Team:TU Delft/19 August 2010 content


Revision as of 10:03, 31 August 2010 by Mvoges (Talk | contribs)


Software development

By Jelmer

Part of the dry lab work involves developing an application that can suggest possible interactions between the newly introduced proteins, and the existing E. coli proteome. This page will be updated with the application, documentation and results of applying it to our biobricks.

The basic idea is to look for interactions of the proteins within their own organism, and map those interactions by looking at homologs in E. coli: IGEMTUDelft Interactiongraph.PNG

The resulting list of interactions might be usable to 'debug' the resulting bacteria, i.a.w. suggest reasons why the system is not working like it should. Even though there would be no time to fix those problems, it could still help teams in following years that want to take another stab at solving the problem.

Today the work on this application resulted in the first list of some potentially interacting proteins. A locally running version of the STRING protein database (~150 gb PostgreSQL database) was used to look for interactions and homologs . Ideally however, this application would work using existing biological databases. I'm still looking for the right webservices to accomplish this, they might not exist.

Alkane Degradation


The results from sequencing are in! It appears that K398013 is not exactly as we expected it to be. A new method of making 013 (however without the terminator region) will be attempted by ligating 009 and 010 digestion products:

# Sample Enzyme 1 Enzyme 2 Enzyme 3 Buffer BSA Needed fragment
1 009A SpeI PstI None NEBuffer 2 ‘S - J23100-J61100-RubA4-pSB1A2 - P’
2 010A XbaI PstI AseI NEBuffer 3 ‘X - J61100-RubR - P’

The digestion mixes were incubated for 1 hr. at 37 degrees and partially loaded onto a 1% agarose gel:

1% agarose of digestion mixes. Gel run at 100V for 1 hour. Of all samples 10 µL was loaded with 2 µL loadingbuffer. 5 µL was loaded of marker

Lane description

# Description Expected size (bp) OK?
1 Smartladder Varies Yes
2 009A cut 2309, 14 Yes (vague)
3 010A cut 1246, 1185, 872, 43 Yes
4 EZ Load Varies Yes


Following the digestion the products were ligated for 1 hr. at 20 degrees:

# BioBrick Fragment 1 Fragment 2
1 014C ‘S - J23100-J61100-RubA4-pSB1A2 - P’ ‘X - J61100-RubR - P’


The ligation mix was trasnformed into chemically competent TOP10 cells and plate out onto AMP plates.

Ligation Kinetics

The results of the ligation efficiencies at varying times were as follows:

# Incubation time [min] # colonies
1 30 64
2 60 100
3 120 80
4 240 60

The digestion control plate contained 1 colony, indicating a negligible background. From this experiment we can thus conclude that a 1 hr. ligation is long enough to obtain sufficient transformants.