Interfacial properties and structure stability of the gp41 tryptophan-rich peptide from HIV-1.
The HIV-1 envelope glycoprotein 41 (gp41) undergoes large-scale conformational changes in order to induce the fusion of the virus and cell membranes. Thus, we investigated a possible structure transit at the air-water interface for the tryptophan-rich peptide of gp41 (gp41W). The synthetic peptide (KWASLWNWFNITNWLWYIK), corresponding to gp41W, shows interfacial properties on pure water and Tris buffer at pH 8.5. Isotherm measurements and Brewster angle microscopy (BAM) imaging showed that the behavior of the peptide monolayer was dependent on the subphase composition. A homogenous film was formed on buffer during the peptide monolayer compression, while the appearance of condensed domains on pure water could indicate the oligomerization of gp41W during the surface pressure increase. Polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) showed that, whatever the subphase, gp41W adopts an α-helix structure at the air-water interface and does not transit for any other structure even at high surface pressures.
Matar
Gladys
G
Université de Lyon, INSA de Lyon, CPE Lyon, CNRS UMR 5246 ICBMS, Lyon, Villeurbanne Cedex, France.
Nasir
Mehmet N
MN
Besson
Françoise
F
D000388:Air; D018360:Crystallography, X-Ray; D015700:HIV Envelope Protein gp41 / Q000737:chemistry*; D015497:HIV-1 / Q000737:chemistry*; D008958:Models, Molecular; D011312:Pressure; D011487:Protein Conformation; D013499:Surface Properties; D014867:Water / Q000737:chemistry
D015700:HIV Envelope Protein gp41; D014867:Water