An intrinsically disordered antimicrobial peptide dendrimer from stereorandomized virtual screening.

Cai, Xingguang; Orsi, Markus; Capecchi, Alice; Köhler, Thilo; van Delden, Christian; Javor, Sacha; Reymond, Jean-Louis (2022). An intrinsically disordered antimicrobial peptide dendrimer from stereorandomized virtual screening. Cell reports. Physical science, 3(12), pp. 1-15. Cell Press 10.1016/j.xcrp.2022.101161

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Membrane-disruptive amphiphilic antimicrobial peptides behave as intrinsically disordered proteins by being unordered in water and becoming α-helical in contact with biological membranes. We recently discovered that synthesizing the α-helical antimicrobial peptide dendrimer L-T25 ((KL)8(KKL)4(KLL)2 KKLL) using racemic amino acids to form stereorandomized sr-T25, an analytically pure mixture of all possible diastereoisomers of L-T25, preserved antibacterial activity but abolished hemolysis and cytotoxicity, pointing to an intrinsically disordered antibacterial conformation and an α-helical cytotoxic conformation. In this study, to identify non-toxic intrinsically disordered homochiral antimicrobial peptide dendrimers (AMPDs), we surveyed sixty-three sr-analogs of sr-T25 selected by virtual screening. One of the analogs, sr-X18 ((KL)8(KLK)4(KLL)2 KLLL), lost antibacterial activity as L-enantiomer and became hemolytic due to α-helical folding. By contrast, the L- and D-enantiomers of sr-X22 ((KL)8(KL)4(KKLL)2 KLKK) were equally antibacterial, non-hemolytic, and non-toxic, implying an intrinsically disordered bioactive conformation. Screening stereorandomized libraries may be generally useful to identify or optimize intrinsically disordered bioactive peptides.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Cai, Xingguang, Orsi, Markus, Capecchi, Alice, Javor, Sacha, Reymond, Jean-Louis

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

2666-3864

Publisher:

Cell Press

Language:

English

Submitter:

Pubmed Import

Date Deposited:

18 Jan 2023 12:50

Last Modified:

18 Jan 2023 15:36

Publisher DOI:

10.1016/j.xcrp.2022.101161

PubMed ID:

36632208

Uncontrolled Keywords:

antimicrobial peptides dendrimers intrinsically disordered proteins membrane disruption multi-drug resistant bacteria multidrug resistance solid-phase peptide synthesis stereorandomization virtual screening

BORIS DOI:

10.48350/177350

URI:

https://boris.unibe.ch/id/eprint/177350

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