Conformational studies of peptides representing a segment of TM7 from Vo-H+-V-ATPase in SDS micelles

A.M. Duarte, E.R. de Jong, R.B.M. Koehorst, M.A. Hemminga

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

The conformation of a transmembrane peptide, sMTM7, encompassing the cytoplasmic hemi-channel domain of the seventh transmembrane section of subunit a from V-ATPase from Saccharomyces cerevisiae solubilized in SDS solutions was studied by circular dichroism (CD) spectroscopy and fluorescence spectroscopy of the single tryptophan residue of this peptide. The results show that the peptide adopts an alpha-helical conformation or aggregated beta-sheet depending on the peptide-to-SDS ratio used. The results are compared with published data about a longer version of the peptide (i.e., MTM7). It is concluded that the bulky, positively charged arginine residue located in the center of both peptides has a destabilizing effect on the helical conformation of the SDS-solubilized peptides, leading to beta-sheet formation and subsequent aggregation.
Original languageEnglish
Pages (from-to)639-646
JournalEuropean Biophysics Journal
Volume39
Issue number4
DOIs
Publication statusPublished - 2010

Keywords

  • major coat protein
  • proton translocation channel
  • 5th transmembrane segment
  • dodecyl-sulfate micelles
  • membrane-proteins
  • escherichia-coli
  • nmr
  • bacteriophage-m13
  • mimicking
  • detergent

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