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dc.contributor.authorSamy, R.
dc.contributor.authorThwin, M.
dc.contributor.authorStiles, B.
dc.contributor.authorSatyanarayana-Jois, S.
dc.contributor.authorChinnathambi, A.
dc.contributor.authorZayed, M.
dc.contributor.authorAlharbi, S.
dc.contributor.authorSiveen, K.
dc.contributor.authorSikka, S.
dc.contributor.authorKumar, Alan Prem
dc.contributor.authorSethi, G.
dc.contributor.authorLim, L.
dc.identifier.citationSamy, R. and Thwin, M. and Stiles, B. and Satyanarayana-Jois, S. and Chinnathambi, A. and Zayed, M. and Alharbi, S. et al. 2015. Novel phospholipase A2 inhibitors from python serum are potent peptide antibiotics. Biochimie. 111: pp. 30-44.

Antimicrobial peptides (AMPs) play a vital role in defense against resistant bacteria. In this study, eight different AMPs synthesized from Python reticulatus serum protein were tested for bactericidal activity against various Gram-positive and Gram-negative bacteria (Staphylococcus aureus, Burkholderia pseudomallei (KHW and TES strains), and Proteus vulgaris) using a disc-diffusion method (20 µg/disc). Among the tested peptides, phospholipase A2 inhibitory peptide (PIP)-18[59-76], ß-Asp65-PIP[59-67], D-Ala66-PNT.II, and D60,65E-PIP[59-67] displayed the most potent bactericidal activity against all tested pathogens in a dose-dependent manner (100-6.8 µg/ml), with a remarkable activity noted against S. aureus at 6.8 µg/ml dose within 6 h of incubation. Determination of minimum inhibitory concentrations (MICs) by a micro-broth dilution method at 100-3.125 µg/ml revealed that PIP-18[59-76], ß-Asp65-PIP[59-67] and D-Ala66-PNT.II peptides exerted a potent inhibitory effect against S. aureus and B. pseudomallei (KHW) (MICs 3.125 µg/ml), while a much less inhibitory potency (MICs 12.5 µg/ml) was noted for ß-Asp65-PIP[59-67] and D-Ala66-PNT.II peptides against B. pseudomallei (TES). Higher doses of peptides had no effect on the other two strains (i.e., Klebsiella pneumoniae and Streptococcus pneumoniae).Overall, PIP-18[59-76] possessed higher antimicrobial activity than that of chloramphenicol (CHL), ceftazidime (CF) and streptomycin (ST) (30 µg/disc). When the two most active peptides, PIP-18[59-76] and ß-Asp65-PIP[59-67], were applied topically at a 150 mg/kg dose for testing wound healing activity in a mouse model of S. aureus infection, the former accelerates faster wound healing than the latter peptide at 14 days post-treatment. The western blot data suggest that the topical application of peptides (PIP-18[59-67] and ß-Asp65-PIP[59-67]) modulates NF-kB mediated wound repair in mice with relatively little haemolytic (100-1.56 µg/ml) and cytotoxic (1000-3.125 µg/ml) effects evident on human cells in vitro.

dc.titleNovel phospholipase A2 inhibitors from python serum are potent peptide antibiotics
dc.typeJournal Article
curtin.departmentSchool of Biomedical Sciences
curtin.accessStatusFulltext not available

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