Cadmium/Heavy metals AND Gate

MAY

05/29/2012

Our group is in charge of building part of the “and” construction. We started analyzing if the plasmid we have with P4 actually had what we needed.

The plasmid PRMn25 contains the protein P4. It has Amp100 resistance and comes in Escherichia coli NFI. Cells were lysed to make sure the plasmid was present in these cells (5000bp). We ran a gel with 3 lysis, a sample from the plasmid PFRC54 (A3 promoter) and a sample of total DNA from the strain from which PFRC54 was obtained.

JUNE

05/31/2012

Plasmid PRMn25 was digested with SpeI and EcoRI. We do not have the sequence of the plasmid, but there seem to be several restriction sites for SpeI and just one site for EcoRI. The digestions were left for 4 hours and they were plused in the microwave 3 times, 10 seconds each time. Only Dulce’s digestion worked, even though it was the “dirtiest” sample.

06/06/2012

We repeated the lysis of PRMn25.
Digestions (20 µl)
H2O 12 µl
Enzime 1 µl
Buffer 10x 2 µl
Plasmid 5 µl
37ºC

PRMn25 was digested with EcoRi and BamHI. Since we don’t have the sequence we used these enzyme to confirm the restriction sites mentioned in Rojo et al. (1990). These sites were corroborated and the vector was linearized. We recycled the gel used for the PRMn25 lysis, which is why the gel seems out of phase.

06/08/12

The lysis worked so we transformed PRMn25 in DH5α. We performed a lysis on these cells to see if they had been transformed correctly with PRMn25.

We also transformed PFRC54. TRANSFORMATION PROTOCOL

06/11/12

We designed primers for our project. (Note from 07/10/12: we redesigned the primer for LasR, since the sequence was incorrect.)
OLIGOS 14/06/12
LASR
UPPER 5'-3'
PREFIX+RBS+SPACER+LASR
GTTTCTTCGAATTCGCGGCCGCTTCTAGAG AAAGGTGGTGAA TACTAG ATGGCATTAGTAGAT
LOWER 5'-3'
SUFIX+LASR
GTTTCTTCCTGCAGCGGCCGCTACTAGTATTATTA TCATAATGTAATTAA

P4 5'-3'
PREFIX+RBS+SPACER+P4
upper
GTTTCTTCGAATTCGCGGCCGCTTCTAGAG AAAGGTGGTGAA TACTAG ATGCCTAAAACACAA
SUFIX+P4
lower 5'-3'
GTTTCTTCCTGCAGCGGCCGCTACTAGTATTATTA CTACACCATACTTTT


A3 (PROMOTER)
UPPER 5'-3'
PREFIX+A3
5' GTTTCTTCGAATTCGCGGCCGCTTCTAGAG taactttttgcaaga 3'
LOWER 5'-3'
SUFIX+A3
5'GTTTCTTCCTGCAGCGGCCGCTACTAGTA ctacttaattatacc 3'


RFP
UPPER 5'-3'
PREFIX+RBS+SPACER+RFP
GTTTCTTCGAATTCGCGGCCGCTTCTAGAG AAAGGTGGTGAA TACTAG ATGGCTTCCTCCGAA
LOWER 5'-3'
SUFIX+RFP
GTTTCTTCCTGCAGCGGCCGCTACTAGTA TTATTAAGCACCGGT

GUSA
UPPER 5'-3'
PREFIX+RBS+SPACER+GUSA
GTTTCTTCGAATTCGCGGCCGCTTCTAGAG AAAGGTGGTGAA TACTAG atgttacgtcctgta
LOWER 5'-3'
SUFIX+GUSA
GTTTCTTCCTGCAGCGGCCGCTACTAGTATTATTA tcattgtttgcctcc


ARAC without LVA (version 2 registry part: BBa_C0080)
UPPER 5'-3'
PREFIX+RBS+SPACER+ARAC
GTTTCTTCGAATTCGCGGCCGCTTCTAGAG AAAGGTGGTGAA TACTAG ATGGCTGAAGCGCAA
LOWER 5'-3'
SUFIX+ARAC
GTTTCTTCCTGCAGCGGCCGCTACTAGTATTATTA CAACTTGACGGCTAC

06/14/2012

We obtained the terminator from the 2012 distribution (plate 2 24C) and we transformed the DNA in DH5. The terminator (BBa_B0014) comes in the PSBIAK3 plasmid with resistance to Amp and Km. The RFP (BBa_E1010) comes in the plasmid PSBI2K3 with resistance to Amp and we obtained it from the 2012 distribution plate 2 (17E). We obtained the purified plasmid of the RFP from the AraC AND team. (Diego, Jonathan, and Abiel).

06/15/12

Due to the failed digestions, we did the RFP and terminator lysis again.
The AraC team has the terminator plasmid purified, we are thinking of using that one.

06/18/12

We used the RFP that we transformed and the RFP that the AraC team did as a positive control. The terminator still looks strange, since we can’t observe supercoling which is normally observed.

We are waiting for our primers, and the team will be going to a math modeling course for a week.

JULY

07/02/12

We did 2 PCRs, since the primers have arrived. We purified by miniprep RFP and P4. With this PCR we will add the prefix (EcoRI and XbaI) and RBS to the beginning of the sequence, and suffix (restiction sites for SpeI asn PstI).
RFP, P4 PCR PROTOCOL
TM’s
RFP UP 78ºC
RFP LW 75.5 ºC
P4 UP 73.6 ºC
P4 LW 73.9ºC
Taking into account both TM’s, we used the same amplification program for both, thermocycle B progam iGEM.
We ran a gel and we observed fragments that correspond to the RFP and P4, we can also observe other fragments which means we will have to purify the bands.

07/03/12

We used Roche kit for band purification.

The P4 purification turned out slightly dirty and the RFP turned out completely dirty. We repeated the purifications by loading the previously “purified” sample and repeating the procedure.

07/04/2012

We repeated the gel where we checked the re-purification, and indeed we need to repeat P4’s PCR.

The PCR worked, but a band purification will be needed. We fused all of the PCR product and loaded it.

We grew bacterial culture in antibiotics for LasR lysis.

Rfp+terminator ligation LIGATION PROTOCOL