Abstract
Clostridium perfringens is a gram-positive, spore-forming anaerobic bacterium that plays a substantial role in non-foodborne human, animal, and avian diseases as well as human foodborne disease. Previously discovered C. perfringens bacteriophage lytic enzyme amino acid sequences were utilized to identify putative prophage lysins or autolysins by BLAST analyses encoded by the genomes of C. perfringens isolates. A predicted N-acetylmuramoyl–l-alanine amidase or MurNAc–LAA (also known as peptidoglycan aminohydrolase, NAMLA amidase, NAMLAA, amidase 3, and peptidoglycan amidase; EC 3.5.1.28) was identified that would hydrolyze the amide bond between N-acetylmuramoyl and l-amino acids in certain cell wall glycopeptides. The gene encoding this protein was subsequently cloned from genomic DNA of a C. perfringens isolate by polymerase chain reaction, and the gene product (PlyCpAmi) was expressed to determine if it could be utilized as an antimicrobial to control the bacterium. By spot assay, lytic zones were observed for the purified amidase and the E. coli expression host cellular lysate containing the amidase gene. Turbidity reduction and plate counts of C. perfringens cultures were significantly reduced by the expressed protein and observed morphologies for cells treated with the amidase appeared vacuolated, non-intact, and injured compared to the untreated cells. Among a variety of C. perfringens strains, there was little gene sequence heterogeneity that varied from 1 to 21 nucleotide differences. The results further demonstrate that it is possible to discover lytic proteins encoded in the genomes of bacteria that could be utilized to control bacterial pathogens.
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Acknowledgments
Support for the research was provided by the US Department of Agriculture, Agricultural Research Service (ARS CRIS project #6612-32000-060). The authors acknowledge primary amino acid sequencing and mass spectrometry analyses of the recombinant protein by Ms. Rebekah Woolsey and Dr. Kathleen Schegg at the Nevada Proteomics Center which operates under the auspices of grants from the National Center for Research Resources (5P20RR016464-11) and the National Institute of General Medical Sciences (8 P20 GM103440-11) from the National Institutes of Health.
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Communicated by Erko Stackebrandt.
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Tillman, G.E., Simmons, M., Garrish, J.K. et al. Expression of a Clostridium perfringens genome-encoded putative N-acetylmuramoyl–l-alanine amidase as a potential antimicrobial to control the bacterium. Arch Microbiol 195, 675–681 (2013). https://doi.org/10.1007/s00203-013-0916-4
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DOI: https://doi.org/10.1007/s00203-013-0916-4