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Interaction of the pBR 322-coded RTEM beta-lactamase with substrates. Evidence for specific conformational transitions. 1982

N Citri, and N Zyk

The rate of inactivation of RTEM-1 beta-lactamase by Pronase is accelerated by class A ('resistant') penicillins. Other substrates (class S penicillin and cephalosporins) protect against the inactivation. Cefoxitin, a semi-synthetic cephamycin, induces a more extensive, hysteretic response. In its presence the enzyme is inactivated by trypsin as well as by Pronase.

UI MeSH Term Description Entries
D010406 Penicillins A group of antibiotics that contain 6-aminopenicillanic acid with a side chain attached to the 6-amino group. The penicillin nucleus is the chief structural requirement for biological activity. The side-chain structure determines many of the antibacterial and pharmacological characteristics. (Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed, p1065) Antibiotics, Penicillin,Penicillin,Penicillin Antibiotics
D010957 Plasmids Extrachromosomal, usually CIRCULAR DNA molecules that are self-replicating and transferable from one organism to another. They are found in a variety of bacterial, archaeal, fungal, algal, and plant species. They are used in GENETIC ENGINEERING as CLONING VECTORS. Episomes,Episome,Plasmid
D011402 Pronase A proteolytic enzyme obtained from Streptomyces griseus. Pronase E,Pronase P,Protease XIV,XIV, Protease
D011487 Protein Conformation The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain). Conformation, Protein,Conformations, Protein,Protein Conformations
D002440 Cefoxitin A semisynthetic cephamycin antibiotic resistant to beta-lactamase. Cefoxitin Sodium,MK-306,Mefoxin,Mefoxitin,Méfoxin,MK 306,MK306,Sodium, Cefoxitin
D002511 Cephalosporins A group of broad-spectrum antibiotics first isolated from the Mediterranean fungus ACREMONIUM. They contain the beta-lactam moiety thia-azabicyclo-octenecarboxylic acid also called 7-aminocephalosporanic acid. Antibiotics, Cephalosporin,Cephalosporanic Acid,Cephalosporin,Cephalosporin Antibiotic,Cephalosporanic Acids,Acid, Cephalosporanic,Acids, Cephalosporanic,Antibiotic, Cephalosporin,Cephalosporin Antibiotics
D001618 beta-Lactamases Enzymes found in many bacteria which catalyze the hydrolysis of the amide bond in the beta-lactam ring. Well known antibiotics destroyed by these enzymes are penicillins and cephalosporins. beta-Lactamase,beta Lactamase,beta Lactamases

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