Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs
At present, antibiotics options to cure infections caused by drug resistant Gram-negative pathogens are highly inadequate. LPS outer membrane, proteins involved in LPS transport and biosynthesis pathways are vital targets. Thanatin, an insect derived 21-residue long antimicrobial peptide may be exp...
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sg-ntu-dr.10356-1616152022-09-17T23:31:25Z Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs Sinha, Sheetal Dhanabal, Vidhya Bharathi Sperandeo, Paola Polissi, Alessandra Bhattacharjya, Surajit School of Biological Sciences Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Advanced Environmental Biotechnology Centre (AEBC) Science::Biological sciences::Biophysics Host Defense Antimicrobial Peptide Thanatin At present, antibiotics options to cure infections caused by drug resistant Gram-negative pathogens are highly inadequate. LPS outer membrane, proteins involved in LPS transport and biosynthesis pathways are vital targets. Thanatin, an insect derived 21-residue long antimicrobial peptide may be exploited for the development of effective antibiotics against Gram-negative bacteria. As a mode of bacterial cell killing, thanatin disrupts LPS outer membrane and inhibits LPS transport by binding to the periplasmic protein LptAm. Here, we report structure-activity correlation of thanatin and analogs for the purpose of rational design. These analogs of thanatin are investigated, by NMR, ITC and fluorescence, to correlate structure, antibacterial activity and binding with LPS and LptAm, a truncated monomeric variant. Our results demonstrate that an analog thanatin M21F exhibits superior antibacterial activity. In LPS interaction analyses, thanatin M21F demonstrate high affinity binding to outer membrane LPS. The atomic resolution structure of thanatin M21F in LPS micelle reveals four stranded -sheet structure in a dimeric topology whereby the sidechain of aromatic residues Y10, F21 sustained mutual packing at the interface. Strikingly, LptAm binding affinity of thanatin M21F has been significantly increased with an estimated Kd~0.73 nM vs 13 nM for thanatin. Further, atomic resolution structures and interactions of Ala based thanatin analogs define plausible correlations with antibacterial activity and LPS, LptAm interactions. Taken together, the current work provides a frame-work for the designing of thanatin based potent antimicrobial peptides for the treatment of drug resistance Gram-negative bacteria. Ministry of Education (MOE) Submitted/Accepted version This work was supported by the grant from Ministry of Education (MOE), Singapore. 2022-09-12T07:40:15Z 2022-09-12T07:40:15Z 2022 Journal Article Sinha, S., Dhanabal, V. B., Sperandeo, P., Polissi, A. & Bhattacharjya, S. (2022). Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs. Biochimica et Biophysica Acta (BBA) - Biomembranes, 1864(3), 183839-. https://dx.doi.org/10.1016/j.bbamem.2021.183839 0005-2736 https://hdl.handle.net/10356/161615 10.1016/j.bbamem.2021.183839 3 1864 183839 en Biochimica et Biophysica Acta (BBA) - Biomembranes © 2021 Elsevier B.V. All rights reserved. This paper was published in Biochimica et Biophysica Acta (BBA) - Biomembranes and is made available with permission of Elsevier B.V. application/pdf |
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Science::Biological sciences::Biophysics Host Defense Antimicrobial Peptide Thanatin |
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Science::Biological sciences::Biophysics Host Defense Antimicrobial Peptide Thanatin Sinha, Sheetal Dhanabal, Vidhya Bharathi Sperandeo, Paola Polissi, Alessandra Bhattacharjya, Surajit Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs |
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At present, antibiotics options to cure infections caused by drug resistant Gram-negative pathogens are highly inadequate. LPS outer membrane, proteins involved in LPS transport and biosynthesis pathways are vital targets. Thanatin, an insect derived 21-residue long antimicrobial peptide may be exploited for the development of effective antibiotics against Gram-negative bacteria. As a mode of bacterial cell killing, thanatin disrupts LPS outer membrane and inhibits LPS transport by binding to the periplasmic protein LptAm. Here, we report structure-activity correlation of thanatin and analogs for the purpose of rational design. These analogs of thanatin are investigated, by NMR, ITC and fluorescence, to correlate structure, antibacterial activity and binding with LPS and LptAm, a truncated monomeric variant. Our results demonstrate that an analog thanatin M21F exhibits superior antibacterial activity. In LPS interaction analyses, thanatin M21F demonstrate high affinity binding to outer membrane LPS. The atomic resolution structure of thanatin M21F in LPS micelle reveals four stranded -sheet structure in a dimeric topology whereby the sidechain of aromatic residues Y10, F21 sustained mutual packing at the interface. Strikingly, LptAm binding affinity of thanatin M21F has been significantly increased with an estimated Kd~0.73 nM vs 13 nM for thanatin. Further, atomic resolution structures and interactions of Ala based thanatin analogs define plausible correlations with antibacterial activity and LPS, LptAm interactions. Taken together, the current work provides a frame-work for the designing of thanatin based potent antimicrobial peptides for the treatment of drug resistance Gram-negative bacteria. |
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School of Biological Sciences |
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School of Biological Sciences Sinha, Sheetal Dhanabal, Vidhya Bharathi Sperandeo, Paola Polissi, Alessandra Bhattacharjya, Surajit |
format |
Article |
author |
Sinha, Sheetal Dhanabal, Vidhya Bharathi Sperandeo, Paola Polissi, Alessandra Bhattacharjya, Surajit |
author_sort |
Sinha, Sheetal |
title |
Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs |
title_short |
Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs |
title_full |
Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs |
title_fullStr |
Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs |
title_full_unstemmed |
Linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and LptAm binding of designed analogs |
title_sort |
linking dual mode of action of host defense antimicrobial peptide thanatin: structures, lipopolysaccharide and lptam binding of designed analogs |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/161615 |
_version_ |
1744365422240595968 |