Abstract
A novel ssDNA aptamer (P38), with a 40 mer random region flanked by primer-binding sites on both sides, targeting Plasmodium falciparum lactate dehydrogenase (PfLDH) has been developed through systematic evolution of ligands by exponential enrichment (SELEX), including counter SELEX against human lactate dehydrogenase A and B (hLDH A and B). The 2D structure of P38 shows the presence of three stem loops with a δG of −9.18 kcal/mol. EMSA studies on P38 complexes with the increasing concentration of PfLDH revealed a dissociation constant of 0.35 µM. P38 has been exploited for the quantitative detection of PfLDH using cationic surfactant-mediated aggregation of gold nanoparticles (16-nm diameter) as an optical probe. Among the three different cationic surfactants, characterized by different hydrocarbon tail groups, benzalkonium chloride (BCK) was found to be most efficient with a limit of detection of 281 ± 11 pM. This BCK-based approach with the novel highly selective aptamer provides simple and sensitive detection of PfLDH in the clinically relevant range.
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Abbreviations
- PfLDH:
-
Plasmodium falciparum lactate dehydrogenase
- BCK:
-
Benzalkonium chloride
- CTAB:
-
Cetyltrimethyl ammonium bromide
- DDAB:
-
Didodecyl dimethyl ammonium bromide
- AuNP:
-
Gold nanoparticle
- TEM:
-
Transmission electron microscopy
- ELISA:
-
Enzyme linked immunosorbent assay
- PCR:
-
Polymerase chain reaction
- RDT:
-
Rapid diagnostic test
- SELEX:
-
Systematic evolution of ligands by exponential enrichment
- EMSA:
-
Electrophoretic mobility shift assay
- hLDH A:
-
Human lactate dehydrogenase chain A
- hLDH B:
-
Human lactate dehydrogenase chain B
- S20,w :
-
Sedimentation coefficient corrected for the viscosity and density of the solvent relative to that of water at 20 °C
- LOD:
-
Limit of detection
- RT:
-
Room temperature
- NAD:
-
Nicotinamide adenine dinucleotide
- APAD:
-
3-Acetylpyridine adenine dinucleotide
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Acknowledgments
We acknowledge the financial assistance of the Department of Biotechnology, India. We thank Dr. J. Mahanta and Dr. P. K. Mohapatra from the Regional medical research centre, ICMR, Dibrugarh for providing the blood spots.
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Jain, P., Chakma, B., Singh, N.K. et al. Aromatic Surfactant as Aggregating Agent for Aptamer-Gold Nanoparticle-Based Detection of Plasmodium Lactate Dehydrogenase. Mol Biotechnol 58, 497–508 (2016). https://doi.org/10.1007/s12033-016-9946-x
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DOI: https://doi.org/10.1007/s12033-016-9946-x