Abstract
A systematic analysis of beta-lactamases based on comparative proteomics has not been performed thus far. In this report, we searched for the presence of beta-lactam-related proteins in 591 bacterial proteomes belonging to 52 species that are pathogenic to humans. The amino acid sequences for 19 different types of beta-lactamases (ACT, CARB, CifA, CMY, CTX, FOX, GES, GOB, IMP, IND, KPC, LEN, OKP, OXA, OXY, SHV, TEM, NDM, and VIM) were obtained from the ARG-ANNOT database and were used to construct 19 HMM profiles, which were used to identify potential beta-lactamases in the completely sequenced bacterial proteomes. A total of 2877 matches that included the word “beta-lactamase” and/or “penicillin” in the functional annotation and/or in any of its regions were obtained. These enzymes were mainly described as “penicillin-binding proteins,” “beta-lactamases,” and “metallo-beta-lactamases” and were observed in 47 of the 52 species studied. In addition, proteins classified as “beta-lactamases” were observed in 39 of the species included. A positive correlation between the number of beta-lactam-related proteins per species and the proteome size was observed (R 0.78, P < 0.00001). This correlation partially explains the high presence of beta-lactam-related proteins in large proteomes, such as Nocardia brasiliensis, Bacillus anthracis, and Mycobacterium tuberculosis, along with their absence in small proteomes, such as Chlamydia spp. and Mycoplasma spp. We detected only five types of beta-lactamases (TEM, SHV, CTX, IMP, and OXA) and other related proteins in particular species that corresponded with those reported in the literature. We additionally detected other potential species-specific beta-lactamases that have not yet been reported. In the future, better results will be achieved due to more accurate sequence annotations and a greater number of sequenced genomes.
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Acknowledgements
We wish to thank to CONACyT for the scholarship granted to AJLBT to perform the present study. The publication of this article was partially funded by DGAPA-UNAM (IN-201117) to E. P-R.
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Brambila-Tapia, A.J.L., Perez-Rueda, E., Barrios, H. et al. Identification of beta-Lactamases and beta-Lactam-Related Proteins in Human Pathogenic Bacteria using a Computational Search Approach. Curr Microbiol 74, 915–920 (2017). https://doi.org/10.1007/s00284-017-1265-3
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DOI: https://doi.org/10.1007/s00284-017-1265-3