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From 2014.igem.org

BYU 2014 Notebook Edit September October

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2 September 2014

Alpha Amylase: Based off the sequencing results from the latest round of colony PCR of alpha amylase, it looks like colony 3 contained a mutated PstI restriction site. From the streak plate and overnight was started. (JB)

3 September 2014

Alpha Amylase: Performed a plasmid prep of the colony 3 mutant following the SpinSmart High-copy plasmid purification. I took the prep and measured the plasmid concentration by nano drop and it only read around 20 ng/uL. This is definitely too low to get any sequencing from. I started a new overnight from the colony 3 plate streak. (JB)

Aii: I obtained colonies on all of the plates that I used to transform the Aii and TolB into E. coli, which I hope is a good sign. My next step in the process is to do colony, which I finished today. I used the plasmid specific primers.(CZ)

Dispersin: Today I did the spinsmart plasmid purification protocol on the on the cells that were overnighted last Wednesday and Pelleted on Thursday. (JM)

4 September 2014

Alpha Amylase: Performed a plasmid prep of the colony 3 mutant again. This time I got a much larger pellet of cells from the overnight. The concentration was around 60 ng/uL however. Not sure why I have been getting such low plasmid concentrations lately. (JB)

5 September 2014

Aii: Today I am running my PCR products from Wednesday out on a standard agarose gel. I have a long series of strong bands at the correct size, so I will be purifying two of those colonies and using them for sequencing. (CZ)

Alpha Amylase: Today I started four overnights from the alpha amylase mutant colony 3 streak. Hopefully we will be able to obtain a sufficient concentration of the plasmid since the last few rounds of plasmid prep have yielded unusually low concentrations. (JB)

Dispersin: I took my purfied plasmid of pET15b and PIG97 and set up a restriction enzyme digest using the EcoR1 and Pst1 restriction sites.(JM)

6 September 2014

Alpha Amylase: Today I combined the four overnights down and pelleted them. (JB)

8 September 2014

Alpha Amylase: Today I performed a plasmid prep following the SpinSmart High-copy plasmid purification protocol and materials. Despite the four combined liquid cultures I was only able to get a concentration of 114 ng/uL. This should be sufficient enough though for sequencing. I prepped for sequencing of the mutant colony using the forward and reverse pSB1C3 primers and the new internal primer that was created a few weeks ago. We can also start assaying the amylase in pet15b to determine the pre-mutant efficiency of the protein and later assay the mutant amylase to be sure that the mutation does not decrease the efficacy of the protein. I tested the pH of the biofilm samples to see if we would need to add buffer to them so that the protein would not denature if the pH was hostile. Luckily, the pH range for all of the samples was in the 7.1-7.5 range so we will not need to add any buffer when we start sequencing. (JB)

Dispersin: After digesting I quickly took 5 microliters from each and ran them out on a gel. I was pleased to find bands of the appropriate size for the PIG97 plasmid with the cut out Dispersin B gene as well as a large band for the pET15b plasmid. So I used the full reaction mixtures and ran them out on a low melt gel. Unfortunately they didn't show up under a low power UV light so I needed to use the high power imager in order to remove the appropriate sections from the gel. I then set up a ligation reaction. (JM)

Aii: Today was mostly spent in growing up overnights of my bacteria from two colonies, Plate 2, numbers 1 and 2. These were the two brightest bands on the gel, and were of the correct size. I also worked on the fundraising for our tickets. (CZ)

9 September 2014

Aii: My colonies had grown up fairly well after 24 hours. I spun them down, and also did some work with Jared's Dispersin overnights and plates.

10 September

Alpha Amylase: Today a majority of the time was spent up in Salt Lake City at the University of Utah retrieving N. multiformis from Ananda Shankar, a graduate student at the university. He was very generous and gave us a culture that he had been growing for the past couple of months, frozen stock, and very specific instructions on how to make the media needed for the N. multiform is to grow.

Sequencing data also came back today for the amylase mutant plasmid prep. (JB)

Dispersin: Today I transformed DH5Alpha cells with 7 microliters of my ligation mixture. Given that the bands were difficult to see and cut out however, I also began 4 overnights (two for each) of the PIG97 and pET15 colonies in case the slices I cut from the gel do not have the DNA concentrations necessary to have a successful ligation and subsequent transformation. Lastly I used the DNA gel extraction kit on my gel slices so that if my transformation is unsuccessful I can check and see if I have the necessary DNA by running 5 microliters out on Friday. (JM)

Today I purified the 2 overnights that I did on Monday and spun down yesterday. I used the SpinSmart High-copy plasmid purification protocol, and then Nanodropped the results. It turns out that in both tubes there was a very low count of DNA (approximately 20 ng/uL). Nonetheless I submitted both tubes for sequencing.(CZ)

11 September

Alpha Amylase: Today I spent some more time reviewing the sequencing results. It has been a bit difficult going through and piecing everything together to see if there are or are not any additional mutations to the alpha amylase gene. The coverage was very good and very accurate, but there was a section of the internal primer sequencing that was a bit spotty. There were extra base pairs sometimes, a missing base pair others, or a base pair that could not be read. But the mutation is there! (JB)

12 September 2014

Alpha Amylase: Since there was the spotty section of sequencing where none of the primers picked up the section I prepped two more instances for sequencing, one using the amylase specific forward primer and the other using the internal primer again. (JB)

Dispersin: Unfortunately my ampicilin plate didn't have any colony growth which means that the DH5Alpha cells likely did not pick up the pET15b plasmid which has amp resistance. Which means my ligation probably didn't work. After running out 5 microliters of my extracted DNA from Wednesday I was unable to see any DNA at all, which confirmed my suspicions that my ligation was unsuccessful. It seems I didn't extract it properly from the low melt on Monday. So today I again ran the spinsmart plasmid purification procedure on the overnights. Monday morning I will digest them and in the afternoon run them out on lowmelt. Hopefully this time by doubling the colonies contributing the plasmid the concentration will be high enough to not run into the same difficulties purifying the vector and insert for ligation. (JM)

I redid my overnights for the same colonies. We believe that our LB+CAM has broken down, but I had colonies this time that will hopefully have a higher expression rate. (CZ)

15 September 2014

Alpha Amylase: Sequencing came back and all the rounds of sequencing combined show a complete amylase with signaling sequence for multiformis, a mutated, no longer functioning PstI site, and no additional mutations! This means we can start assaying amylase pre- and post-mutation of the PstI restriction site!

The rest of my time was spent preparing the growth media for multiformis following Ananda's protocol he shared with us. There were some issues with the pH however. It was supposed to be 7.2-7.4. It was reading around 7.8 and when I added the Na₂CO₃ it made the pH even more basic. Will need to discuss what to do about this. (JB)