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2014 ; 36
(9
): 1863-8
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Ultrasensitive immuno-detection using viral nanoparticles with modular assembly
using genetically-directed biotinylation
#MMPMID24930095
Litvinov J
; Hagström AE
; Lopez Y
; Adhikari M
; Kourentzi K
; Strych U
; Monzon FA
; Foster W
; Cagle PT
; Willson RC
Biotechnol Lett
2014[Sep]; 36
(9
): 1863-8
PMID24930095
show ga
We report a novel, modular approach to immuno-detection based on antibody
recognition and PCR read-out that employs antibody-conjugated bacteriophage and
easily-manipulated non-pathogenic viruses as affinity agents. Our platform
employs phage genetically tagged for in vivo biotinylation during phage
maturation that can easily be linked, through avidin, to any biotinylated
affinity agent, including full-length antibodies, peptides, lectins or aptamers.
The presence of analyte is reported with high sensitivity through real-time PCR.
This approach avoids the need to clone antibody-encoding DNA fragments, allows
the use of full-length, high affinity antibodies and, by having DNA reporters
naturally encapsulated inside the bacteriophage, greatly reduces nonspecific
binding of DNA. We validate the efficacy of this new approach through the
detection of Vascular Endothelial Growth Factor, a known angiogenic cancer
biomarker protein, at attomolar concentrations in bronchoalveolar lavage fluid.