Part:BBa_K4613003

Molecular Beacon

Molecular beacon usually formed a double fluorophore-labeled and quencher-labeled dual-strand structure.Through DNA hybridization, resulting in F-Q proximity and concomitant fluorescence quenching of the fluorophore. When the target specifically binds to fluorophore (F), quencher (Q) is released and the fluorescence intensity increases. We chose a single-strand oligonucleotide, which combined with a fluorophore (F) and a quencher (Q), as our molecular beacon. When the rolling circle amplification (RCA) was triggered and the long single DNA strands with repeated sequences were produced, the molecular beacon would hybridize with the RCA product and molecular beacon probes open, resulting in a target-specific RCA-amplified increase of fluorescence intensity. Due to its simple signal transduction, high sensitivity, easy operation and fast response, we chose molecular beacon as our fluorescent aptasensors.

Fig.1 The principle of rolling circle amplification(RCA) induced molecular beacon probes open and increase of fluorescence intensity.

Reference

1. Xu G, Zhao J, Yu H, et al. Structural insights into the mechanism of high-affinity binding of ochratoxin A by a DNA aptamer[J]. Journal of the American Chemical Society, 2022, 144(17): 7731-7740.
2. Zhang J, Lu Y, Gao W, et al. Structure-switching locked hairpin triggered rolling circle amplification for ochratoxin A (OTA) detection by ICP-MS[J]. Microchemical Journal, 2023, 186: 108365.

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  COMPATIBLE WITH RFC[12]
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]