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A fluorescently labeled undecapeptide derived from a protein in royal jelly of the honeybee—royalisin—for specific detection of oxidized low‐density lipoprotein
Author(s) -
Sato Akira,
Unuma Hiroto,
Yamazaki Yoji,
Ebina Keiichi
Publication year - 2018
Publication title -
journal of peptide science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 66
eISSN - 1099-1387
pISSN - 1075-2617
DOI - 10.1002/psc.3072
Subject(s) - chemistry , linker , peptide , fluorescein isothiocyanate , fluorescence , biochemistry , lysophosphatidylcholine , lipoprotein , ldl receptor , amino acid , isothiocyanate , phosphatidylcholine , low density lipoprotein , stereochemistry , microbiology and biotechnology , biology , cholesterol , phospholipid , physics , quantum mechanics , membrane , computer science , operating system
The probes for detection of oxidized low‐density lipoprotein (ox‐LDL) in plasma and in atherosclerotic plaques are expected to facilitate the diagnosis, prevention, and treatment of atherosclerosis. Recently, we have reported that a heptapeptide (Lys‐Trp‐Tyr‐Lys‐Asp‐Gly‐Asp, KP6) coupled through the ε‐amino group of N‐terminal Lys to fluorescein isothiocyanate (FITC), (FITC)KP6, can be useful as a fluorescent probe for specific detection of ox‐LDL. In the present study, to develop a novel fluorescent peptide for specific detection of ox‐LDL, we investigated the interaction (with ox‐LDL) of an undecapeptide corresponding to positions 41 to 51 of a potent antimicrobial protein (royalisin, which consists of 51 residues; from royal jelly of honeybees), conjugated at the N‐terminus to FITC in the presence of 6‐amino‐ n ‐caproic acid (AC) linker, (FITC‐AC)‐royalisin P11, which contains both sequences, Phe‐Lys‐Asp and Asp‐Lys‐Tyr, similar to Tyr‐Lys‐Asp in (FITC)KP6. The (FITC‐AC)‐royalisin P11 bound with high specificity to ox‐LDL in a dose‐dependent manner, through the binding to major lipid components in ox‐LDL (lysophosphatidylcholine and oxidized phosphatidylcholine). In contrast, a (FITC‐AC)‐shuffled royalisin P11 peptide, in which sequences Phe‐Lys‐Asp and Asp‐Lys‐Tyr were modified to Lys‐Phe‐Asp and Asp‐Tyr‐Lys, respectively, hardly bound to LDL and ox‐LDL. These findings strongly suggest that (FITC‐AC)‐royalisin P11 may be an effective fluorescent probe for specific detection of ox‐LDL and that royalisin from the royal jelly of honeybees may play a role in the treatment of atherosclerosis through the specific binding of the region at positions 41 to 51 to ox‐LDL.