Fluorescent Dyes as Probes to Study Lipid-Binding Proteins

Alexander V. Pastukhov, Ira J. Ropson

Research output: Contribution to journalArticle

38 Scopus citations


We studied the equilibrium binding of two hydrophobic fluorescent dyes, ANS and bisANS, to four members of a family of intracellular lipid-binding proteins: IFABP, CRABP I, CRABP II, and ILBP. The spectral and binding parameters for the probes bound to the proteins were determined. Typically, there was a single binding site on each protein for the ligands. However, IFABP cooperatively bound a second bisANS molecule in the binding pocket. Comparative analysis of affinities and spectral characteristics for the two probes allowed us to examine the contributions of electrostatic and hydrophobic interactions to the binding process, and to address some aspects of the internal structure of the studied proteins.

Original languageEnglish (US)
Pages (from-to)607-615
Number of pages9
JournalProteins: Structure, Function and Genetics
Issue number3
Publication statusPublished - Nov 15 2003


All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Biochemistry
  • Molecular Biology

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