Fluorescent CD4 probe for potential HIV-1 gp120 protein detection

Zhongjie Wang, Poulami Talukder, Sidney Hecht, Shengxi Chen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A fluorescently modified CD4 domain 1 (mD1) protein has been designed and elaborated in an in vitro expression system. This fluorescent probe contains a Förster resonance energy transfer (FRET) pair, which uses a tryptophan residue as the fluorescence donor and an acridon-2-ylalanine (Acd) as the acceptor. When excited at 260 nm, energy was transferred from tryptophan to the Acd residue of mD1, and emitted fluorescence at 420 nm. This fluoresence was quenched after Evans blue (EB) inhibitor or HIV-1 gp120 protein binding, presumably as a consequence of changes in the distance and dipole orientation between the donor and acceptor; the emission intensity at 420 nm decreased in a concentration-dependent fashion. This fluorescent CD4 probe could be developed into a novel tool for HIV-1 gp120 protein detection. It also could be used to screen small molecules that inhibit the gp120-CD4 interaction.

Original languageEnglish (US)
Pages (from-to)1182-1185
Number of pages4
JournalBioorganic and Medicinal Chemistry Letters
Issue number6
StatePublished - Mar 15 2015


  • Acridon-2-ylalanine
  • FRET
  • Fluorescent CD4
  • HIV detection
  • gp120

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry


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