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2014 ; 207
(ä): 223-39
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Comparison between the behavior of different hydrophobic peptides allowing
membrane anchoring of proteins
#MMPMID24560216
Lhor M
; Bernier SC
; Horchani H
; Bussières S
; Cantin L
; Desbat B
; Salesse C
Adv Colloid Interface Sci
2014[May]; 207
(ä): 223-39
PMID24560216
show ga
Membrane binding of proteins such as short chain dehydrogenase reductases or
tail-anchored proteins relies on their N- and/or C-terminal hydrophobic
transmembrane segment. In this review, we propose guidelines to characterize such
hydrophobic peptide segments using spectroscopic and biophysical measurements.
The secondary structure content of the C-terminal peptides of retinol
dehydrogenase 8, RGS9-1 anchor protein, lecithin retinol acyl transferase, and of
the N-terminal peptide of retinol dehydrogenase 11 has been deduced by prediction
tools from their primary sequence as well as by using infrared or circular
dichroism analyses. Depending on the solvent and the solubilization method,
significant structural differences were observed, often involving ?-helices. The
helical structure of these peptides was found to be consistent with their
presumed membrane binding. Langmuir monolayers have been used as membrane models
to study lipid-peptide interactions. The values of maximum insertion pressure
obtained for all peptides using a monolayer of
1,2-dioleoyl-sn-glycero-3-phospho-ethanolamine (DOPE) are larger than the
estimated lateral pressure of membranes, thus suggesting that they bind
membranes. Polarization modulation infrared reflection absorption spectroscopy
has been used to determine the structure and orientation of these peptides in the
absence and in the presence of a DOPE monolayer. This lipid induced an increase
or a decrease in the organization of the peptide secondary structure. Further
measurements are necessary using other lipids to better understand the membrane
interactions of these peptides.