Quantification of protein-lipid selectivity using FRET: Application of the M13 major coat protein

F. Fernandes, L.M.S. Loura, R.B.M. Koehorst, R.B. Spruijt, M.A. Hemminga, A. Federov, M. Prieto

Research output: Contribution to journalArticleAcademicpeer-review

33 Citations (Scopus)

Abstract

Quantification of lipid selectivity by membrane proteins has been previously addressed mainly from electron spin resonance studies. We present here a new methodology for quanti. cation of protein-lipid selectivity based on fluorescence resonance energy transfer. A mutant of M13 major coat protein was labeled with 7-diethylamino-3((4'iodoacetyl)amino)phenyl-4-methylcoumarin to be used as the donor in energy transfer studies. Phospholipids labeled with N-(7-nitro-2-1,3-benzoxadiazol-4-yl) were selected as the acceptors. The dependence of protein-lipid selectivity on both hydrophobic mismatch and headgroup family was determined. M13 major coat protein exhibited larger selectivity toward phospholipids which allow for a better hydrophobic matching. Increased selectivity was also observed for anionic phospholipids and the relative association constants agreed with the ones already presented in the literature and obtained through electron spin resonance studies. This result led us to conclude that fluorescence resonance energy transfer is a promising methodology in protein-lipid selectivity studies.
Original languageEnglish
Pages (from-to)344-352
Number of pages9
JournalBiophysical Journal
Volume87
DOIs
Publication statusPublished - 2004

Keywords

  • resonance energy-transfer
  • electron-spin-resonance
  • two-dimensional systems
  • model membranes
  • transbilayer distribution
  • biological-membranes
  • bacteriophage m13
  • escherichia-coli
  • fluorescence
  • bilayers

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