Part:BBa_K3798008

ssDNA, an aptamer for Ag+ ion

Silver is one of the most wasted precious metals that can be found in effluents, streams and even food. As our project is to develop a precious metal recycling platform, we chose Ag+ as the demonstration ion of this phase of the project. Aptamers are oligonucleotides that can bind targeted molecules with its secondary structures, in our project, Ag+ ion. BBa_K3798008 is a Ag+ aptamer obtained from a previous paper[1].

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]

Binding efficiency and stability

Fig.1 Remaining Ag+ ion concentration of the solution after treated by different types of aptamers.

Aptamer 7 shows a binding efficacy of about 90%, although it seems like a high binding efficiency and satisfies the safe limit of concentration of the silver ions, it is not as stable nor efficient as Aptamer 4. Therefore, this aptamer is discarded and was not subjected for further examination.

Reference

1. He, X., Qing, Z., Wang, K., Zou, Z., Shi, H., & Huang, J. (2012). Engineering a unimolecular multifunctional DNA probe for analysis of Hg2+ and Ag+. Analytical Methods, 4(2), 345. doi: 10.1039/c2ay05823e