloxacillin are used medically.

Mode of action

Main article: Beta-lactam antibiotic Like other beta-lactam antibiotics, methicillin acts by inhibiting the synthesis of bacterial cell walls. It inhibits cross-linkage between the linear peptidoglycan polymer chains that make up a major component of the cell wall of Gram-positive bacteria. It does this by binding to and competitively inhibiting the transpeptidase enzyme used by bacteria to cross-link the peptide (D-alanyl-alanine) used in peptidoglycan synthesis. Methicillin and other beta-lactam antibiotics are structural analogs of D-alanyl-alanine, and the transpeptidase enzymes that bind to them are sometimes called penicillin binding proteins (PBPs). (Gladwin and Trattler, 2004)

Medicinal chemistry

Methicillin is insensitive to beta-lactamase (also known as penicillinase) enzymes secreted by many penicillin-resistant bacteria. The presence of the ortho-dimethoxyphenyl group directly attached to the side chain carbonyl group of the penicillin nucleus facilitates the β-lactamase resistance, since those enzymes are relatively intolerant of side-chain steric hindrance. Thus it's able to bind to penicillin binding proteins (PBPs) and inhibit peptidoglycan crosslinking, but isn't bound by or inactivated by β-lactamases.

Clinical use

Methicillin isn't commonly used in clinical practice, but serves a purpose in the laboratory to determine antibiotic sensitivity in microbiological culture.

Further Information

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