BBa_K1824559 1 BBa_K1824559 RNA Thermometer FourU (Specially designed for J23119) 2015-09-04T11:00:00Z 2015-09-05T09:42:31Z FourU was previously submitted by TuDelft 2008. This is a specially designed A1 RNA thermometer that with a unique spacer at the front, which would make it compatible with pBAD BBa_I13453. A1 RNA thermometer have the hairpin structure that harbors the Shine-Dalgarno sequence (SD sequence) and, in this way, make it inaccessible to the 30S unit of the bacterial ribosome, resulting in translational inactivation (Figure 2). The melting temperature of this RNA thermometer is 37 Celsius degree. Once reaching the melting temperature, hairpin structure would vanish and as a result, exposing the SD sequence to trigger the translation process. Different promoters have their own transcription start sites and, in most cases, + 1 sites are embedded in promoter sequence. Hence, it is normal that transcribed RNA usually carry part of promoter sequence. However, for regulatory parts like RNA thermometer, truncation or alteration of the RNA sequence could be destructive. Hence, special designed RNA spacer between transcribed part of promoters and RNA thermometers are important for maintaining the secondary structure of RNA thermometer. For pBAD BBa_I13453, transcription starts at TCTCCATA (transcription start site indicated in bold). Based on this, BBa_K1824557 was specially designed with a spacer that had less probability to interact with the functional structure of RNA thermometer. The possible secondary structure of A1 was simulated by RNAstructure (Fig.1). For testing results of pBAD-A1, See BBa_K1824003. false false _2250_ 25962 25962 9 false To maintain the secondary structure of RNA thermometers, researchers need to be careful with of the use of any parts that couple with it. For instance, in some cases, part of operator region can be transcribed into RNAs and form tight secondary structure and thus interfere RNA thermometers. false Wenbo Xu BBa_K1824559_sequence 1 tactagagggacaagcaatgcttgccttgaatagtaacttttgaatagtgattcaggaggtactag igem2sbol 1 iGEM to SBOL conversion Conversion of the iGEM parts registry to SBOL2.1 Chris J. Myers James Alastair McLaughlin 2017-03-06T15:00:00.000Z