Four peptide antibiotics, named paenialvin A–D, were isolated from Paenibacillus alvei DSM 29. Mass spectrum analysis determined the molecular masses of paenialvin A–D to be 1891, 1875, 1877, and 1923 Da, respectively. Tandem mass spectra and nuclear magnetic resonance (NMR) were used to elucidate their chemical structures. Paenialvin A–D showed antimicrobial activity against most strains that were tested, including methicillin-resistant Staphalococcus aureus, Staphylococcus aureus, Bacillus subtilis, Loktanella hongkongensis, Escherichia coli, and Pseudomonas aeruginosa. In particular, the minimum inhibitory concentration of paenialvins against Staphalococcus aureus reached 0.8–3.2 μg/mL. Although they were cytotoxic against HeLa cells at a concentration of 50 μg/mL, the lack of hemolysis by paenialvins confirmed that they are potential candidates for anti-tumor drugs.
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The authors would like to thank Dr. Kai-Ling Wang for performing the NMR experiment in Shenzhen University. The work was supported by NSFC grant (#41576140) and COMRA grant (COMRRDA17SC01) to P.Y.Q.
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The authors declare that they have no conflict of interest.
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Infectious Diseases in Clinical Practice (2019)