Part:BBa_K3798006

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_K3798006 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 5 shows a binding efficacy of about 62%, although it seems like a high binding efficiency, it do not satisfies the safe limit of concentration of the silver ions. Therefore, this aptamer is discarded and was subjected for further examination.

Reference

1. Lin, Z., Li, X., & Kraatz, H. (2011). Impedimetric Immobilized DNA-Based Sensor for Simultaneous Detection of Pb2+, Ag+, and Hg2+. Analytical Chemistry, 83(17), 6896-6901. doi: 10.1021/ac2014096