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Genetic control of population structure in heterogeneous strains of methicillin resistant Staphylococcus aureus.
de Lencastre H, Figueiredo AM, Tomasz A. de Lencastre H, et al. Eur J Clin Microbiol Infect Dis. 1993;12 Suppl 1:S13-8. doi: 10.1007/BF02389872. Eur J Clin Microbiol Infect Dis. 1993. PMID: 8477757
Experimental evidence is presented indicating that the number of these subpopulations, their resistance level and the frequency with which they are represented in a culture are strain-specific and reproducible with a surprising degree of precision from one culture t …
Experimental evidence is presented indicating that the number of these subpopulations, their resistance level and the frequency with which t …
Beta-lactam-specific resistant mutants of Staphylococcus aureus.
Tonin E, Tomasz A. Tonin E, et al. Antimicrob Agents Chemother. 1986 Oct;30(4):577-83. doi: 10.1128/aac.30.4.577. Antimicrob Agents Chemother. 1986. PMID: 3539012 Free PMC article.
In a highly methicillin-resistant mutant (MIC, 150 micrograms/ml), PBPs 2 and 3 were no longer detectable by the penicillin binding assay. Instead, a new PBP of poor binding capacity and anomalous molecular size (about 78 kilodaltons [kDa]) appeared in these cells. …
In a highly methicillin-resistant mutant (MIC, 150 micrograms/ml), PBPs 2 and 3 were no longer detectable by the penicillin binding a …
Altered penicillin-binding proteins in methicillin-resistant strains of Staphylococcus aureus.
Hartman B, Tomasz A. Hartman B, et al. Antimicrob Agents Chemother. 1981 May;19(5):726-35. doi: 10.1128/aac.19.5.726. Antimicrob Agents Chemother. 1981. PMID: 7294764 Free PMC article.
The penicillin-binding proteins (PBPs) of a methicillin-resistant (MR) and a methicillin-susceptible (MS) Staphylococcus aureus were compared by various approaches involving the use of high-specific-activity [3H]penicillin as a reagent. ...Thus, the pH-depend …
The penicillin-binding proteins (PBPs) of a methicillin-resistant (MR) and a methicillin-susceptible (MS) Staphylococcus aureu …
Increased amounts of a novel penicillin-binding protein in a strain of methicillin-resistant Staphylococcus aureus exposed to nafcillin.
Chambers HF, Hartman BJ, Tomasz A. Chambers HF, et al. J Clin Invest. 1985 Jul;76(1):325-31. doi: 10.1172/JCI111965. J Clin Invest. 1985. PMID: 4019783 Free PMC article.
In addition to the four typical penicillin-binding proteins (PBPs), a strain of heterogeneously methicillin-resistant Staphylococcus aureus produced an extra 78-kD PBP (PBP 2a) that had a low affinity for nafcillin and penicillin. Addition of nafcillin to cultures o …
In addition to the four typical penicillin-binding proteins (PBPs), a strain of heterogeneously methicillin-resistant Staphylococcus …
Peptidoglycan composition of a highly methicillin-resistant Staphylococcus aureus strain. The role of penicillin binding protein 2A.
de Jonge BL, Chang YS, Gage D, Tomasz A. de Jonge BL, et al. J Biol Chem. 1992 Jun 5;267(16):11248-54. J Biol Chem. 1992. PMID: 1597460
This extra PBP is thought to be a transpeptidase essential for the continued cell wall synthesis and growth in the presence of beta-lactam antibiotics. ...Our experiments provided no experimental data for a unique transpeptidase activity associated with PBP2A....
This extra PBP is thought to be a transpeptidase essential for the continued cell wall synthesis and growth in the presence of beta-l …
Two bactericidal targets for penicillin in pneumococci: autolysis-dependent and autolysis-independent killing mechanisms.
Moreillon P, Markiewicz Z, Nachman S, Tomasz A. Moreillon P, et al. Antimicrob Agents Chemother. 1990 Jan;34(1):33-9. doi: 10.1128/aac.34.1.33. Antimicrob Agents Chemother. 1990. PMID: 1691615 Free PMC article.
(ii) Mutants from which the amidase was completely eliminated by plasmid insertion or deletion (Lyt-) were still killed, albeit at a slower rate than the wild-type Lyt+ strains (3 to 4 log units instead of 4 to 5 log units per 6 h, i.e., about 1 log unit slower than the wi …
(ii) Mutants from which the amidase was completely eliminated by plasmid insertion or deletion (Lyt-) were still killed, albeit at a
Ribotype delineation and description of Staphylococcus sciuri subspecies and their potential as reservoirs of methicillin resistance and staphylolytic enzyme genes.
Kloos WE, Ballard DN, Webster JA, Hubner RJ, Tomasz A, Couto I, Sloan GL, Dehart HP, Fiedler F, Schubert K, de Lencastre H, Sanches IS, Heath HE, Leblanc PA, Ljungh A. Kloos WE, et al. Int J Syst Bacteriol. 1997 Apr;47(2):313-23. doi: 10.1099/00207713-47-2-313. Int J Syst Bacteriol. 1997. PMID: 9103615
Normalized ribotyping subdivided the S. sciuri patterns into three blocks of patterns, each corresponding to a subspecies. Each subspecies formed a separate, well-defined DNA similarity group when DNA-DNA hybridizations were conducted under stringent (70 degrees C) …
Normalized ribotyping subdivided the S. sciuri patterns into three blocks of patterns, each corresponding to a subspecies. Each subsp …
Naturally occurring peptidoglycan variants of Streptococcus pneumoniae.
Severin A, Tomasz A. Severin A, et al. J Bacteriol. 1996 Jan;178(1):168-74. doi: 10.1128/jb.178.1.168-174.1996. J Bacteriol. 1996. PMID: 8550412 Free PMC article.
Analysis by high-performance liquid chromatography of the stem peptide composition of cell walls purified from a large number of pneumococcal strains indicates that these bacteria produce a highly conserved species-specific peptidoglycan independent of serotype, iso …
Analysis by high-performance liquid chromatography of the stem peptide composition of cell walls purified from a large number of pneu …
Selective lysis of cultures and cell walls of penicillin-resistant but not penicillin-susceptible Streptococcus pneumoniae strains by a murein hydrolase complex.
Severin A, Tomasz A. Severin A, et al. J Bacteriol. 1995 Jun;177(11):3316-9. doi: 10.1128/jb.177.11.3316-3319.1995. J Bacteriol. 1995. PMID: 7768833 Free PMC article.
A murein hydrolase complex selectively lysed cultures of penicillin-resistant pneumococci and their cell walls in which the majority of muropeptide subunits were indirectly cross-linked through oligopeptide substituents (alanyl-alanine or alanyl-serine) on the epsilon-amin
A murein hydrolase complex selectively lysed cultures of penicillin-resistant pneumococci and their cell walls in which the majority
Autolysis-resistant peptidoglycan of anomalous composition in amino-acid-starved Escherichia coli.
Tuomanen E, Markiewicz Z, Tomasz A. Tuomanen E, et al. J Bacteriol. 1988 Mar;170(3):1373-6. doi: 10.1128/jb.170.3.1373-1376.1988. J Bacteriol. 1988. PMID: 2893787 Free PMC article.
Nongrowing Escherichia coli deprived of an essential amino acid continued to produce peptidoglycan at a rate approximately 30% of that of growing cells. ...
Nongrowing Escherichia coli deprived of an essential amino acid continued to produce peptidoglycan at a rate approximately 30% of tha …
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