Revision as of 14:51, 20 September 2015

ATP Aptamer Spinach 2.1

The ATP Aptamer Spinach2.1 is the first fluorescent ATP sensor that was designed for the in vitro transcription tool box designed by the iGEM Team Heidelberg 2015. This ATP Aptamer Spinach2.1 is cloned into the RFC 110.

Usage and Biology

ATP Aptamer Spinach 2.1 is a fusion of the BBa_K1330000 generated by DTU Danemark. According to our results, this fusion should contain the same properties as BBa_K1614012. Yet, this Spinach 2.1 is ligand dependend to ATP and should find its use in the detection of the small molecule ATP. Applications such as nucleotide sensing during in vitro transcription are possible.

=Proporties of the ATP Aptamer Spinach2

In our project we generated new biobricks. The first one (BBa_K1614012) contains a Spinach2 aptamer that was fused to the ATP Aptamer. This device was applied to detect the small molecule ATP during in vitro reactions such as in vitro transcription. This BioBrick is the first fluorescent ATP sensor. Experiments have shown that the ATP Aptamer Spinach2 is able to detect ATP and can even sense dynamic changes in ATP concentration during biochemical reactions like in vitro transcriptions. Compared to the other ATP Aptamer Spinach2 variations the ATP Aptamer Spinach2 has the lowest fluorescence shown in the spectrum. Even though the ATP Aptamer Spinach2 was tested during the in vitro transcription reaction, it showed less sensitivity than the ATP Aptamer JAWS1 Spinach2.

Establishment of a system to sense small molecule using the Spinach2 Aptamer. (A)</b> Emission spectrum of the original Spinach2 Aptamer, which was applied as an internal control. (B) As another internal control, we reproduce the data for the c-di-GMP Spinach2 system, published by Kellenberger et al.. Indeed, highest fluorescence maximum for the c-di-GMP Spinach2 system was measured in presence of the ligand. (C) Analysis of the fluorescent properties of our ATP Aptamer Spinach2 constructs. The Spinach2 containing the Szostak ATP Aptamer shows the lowest fluorescence of all three ATP Aptamer Spinach2 variations. The JAWS-generated ATP AptamerJAWS1 Spinach2 and the ATP AptamerJAWS2 Spinach2 show higher fluorescence maxima in presence of ATP.

Sequence and Features