Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 11, Issue 12, Pages 4864-4881Publisher
MDPI
DOI: 10.3390/ijms11124864
Keywords
aptamer; fumonisin B-1; mycotoxins; DNA; SELEX; toxins; maize; corn; binding affinity; molecular recognition
Funding
- Natural Sciences and Engineering Council of Canada (NSERC)
- Canadian Foundation for Innovation (CFI)
- Ontario Research Fund (ORF)
- National Research Council of Italy (CNR)
- Carleton University
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Fumonisins are mycotoxins produced by Fusarium verticillioides and F. proliferatum, fungi that are ubiquitous in corn (maize). Insect damage and some other environmental conditions result in the accumulation of fumonisins in corn-based products worldwide. Current methods of fumonisin detection rely on the use of immunoaffinity columns and high-performance liquid chromatography (HPLC). The use of aptamers offers a good alternative to the use of antibodies in fumonisin cleanup and detection due to lower costs and improved stability. Aptamers are single-stranded oligonucleotides that are selected using Systematic Evolution of Ligands by EXponential enrichment (SELEX) for their ability to bind to targets with high affinity and specificity. Sequences obtained after 18 rounds of SELEX were screened for their ability to bind to fumonisin B-1. Six unique sequences were obtained, each showing improved binding to fumonisin B-1 compared to controls. Sequence FB1 39 binds to fumonisin with a dissociation constant of 100 +/- 30 nM and shows potential for use in fumonisin biosensors and solid phase extraction columns.
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