Team:Macquarie Australia/Notebook

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Revision as of 11:40, 22 September 2012



Notebook

To browse through our notebook simply click on the image with the date. It will expand with what we did that week. To continue on simply click on the next one. If the notebook isn't functioning as planned (it will not load the next tab of content) then please go to our linearised view which is located here.



Week 1- Tuesday July 31st

With the break between semesters over, the Macquarie iGEM returned to classes. For us this was the first day of iGEM 2012. We had our first meeting and discussed our project. Dr. Louise Brown and Associate Professor Rob Willows were introduced the team and we began to determine who would take on certain roles within the team.

We eagerly began our project, deciding to use the novel approach of Gibson Assembly to produce our optimised genes. We had decided to develop a gene-switch controlled by light. To do this a several genes would be required:

  1. a bacteriophytochrome
  2. Heme oxygenase

Gibson Assembly

The bacteriophytochromes from Deinococcus radiodurans and Agrobacterium tumefaciens were chosen. Over the next week Matt Stclair started to develop the G-blocks by:

  1. Acquiring the DNA sequence
  2. Translating into the protein sequence
  3. Using the DNA sequence, optimise codon usage for E. coli
  4. Translating into protein sequence and ensuring no changes in amino acids relative to the original sequence

Week 2- Tuesday 7th August

Media prep

Our lab work began today with the preparation of liquid media, plates and buffers. The protocols we followed are located here.

We prepared the following:

  • Liquid LB Media
  • SOC Solution
  • SOB Solution
  • LB Agar Plates
  • Ampicillin LB Agar Plates: 31 plates
  • Chloramphenicol LB Agar Plates: 33 Plates
  • Kanamyacin LB Agar Plates: 32 Plates
  • TB buffer.
  • TAE buffer.
  • EDTA buffer.

While the lab group produced the necessary materials, another team began developing the G Blocks. The G Block team consisted of Ellaina, Matt Smith, Matt Stclair, Harry, Gazelle, Silas, Kim, and Miguel. Matt Stclair spearheaded the effort and proofread all the sequences we had developed to ensure that we had not changed the protein sequence or introduced restriction sites.

Ryan volunteered to be the wiki chief with Erin helping out throughout the project. Ellaina ensured the key safety questions were answered, and relayed these to the rest of the team. Rob and Sarah took control of the seeking finances to get the team to Hong Kong.

In a Macquarie iGEM first, the team took a big interest in the idea of human outreach and we had a brainstorming session. Ellaina proposed that we visit a high school while Elle suggested that the Universities open day would be a great opportunity to communicate with the wider community. Ellaina took control of developing our high school visit and Elle took control of Open Day.

Week 3- Tuesday 14th August

In anticipation of our G Blocks arriving next week, competent cells were prepared. The protocol followed can be seen here.

Human Practice planning went into overdrive this week. To engage the wider community, fluorescent and bioluminescent parts from the registry were selected and transformed in E. coli. Red, Green, Orange, and Cyan Florescent protein as well as Luciferase were all located and transformed in the competent cells available. More details can be seen here.

Week 3- Wednesday 15th August

Open Day Preparation

Our open day preparation did not go as planned. Most of our transformations were unsuccessful, we believe this was because SOC was added after the heat shock. As disappointing as this was, there was one little piece of good news.

A single colony of Top 10 E. coli containing GFP insert was identified on a plate of LB agar media. LB agar and nutrient agar plates were struck using this colony. The colony was also used to inoculate 5mL of nutrient broth. Plates and stock were then incubated at 37°C overnight. Both of the streaked plates and the broth showed significant growth of E. coli colonies which could fluoresce when exposed to UV light.

Finances

We got our first news on the finances front. Unfortunately, Qantas declined to sponsor the effort of getting our team to Hong Kong. This was soon forgotten when the Macquarie University School of Medicine, Agilent and the Defence Science Institute (thanks Yagiz) all agreed to sponsor our team. Hong Kong here we come.

Gibson Assembly Preparation

Design of the G Blocks continued. The fragments were designed with melting temperatures NEED TO ASK STCLAIR. However, IDT had significant synthesising them due to GC rich regions. Unfortunately for the MQ iGEM team, IDT is based in the USA and our lab sessions do not coincide with business hours. The G Block saga continued for a couple of weeks with new GC rich regions that affected synthesis identified with each modification made.

Week 4- Tuesday 21st August

G Block Update

The team received the best news of the iGEM experience so far. Our G Blocks finally had no GC rich regions that inhibited synthesis. With the G Blocks arriving in the next week, we prepared for the assembly and took the opportunity to spend more time planning our two aspects of human practice.

Checking Competency

The efficiency of the competent cells produced was determined by transforming with the fluorescent constructs being used for the open day activities.

Week 5- Tuesday 28th August

Outreach Planning

The two outreach teams prepared the presentations for next week. The school outreach team would be travelling up to Green Point Christian College on Tuesday next week to talk to their Year 12 HSC Biology class about ethics in synthetic biology.

The open day team developed more powerpoint presentations and posters for the activities planned. As part of this planning we drew pictures of different Australian icons with Green Fluorescent and Red Fluorescent proteins. The protocol we followed can be seen here here.

Week 5- Friday 31st August

Arrival of G Blocks

Our G Blocks finally arrived, after a long period of time getting the GC content down. Unfortunately for us, they arrived late on Friday afternoon, so the Gibson Assembly would need to wait to till the following Tuesday. Problems encountered from August 11th - August 26th included high GC content in the sequences to be synthesised, in particular, the Deinococcus fragments. These sequences had to be codon optimized and accepted by IDT before synthesis began.

Week 6- Tuesday 4th September

School Visit for Human Outreach

The human outreach school team consisting of Ellaina, Ryan, Daniel and Matt Smith all visited Green Point Christian College to talk about the ethics and concerns surrounding synthetic biology. We received wonderful feedback and had a great discussion of what we were doing in our project. The students also had a few ideas for synthetic constructs that could be used in future iGEM teams.

The students completed surveys so we could gauge the change in their perspective of synthetic biology before and after our seminar. The results of our surveys can be seen here here.

Open Day Planning Team

The activities for open day were finalised and all of our prosters were prepared. We decided to try to communicate to a younger audience by using a Lego theme. All of our posters can be seen by clicking on the heading above

Gibson Assembly Begins

In anticipation of the Gibson assembly we prepared more competent cells. Harry, Matt St Clair, Silas and Kim performed our first Gibson Assembly reaction for each gene we prepared with different linearised vector (Parts PSB-1C3, PSB-1K3, PSB-1A3 from the registry). The synthesised genes were transformed in the competent cells prepared. For a more detailed analysis of the

Week 6- Wednesday 5th September

Matt looked at the transformed cells we cultured the previous day (04/09/12). Two small colonies of the transformed Deinococcus bacteriophytochome without the T7 promoter were grown on kanamycin. The positive control was successful, so we could infer that the reactions were proceeding as expected. The positive control was also cultured on XGal and incubated overnight.

The Deinococcus fragment was cultured in 2 tubes of LB broth (2 mL) containing kanamycin. The transformations performed on the previous day were done again with a slightly different method. We choose to redo the transformations as the efficiency was relatively low. The transformations were re-innoculated onto fresh plates and incubated over night.

Week 6- Thursday 6th September

We continued on from the Gibson assembly and transformations we performed. Daniel did a plasmid prep using a QIAprep Spin Miniprep Kit by Qiagen, for two colonies from the Deinococcus bacteriophytochrome. The plasmid preparation protocol can be seen here.

Week 6- Friday 7th September

Plasmid Preparation

Plasmid Preparation was continued from Thursday, by Daniel and Harry, using the QIAprep Spin Miniprep Kit by Qiagen. A total of 7 colony cultures were used as the remaining did not grow. Successful cultures included 6 colonies from 1C and 1 colony from 3K. The DNA concentration was then determined for each sample by NanoDrop, with EB buffer from the Miniprep Kit used as a blank. The concentration of the plasmid extracted was determined using a NanoDrop and the results can be seen here.

Week 7- Tuesday 11th September

Sequencing Results

The team received excellent news from the sequences performed on Friday. We had produced our first gene that is suitable for a biobrick! We had successfully produced the T7 promoter containing Heme Oxygenase. We then took this plasmid and inserted into BL21 E. coli to overproduce the protein and allow us to characterise the gene.

Gibson Assembly Round 2

Unfortunately none of the bacteriophytochrome Gibson reactions were successful, so these were repeated by Ryan, Kim, Silas and Matt. Unlike the first assembly, for the second round of Gibson assembly we decided to assmble into 3 different vectors for each reaction. That is, each bacteriophytochrome genes were assembled into one of three different vectors, each containing antibiotic resistance for kanamycin, chloramphenicol and ampicillin. In total 9 Gibson reactions were performed which are summarised below and details of this procedure can be seen here


Gene
Antibiotic Resistance (Registry Part)
Deinococcus bacteriophytochrome Ampicillin (PSB-1A3) Kanamycin (PSB-1K3) Chloramphenicol (PSB-1C3)
T7+Agrobacterium bacteriophytochrome Ampicillin (PSB-1A3) Kanamycin (PSB-1K3) Chloramphenicol (PSB-1C3)
Agrobacterium bacteriophytochrome Ampicillin (PSB-1A3) Kanamycin (PSB-1K3) Chloramphenicol (PSB-1C3)

Gibson Assembly Transformations

The previous Gibson reaction used heat transformations, we wanted to determine whether electroporation yielded greater efficiency. Therefore we performed transformations using both of these techniques to determine which is the better method.

Media Preparation

Using the standard procedures, more kanamycin and chloramphenicol plates were prepared.

Week 7- Wednesday 12th September

The transformations from the previous day were examined and colonies were counted. Growth was slow so they were left till the afternoon to be counted. The counts can be seen here.

Week 7- Thursday 13th September

Plasmid Prep and Sequencing

Ryan inoculated cultures of the transformations in the morning so Andrew and Daniel could complete the plasmid prep in the afternoon. The concentrations of the plasmids obtained can be seen here. All of the plasmids were sent for sequencing to determine if the assembly had proceeded as expected.

Week 8- Monday 17th September

Restriction Digests

With our midsemester break beginning and no other classes we could commit more time to the project. With the deadline fast approaching and the sequencing data returning tomorrow, we took the opportunity to digest all of our plasmids and prepare them for ligations. We were able to characterise the biobricks we had produced by inspecting the digestion pattern on the gel. The digest we performed are summarised below,


Biobrick Part Restriction Enzymes Used
T7 promoter + Heme Oxygenase EcoR1 and Spe1
Heme Oxygenase (No T7) Xba1 and Spe1
Deinococcus Bacteriophytochrome Xba1 and Pst1
T7 promoter + Agrobacterium EcoR1 and Spe1
Agrobacterium Xba1 and Pst1

Characterisation

The Biobricks we had produced were characterised by running on a gel following the restriction digest. For the above gel image:

1) There are relatively equal intensities of the two bands present. At approximately 750 bp is the heme oxygenase insert and at 2000 bp is the vector backbone.

2) In these lanes, there was less material loaded and thus the two bands present are poorly resolved. The Deinococcus phytochrome insert and the backbone are approximately the same size (2000 bp) as expected. The digestion may have been incomplete and thus there is a presence of circular and supercoiled plasmid, phytochrome insert and cut backbone.

For the above gel image:

1) No digest occurred and does not have the expected bands

2) Another incomplete digestion occurred and the enzymes used were the same as in the Deinococcus digestion with X + P and again, may not be reliable.

3) The lanes with expected bands are shown in the 1st and 3rd lanes of this Agro T7 treatment.

4) Linearized backbones

Heme Oxygenase Functionality

Week 8- Tuesday 18th September

This is a trial. I do not know if this is going to work or not!

Week 8- Wednesday 19th September

This is a trial. I do not know if this is going to work or not!

Week 8- Thursday 20th September

******************************** add Andrew's work + Nano Drop results

Week 8- Friday 21st September

This is a trial. I do not know if this is going to work or not!









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