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Fluorescent CD4 Probe for Potential HIV-1 gp120 Protein Detection

Fluorescent CD4 Probe for Potential HIV-1 gp120 Protein Detection

Zhongjie Wang, Poulami Talukder, Sidney M Hecht, Shengxi Chen

Bioorg Med Chem Lett. 2015 Mar 15;25(6):1182-5.

PMID: 25704889

Abstract:

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 260nm, energy was transferred from tryptophan to the Acd residue of mD1, and emitted fluorescence at 420nm. 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 420nm 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
IAR42414635	HIV-1 GP120 protein			Price

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