Team:Peking R/Notebook/HSY

I am responsible for establishing RNA controllers which recognize theophylline as a desired ligand. Furthermore, I test and optimize various kinds of RNA controllers' responses in regulating gene expression.

Up to 7.3
1.Positive transformation of the standard parts from the 2011 distribution kit.
2.Pick up three to five clones of each plate and incubate at 37℃ to amplify the bacteria. Use NanoDrop to measure the concentration of miniprep products.
3.Measure the growth curve of E.coli DH5α in LB liquid medium without any antibiotics.
4.Prepare for getting a tandem part of B0015-B0025. Access 50μl reaction system to double digest B0015 and B0025 separately. Unfortunately, electrophoresis enzyme digestive product of B0015 does not result in objective stripes. Low efficiency of gel extraction of B0025 digestive product.
5.Prepare for getting a tandem part of E0240-B0025 or E0840-B0025. Access 50μl reaction system to double digest E0240, E0840 and B0025 respectively.
6.PCR primer design.

7.4-7.10
1. Taq DNA polymerase PCR to get;Promoter-1/2riboswitch/ribozyme” and “1/2riboswitch/ribozyme-Terminator” sequence respectively. PCR products are designed to conduct bluntend ligation. However, Taq-PCR products contain poly A. Klenow should be used to digest the poly A.
2. “Promoter-1/2riboswitch/ribozyme” and “1/2riboswitch/ribozyme-Terminator” sequence digest of double enzymes, and then link with backbone pSB1K3. Change the resistance of backbone from ampicillin to kanamycin can avoid false positives.
3. Use high fidelity pfu DNA polymerase to get PCR products for linking without poly A.
4. Prepare theophylline solution. According to its solubility in H2O, 10mM theophylline aqua and 10mM theophylline LB liquid medium are available.

7.11-7.17
1. Measure the growth curve of E.coli DH5α in LB liquid medium without any antibiotics.
2. Pick up three to five clones of each plate which contains designed measurements. Send to sequencing.  
3. Prepare pSB1K3, pSB1A3 and pSB1C3 as backbones for parts ligation. Digest backbones of double enzymes.
4. Use Mutation Kit to get PCR products without poly A.
5. Design ”Terminator-Promoter” part. PCR to get promoter J13453(pBAD), then digest of XbaI and PstI. Link the segment with B0015 which has been digested of SpeI and PstI.

7.18-7.25
1. Try new method to get designed RNA controllers. Pick up several clones of each plate, then PCR or double digestion and agarose gel electrophoresis to test the preliminary correctness of sequence.
2. Measure the ligand responsive curve of theophylline hammerhead ribozyme designed by MU Tong with a theophylline gradient. Take GFP fluorescence intensity as gene expression intensity. Add theophylline before the inducer.
3. Design new primers to get original RNA controller N8.3.
4. Sequencing result of “Terminator-Promoter” part is negative.
5. Send inocula of designed theophylline responsive riboswitch measurements to sequencing.

7.26-8.4
1. Get positive results of three theophylline responsive riboswitch measurements----1G1, 1G2 and 1G3. They both consist of pBAD, riboswitch and E0840.
2. Measure the ligand responsive curve of 1G1, 1G2 and 1G3 with a theophylline gradient. 1G1 shows the best performance.
3. Design and receive the primers of 1G1 fuse 36bp of C1434.
4. PCR to obtain N8.3 and 1G1-C1.

8.14-8.20
1. Get positive results of N8-3.
2. Measure the ligand responsive curve of N8-3 with a theophylline gradient.
3. Measure the ligand responsive curve of three groups of simultaneous 1G1 inocula with a theophylline gradient. Record OD600nm when add the inducer.
4. Measure the ligand responsive curve of TPP hammerhead ribozyme designed by ZHAO Yangyang with a TPP gradient.
5. Measure the ligand responsive curve of AND GATE-1G1 with a theophylline gradient. Arabinose and salicylic acid are inducers.

8.21-8.30
1. Measure the ligand responsive curve of modified TPP hammerhead ribozyme with a TPP gradient.
2. Measure the ligand responsive curve of AND GATE-1G1 with a theophylline gradient. Arabinose and salicylic acid are inducers.
3. Design and receive the primers of parental 1G1.
4. Use mutation kit to get parental 1G1. Take 1G1 which was assembled in pSB1K3 as template.
5. Mutate the RBS of AND GATE.

8.31-9.7
1. Design primers to obtain solely original RBS of N8.3. Design primers to obtain solely original RBS of parental 1G1.
2. Positive results of 1G1-C1, P1G1, P1G1-OR, N8.3 and N8.3-OR.
3. Measure the ligand responsive curve of parental 1G1 with a theophylline gradient. Record OD600nm when add the inducer.
4. Measure the ligand responsive curve of 1G1-C1 with a theophylline gradient. Record OD600nm when add the inducer.

9.8-9.15
1. Measure the ligand responsive curve of P1G1-OR and N8.3-OR with a theophylline gradient. Record OD600nm when add the inducer.
2. Alert backbone from pSB1K3 to pSB1C3 for part submission. Digest pSB1C3 with E.coRI and PstI. Digest designed parts which are assembled in pSB1K3 with E.coRI and PstI. Link the segments and transform.
3. Send inocula to sequencing.
4. Design primers to obtain sole RNA controllers which are expected inserted in pSB1C3.

9.16-9.23
1. Positive results of 1G1, P1G1, P1G1-OR, N8.3 and N8.3-OR assembled in pSB1C3.