Abstract
Screening for producers of potent antimicrobial peptides, resulted in the isolation of Bacillus cereus BGNM1 with strong antimicrobial activity against Listeria monocytogenes. Genome sequence analysis revealed that BGNM1 contains the gene cluster associated with the production of the lantibiotic, thusin, previously identified in B. thuringiensis. Purification of the antimicrobial activity confirmed that strain BGMN1 produces thusin. Both thusin sensitive and resistant strains were detected among clinical isolates of Streptococcus agalactiae. Random mutagenesis of a thusin sensitive strain, S. agalactiae B782, was performed in an attempt to identify the receptor protein for thusin. Three independent thusin resistant mutants were selected and their complete genomes sequenced. Comparative sequence analysis of these mutants with the WT strain revealed that duplication of a region encoding a 79 amino acids repeat in a C-protein α-antigen was a common difference, suggesting it to be responsible for increased resistance to thusin. Since induced thusin resistant mutants showed higher level of resistance than the naturally resistant B761 strain, complete genome sequencing of strain B761 was performed to check the integrity of the C-protein α-antigen-encoding gene. This analysis revealed that this gene is deleted in B761, providing further evidence that this protein promotes interaction of the thusin with receptor.
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This work was partly funded by the Ministry of Education, Science and Technological Development of the Republic of Serbia, Republic of Serbia (Grant No.173019, awarded to MK).
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The study was conceptualized by MK and NM. Laboratory work was done by NM, MO, POC and MK. Whole-genome analysis was carried out by BF and MK. Supervision, Project administration and Funding were carried out by MK. The manuscript was drafted by NM, MO and POC, reviewed by BJ and edited by MK, POC and PC. All authors have read and approved the final version of the manuscript.
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Mirkovic, N., Obradovic, M., O’Connor, P.M. et al. C-protein α-antigen modulates the lantibiotic thusin resistance in Streptococcus agalactiae. Antonie van Leeuwenhoek 114, 1595–1607 (2021). https://doi.org/10.1007/s10482-021-01626-3
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DOI: https://doi.org/10.1007/s10482-021-01626-3