Tag
OmpA

Part:BBa_K103006:Experience

Designed by: Michael Lower   Group: iGEM08_Warsaw   (2008-09-14)
Revision as of 17:54, 5 October 2011 by Wishyx (Talk | contribs) (→‎'Hunter and prey' system)

This experience page is provided so that any user may enter their experience using this part.
Please enter how you used this part and how it worked out.

Applications of BBa_K103006

User Reviews

UNIQd3f388d3259a55a9-partinfo-00000000-QINU

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Paweł Krawczyk

This part was used as a outer-membrane-targeting factor in 'hunter' part of our project.

We've checked if proteins fused to OmpA are present on the outer cell membrane of E.coli - please take a look on our [http://2008.igem.org/wiki/index.php?title=Team:Warsaw/JSTest&num=2&arg0=12_August_2008&arg1=13_August_2008&name=Checking%20for%20presence%20of%20protein%20A%20on%20the%20cell%20membrane notebook entries]

This part was used in fusion with another parts:

For detailed information please check 'Experience' subpages of those parts using links above.

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••••

Yunxiao

This part contains a fragment sufficient to transport the target protein outside the bacteria. We tested the expression conditions for optimum transport.

In our part

All used OmpA for efficient transport onto the outer membrane of E. coli.

In our part Part:BBa_K533005, we fused OmpA to GFP and inserted a his tag for convenient detection.

After induction at 18 centigrade for 12 hours in BL21, we harvested the bacteria and digested it with Protease K at 50 centigrade for 30min.

Color Channel Post-digest Pre-digest
GFP Thuexp gn.png Thuexp gp.png
DAPI Thuexp gn d.png Thuexp gp d.png
Merge Thuexp gn m.png Thuexp gp m.png

The results suggested that GFP was efficiently transported onto the outer membrane.

Cellular fractionation and western blotting confirmed the results that GFP is predominantly on the membrane.

Thuexp west.png

We further tested the induction conditions with our part Part:BBa_K533002.


Color Channel 0.1mM IPTG induction 0.5mM IPTG induction 1.0mM IPTG induction
mCherry Thuexp bind 0.1.png Thuexp bind 0.5.png Thuexp bind 1.0.png
DAPI Thuexp bind 0.1 d.png Thuexp bind 0.5 d.png Thuexp bind 1.0 d.png
merge Thuexp bind 0.1 m.png Thuexp bind 0.5 m.png Thuexp bind 1.0 m.png

It seems that the transport efficiency is highest when BL21 is induced at 0.1mM IPTG at 18 centigrade. This result suggests that, under the drive of an extremely strong promoter as T7, lowering expression level is necessary for efficient transportation.

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UNIQd3f388d3259a55a9-partinfo-00000003-QINU