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Published on: February 28, 2015
Size-dependent PCR inhibitory effect induced by gold nanoparticles
Weijie Wan1, John T W Yeow, Michele I Van Dyke
1Department of Systems Design Engineering, University of Waterloo, Waterloo, ON N2L3G1, Canada.
Summary
Gold nanoparticles (AuNPs) can inhibit PCR efficiency at higher concentrations by interacting with Taq polymerase. However, bovine serum albumin (BSA) can reverse this inhibition, improving PCR results.
Area of Science:
- Biochemistry
- Nanotechnology
- Molecular Biology
Background:
- Gold nanoparticles (AuNPs) are increasingly used in biological applications.
- Polymerase Chain Reaction (PCR) is a fundamental technique in molecular biology.
- Understanding nanoparticle-biomolecule interactions is crucial for optimizing assays.
Purpose of the Study:
- To investigate the impact of varying gold nanoparticle sizes and concentrations on PCR efficiency.
- To elucidate the mechanism behind gold nanoparticle-induced PCR inhibition.
- To explore methods for mitigating the inhibitory effects of gold nanoparticles on PCR.
Main Methods:
- Real-time PCR was performed using gold nanoparticles (5, 10, and 20 nm) at different concentrations.
- Interactions between gold nanoparticles and Taq polymerase were analyzed.
- The effect of bovine serum albumin (BSA) on gold nanoparticle-mediated PCR inhibition was assessed.
Main Results:
- Gold nanoparticles showed no significant effect on PCR at low concentrations.
- Increased gold nanoparticle concentrations led to PCR inhibition, with size-dependent effects observed.
- Taq polymerase was found to interact with gold nanoparticles, reducing free polymerase concentration.
- Bovine serum albumin (BSA) interacted with gold nanoparticles, blocking polymerase binding sites and reversing inhibition.
Conclusions:
- Gold nanoparticle concentration and size influence PCR efficiency.
- Taq polymerase interaction with AuNPs is a key mechanism for PCR inhibition.
- BSA can effectively counteract gold nanoparticle-induced PCR inhibition, offering a strategy for assay optimization.
