Monitoring bacterial resistance to chloramphenicol and other antibiotics by liquid chromatography electrospray ionization tandem mass spectrometry using selected reaction monitoring
作者:Anthony M. Haag、Audrie M. Medina、Ariel E. Royall、Norbert K. Herzog、David W. Niesel
A Novel Metallo-β-Lactamase Involved in the Ampicillin Resistance of Streptococcus pneumoniae ATCC 49136 Strain
作者:Chia-Yu Chang、Hui-Jen Lin、Bor-Ran Li、Yaw-Kuen Li
DOI:10.1371/journal.pone.0155905
日期:——
which is able to deactivate an ampicillin-based antibiotic by hydrolyzing the amide bond of the β-lactam ring. The Michaelis parameter (Km) = 25 μM and turnover number (kcat) = 2 s(-1) were obtained when nitrocefin was utilized as an optically measurable substrate. Through confocal images and western blot analyses with a specific antibody, the indigenous protein was recognized in S. pneumoniae ATCC 49136
Catalytic single-chain antibodies possessing β-lactamase activity selected from a phage displayed combinatorial library using a mechanism-based inhibitor
作者:Fujie Tanaka、Helena Almer、Richard A Lerner、Carlos F Barbas
DOI:10.1016/s0040-4039(99)01695-0
日期:1999.11
Catalytic single-chainantibodies (scFvs) possessing β-lactamase activity were selected from a phage displayed combinatorialantibodylibrary using a penam sulfone mechanism-based inhibitor of β-lactamase. The scFvs FT6 and FT12 catalyzed the hydrolysis of ampicillin with rate accelerations () of 5200 and 320.
Removal of the Side Chain at the Active-Site Serine by a Glycine Substitution Increases the Stability of a Wide Range of Serine β-Lactamases by Relieving Steric Strain
作者:Vlatko Stojanoski、Carolyn J. Adamski、Liya Hu、Shrenik C. Mehta、Banumathi Sankaran、Peter Zwart、B. V. Venkataram Prasad、Timothy Palzkill
DOI:10.1021/acs.biochem.6b00056
日期:2016.5.3
β-lactamases. Six different enzymes comprising representatives from each of the three classes of serine β-lactamases were examined, including TEM-1, CTX-M-14, and KPC-2 of class A, P99 of class C, and OXA-48 and OXA-163 of class D. For each enzyme, the wild type and a serine-to-glycine mutant were evaluated for stability. The glycine mutants all exhibited enhanced thermostability compared to that of the
Antibodies for penicilloic acid their preparation and use
申请人:Syntex (U.S.A.) Inc.
公开号:US04596768A1
公开(公告)日:1986-06-24
Conjugates of penicilloic acid derivatives and certain poly(amino acids), which are either antigenic or enzymatic, are provided. Antibodies raised against the antigenic poly(amino acids) and the enzyme conjugates are used as reagents in immunoassays. In particular, the compounds of the present invention can be used for measuring the presence of a .beta.-lactamase in a patient serum sample by adding a known amount of penicillin to the sample and observing the production of penicilloic acid over a fixed period of time.