title: Detection of highly curved membrane surfaces using a cyclic peptide derived from synaptotagmin-I.
abstract: The generation of highly curved membranes is essential to cell growth, division, and movement. Recent research in the field is focused to answer questions related to the consequences of changes in the topology of the membrane once it is created, broadly termed as membrane curvature sensing. Most probes that are used to study curvature sensing are intact membrane active proteins such as DP1/Yop1p, ArfGAP1, BAR domains, and Synaptotagmin-I (Syt1). Taking a cue from nature, we created the cyclic peptide C2BL3C based on the membrane penetration C2B loop 3 of Syt1 via "Click" chemistry. Using a combination of spectroscopic techniques, we investigated the peptide-lipid interactions of this peptide with synthetic phospholipid vesicles and exosomes from rat blood plasma. We found that the macrocycle peptide probe was selective for lipid vesicles with highly curved surfaces (d < 100 nm). These results suggested that C2BL3C functions as a selective detector of highly curved phospholipid bilayers.
authors: Department of Chemistry and Biochemistry and BioFrontiers Institute, University of Colorado Boulder, Boulder, Colorado 80309, United States.
authors: Jonel P
authors: JP
authors: Saludes
authors: Leslie A
authors: LA
authors: Morton
authors: Nilanjan
authors: N
authors: Ghosh
authors: Lida A
authors: LA
authors: Beninson
authors: Edwin R
authors: ER
authors: Chapman
authors: Monika
authors: M
authors: Fleshner
authors: Hang
authors: H
authors: Yin
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D055354:Exosomes; D008081:Liposomes / Q000737:chemistry; D008567:Membranes, Artificial; D008969:Molecular Sequence Data; D053758:Nanoparticles; D010456:Peptides, Cyclic / Q000737:chemistry*; D051381:Rats; D017550:Spectroscopy, Fourier Transform Infrared; D050863:Synaptotagmin I / Q000737:chemistry*
chemical_list: D008081:Liposomes; D008567:Membranes, Artificial; D010456:Peptides, Cyclic; D050863:Synaptotagmin I