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Article

Assessment of Phenotype Relevant Amino Acid Residues in TEM-β-Lactamases by Mathematical Modelling and Experimental Approval

1
Institute for Infectious Disease and Infection Control, Jena University Hospital, Am Klinikum 1, 07747 Jena, Germany
2
InfectoGnostics Research Campus, 07743 Jena, Germany
3
Instrumental Analysis Group, University of Applied Sciences, 07745 Jena, Germany
4
Institute of Physical Chemistry, Friedrich Schiller University Jena, 07743 Jena, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Thierry Naas
Microorganisms 2021, 9(8), 1726; https://doi.org/10.3390/microorganisms9081726
Received: 2 July 2021 / Revised: 26 July 2021 / Accepted: 10 August 2021 / Published: 13 August 2021
(This article belongs to the Special Issue ß-Lactamases)
Single substitutions or combinations of them alter the hydrolytic activity towards specific β-lactam-antibiotics and β-lactamase inhibitors of TEM-β-lactamases. The sequences and phenotypic classification of allelic TEM variants, as provided by the NCBI National Database of Antibiotic Resistant Organisms, does not attribute phenotypes to all variants. Some entries are doubtful as the data assessment differs strongly between the studies or no data on the methodology are provided at all. This complicates mathematical and bioinformatic predictions of phenotypes that rely on the database. The present work aimed to prove the role of specific substitutions on the resistance phenotype of TEM variants in, to our knowledge, the most extensive mutagenesis study. In parallel, the predictive power of extrapolation algorithms was assessed. Most well-known substitutions with direct impact on the phenotype could be reproduced, both mathematically and experimentally. Most discrepancies were found for supportive substitutions, where some resulted in antagonistic effects in contrast to previously described synergism. The mathematical modelling proved to predict the strongest phenotype-relevant substitutions accurately but showed difficulties in identifying less prevalent but still phenotype transforming ones. In general, mutations increasing cephalosporin resistance resulted in increased sensitivity to β-lactamase inhibitors and vice versa. Combining substitutions related to cephalosporin and β-lactamase inhibitor resistance in almost all cases increased BLI susceptibility, indicating the rarity of the combined phenotype. View Full-Text
Keywords: antimicrobial resistance; Gram-negative bacteria; molecular diagnostics; extended-spectrum beta-lactamases; beta-lactamase-inhibitor antimicrobial resistance; Gram-negative bacteria; molecular diagnostics; extended-spectrum beta-lactamases; beta-lactamase-inhibitor
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MDPI and ACS Style

Madzgalla, S.; Duering, H.; Hey, J.C.; Neubauer, S.; Feller, K.-H.; Ehricht, R.; Pletz, M.W.; Makarewicz, O. Assessment of Phenotype Relevant Amino Acid Residues in TEM-β-Lactamases by Mathematical Modelling and Experimental Approval. Microorganisms 2021, 9, 1726. https://doi.org/10.3390/microorganisms9081726

AMA Style

Madzgalla S, Duering H, Hey JC, Neubauer S, Feller K-H, Ehricht R, Pletz MW, Makarewicz O. Assessment of Phenotype Relevant Amino Acid Residues in TEM-β-Lactamases by Mathematical Modelling and Experimental Approval. Microorganisms. 2021; 9(8):1726. https://doi.org/10.3390/microorganisms9081726

Chicago/Turabian Style

Madzgalla, Sara, Helena Duering, Jana C. Hey, Svetlana Neubauer, Karl-Heinz Feller, Ralf Ehricht, Mathias W. Pletz, and Oliwia Makarewicz. 2021. "Assessment of Phenotype Relevant Amino Acid Residues in TEM-β-Lactamases by Mathematical Modelling and Experimental Approval" Microorganisms 9, no. 8: 1726. https://doi.org/10.3390/microorganisms9081726

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