Volume 129, Issue 28 pp. 8338-8342
Zuschrift

Exploiting Benzophenone Photoreactivity To Probe the Phospholipid Environment and Insertion Depth of the Cell-Penetrating Peptide Penetratin in Model Membranes

Dr. Chen-Yu Jiao

Dr. Chen-Yu Jiao

Department of Chemistry, Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM), 4 place Jussieu, 75005 Paris, France

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Dr. Emmanuelle Sachon

Dr. Emmanuelle Sachon

Department of Chemistry, Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM), 4 place Jussieu, 75005 Paris, France

Sorbonne Universités, Plateforme de Spectrométrie de Masse et Protéomique, IBPS, FRE3631, 7–9 quai St Bernard, 75005 Paris, France

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Dr. Isabel D. Alves

Dr. Isabel D. Alves

Department of Chemistry, Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM), 4 place Jussieu, 75005 Paris, France

Present address: Chemistry and Biology of Membranes and Nanoobjects, University of Bordeaux, Bat. B14, allée Geoffroy St Hilaire, 33600 Pessac, France

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Dr. Gérard Chassaing

Dr. Gérard Chassaing

Department of Chemistry, Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM), 4 place Jussieu, 75005 Paris, France

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Dr. Gérard Bolbach

Dr. Gérard Bolbach

Department of Chemistry, Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM), 4 place Jussieu, 75005 Paris, France

Sorbonne Universités, Plateforme de Spectrométrie de Masse et Protéomique, IBPS, FRE3631, 7–9 quai St Bernard, 75005 Paris, France

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Dr. Sandrine Sagan

Corresponding Author

Dr. Sandrine Sagan

Department of Chemistry, Sorbonne Universités, UPMC Univ Paris 06, PSL Research University, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolécules (LBM), 4 place Jussieu, 75005 Paris, France

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First published: 09 May 2017
Citations: 1

Abstract

Penetratin (RQIKIWFQNRRMKWKK) enters cells by different mechanisms, including membrane translocation, thus implying that the peptide interacts with the lipid bilayer. Penetratin also crosses the membrane of artificial vesicles, depending on their phospholipid content. To evaluate the phospholipid preference of penetratin, as the first step of translocation, we exploited the benzophenone triplet kinetics of hydrogen abstraction, which is slower for secondary than for allylic hydrogen atoms. By using multilamellar vesicles of varying phospholipid content, we identified and characterized the cross-linked products by MALDI-TOF mass spectrometry. Penetratin showed a preference for negatively charged (vs. zwitterionic) polar heads, and for unsaturated (vs. saturated) and short (vs. long) saturated phospholipids. Our study highlights the potential of using benzophenone to probe the environment and insertion depth of membranotropic peptides in membranes.

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