ISSN:
1573-4943
Keywords:
LDL
;
apo B-100
;
synthetic peptide
;
ATR-FTIR
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Peptides corresponding to lipid binding domains of Apo B-100 were synthesized, purified, and incubated with dimyristoylphosphatidylcholine (DMPC) liposomes. The secondary structure of the apo B-100 peptide-lipid complexes was evaluated by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). Those peptides belonging to the hydrophobic “core” domain of apo B-100 when associated with phospholipids were rich inΒ sheet structure; a predominantα helical conformation was shown to be associated with one peptide located in a surface region of apo B-100. IR dichroic spectra revealed, in the case of the “core” peptides, that theΒ sheet component is the only oriented structure with respect to the phospholipid acyl chains. This orientation of theΒ sheet was recently found in LDL particles after proteolytic digestion by trypsin (Goormaghtigh, E., Cabiaux, V., De Meutter, J., Rosseneu, M., and Ruysschaert, J. M., 1993,Biochemistry 32, 6104–6110). Altogether, the data suggest thatΒ sheet, present in a high proportion in the native apo B-100, is probably another protein structure in addition to the amphipathic helix which strongly interacts with the lipid outer layer surrounding the LDL particle.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01891995
