Team:Groningen/16 August 2010

• Home
• Project Overview | Biofilm | Chaplins | Expression | Applications | Biobricks
• Modeling Overview | Biofilm dynamics | Expression | Kill Switch | Information standard
• Human Practices Overview | Education | Safety | Survey | Ethics | For Parents
• Organization Overview | Brainstorm | Flow Chart | Protocols | Notebook
• Team Overview | Members | Collaboration | Image of Science | Contact
• Judging

Week 25

David

THT Staining - Chaplin ladder

THT reference

Making a reference of pure chaplins is of great importance when comparing results. For a reference 22 mg of extracted and freeze-dried celwalls of streptomyces were used. Chaplins from these cellwalls were then purified by TFA treatment. The monomerized chaplins were diluted in 1 ml demiwater. Then a variety of dilutions was made with demiwater.

Amount of diluted chaplin protein in a 250 ul sample (high concentration reference):

100%
51,2%
25,6%
12,8%
6,4%
3,2%
1,6%
0,8%
0,4%
Blanco(demi+THT staining)
demi water

Low concentration ladder:
0,8%
0,6%
0,4%
0,3%
0,2%
blanco
demi

400px

Expression experiment - David & Peter

The first expression experiment, testing all the constructs that were made so far. We tested for treated pellet and supernatant, untreated pellets were tested as well.

Exression experiment

Peter & David

For this experiment, the following B. subtilis 168 strains were used:

All cultures were grown overnight at 37 degrees Celsius in a shaker room.

Overnight cultures were used to dilute to a B. subtilis culture of 0,1 OD, these strains were divided into ‘’induced’’ and ‘’non-induced’’. Induction with 0,5% subtilin was done at a OD of 0,5 (approximately 2,5 hours after growth of the 0,1 culture started).

After that the OD of the cultures was measured every .. hours.

Sample preperation

After .. hours, .. after induction, the samples were collected and processed. The following procedures were used:

Pellet preperation (PelletPrepGR)

Supernatant processing (SupernatantPrepGR)

Cell disruption (ExtractionCellWallsGR)

Lysozyme preperation (LysozymePrepGR)

Analysis was done using SDS-PAGE (SDS-PAGEGR) and THT staining (THTstainingGR).

Results:

Growth Curve

400px

THT Staining

400px

SDS-PAGE

400px

Modellers: More literature research on ComXPA. Joël, Laura. Researching parts registry for information which is required to build an information standard Arend

Find information about a killswitch, start to model this process Laura