Team:UNICAMP-Brazil/Notebooks/September 12

(Difference between revisions)

Revision as of 10:48, 19 October 2009

Since all of our fragments are correctly digested, we started today the ligation of both finO and finP sequences to the vector pSB1A3. Each sequence was ligated singly to the vector and, only after each one is confirmed, we'll join then both to a single construction.
We performed the ligation finO+vector pSB1A3 for an O/N period, according to Protocol 11.

Marcelo

As we did for finO sequence, we also ligated finP to the vector pSB1A3 according to the same protocol. The ligation also lasted O/N period.

Marcelo

Today we realized again the PCR reaction to isolate the Cre-Recombinase without the ATG codon. The amplification was succesfully realized, being comproved with an 1% agarose gel run. The photo proves the amplification and the expected size of our fragment:

One of the recognition mechanisms of our project is based on conjugation. In our system, we will use a signal of the beginning of conjugation to stimulate the production of AI-2 in our E.coli. This signal will be a promoter which controls the expression of conjugation-related genes, named PY. (See project overview for more information).

However, before the construction of this system it is necessary to test the activation of the PY promoter and confirm if it is really activated in the beginning of the conjugation. Therefore we are going to do a test with this promoter. This test consists of constructing a device with this promoter and a RFP reporter, which will indicate when the PY promoter is activated.

We are going to use the 2 sizes of PY amplified from F plasmid: PY1 and PY2 and the part BBa_J23100, which has a promoter (that can be excised with XbaI and SpeI), a RBS, a RFP reporter gene and a terminator. So, we are going to digest the PY1 and PY2 fragments with XbaI and SpeI (the restriction sites of this 2 enzymes were added in the ends of our fragments by the amplification primers) and ligate both of them with BBa_J23100 (previously digested with XbaI and SpeI to remove its promoter).

Today we digested the PY1 and PY2 fragments that have been previously purified with the enzymes XbaI and SpeI. The digestion reaction lasted 3 hours.

Fabiana and Leonardo

E. coli transformed with the new biobricks grew very well on the LB+AMP plates!

Taís

@@ Line 25: / Line 25: @@
 ==== PY Promoter - PY1, PY2 and BBa_J23100 digestion ====
-*<p style=”text-align:justify;”>One of the recognition mechanisms of our project is based on conjugation. In our system, we will use a signal of the beginning of conjugation to stimulate the production of AI-2 in our E.coli. This signal will be a promoter which controls the expression of conjugation-related genes, named pY. (See project overview for more information).
+*<p style=”text-align:justify;”>One of the recognition mechanisms of our project is based on conjugation. In our system, we will use a signal of the beginning of conjugation to stimulate the production of AI-2 in our E.coli. This signal will be a promoter which controls the expression of conjugation-related genes, named PY. (See project overview for more information).
 *<p style=”text-align:justify;”>However, before the construction of this system it is necessary to test the activation of the PY promoter and confirm if it is really activated in the beginning of the conjugation. Therefore we are going to do a test with this promoter. This test consists of constructing a device with this promoter and a RFP reporter, which will indicate when the PY promoter is activated.