Homogenous M13 bacteriophage quantification assay using switchable lanthanide fluorescence probes

Homogenous M13 bacteriophage quantification assay using switchable lanthanide fluorescence probes.

We have developed a rapid and reliable bacteriophage quantification method based on measurement of phage single-stranded DNA (ssDNA) using switchable lanthanide chelate complementation probes. One oligonucleotide probe contains a non-fluorescent lanthanide ion carrier chelate and another probe is labeled with a light absorbing antenna ligand. Hybridization of the non-fluorescent complementation...

Time-Resolved Fluorescence of Lanthanide Probes and Applications in Biotechnology

Cell-specific targeting by engineered M13 bacteriophage expressing VEGFR2 nanobody

Objective(s): Filamentous bacteriophage M13 was genetically engineered to specifically target mammalian cells for gene delivery purpose. Materials and Methods: A vascular endothelial growth factor receptor 2 (VEGFR2)-specific nanobody was genetically fused to the capsid gene III of M13 bacteriophage (pHEN4/3VGR19). A mammalian expression construct containing Cop-green fluorescent protein (Cop-G...

Dual-label detection of amplified products in quantitative RT-PCR assay using lanthanide-labeled probes.

Quantitative RT-PCR (QRT-PCR) enables the sensitive and specific detection of mRNA with a small copy number. We used the QRT-PCR method and dual-label analysis of amplification products for the detection of prostate-specific antigen (PSA) mRNA. The QRT-PCR assay employed a PSA-like internal standard (IS) mRNA, which was used to quantify the PSA mRNA copies and to control the variations during t...

Lanthanide-based Probes

■ Abstract Using luminescent lanthanides, instead of conventional fluorophores, as donor molecules in resonance energy transfer measurements offers many technical advantages and opens up a wide range of new applications. Advantages include farther measurable distances (∼100 Å) with greater accuracy, insensitivity to incomplete labeling, and the ability to use generic relatively large labels, wh...