Team:Groningen/Notebook/17 July 2009

From 2009.igem.org

Wet

GVP Cluster

Discussion:

All colonies (transformants vector + promoter ligated with gvp) and o/n culture became red, so probably RFP is still in there... What might be the problem? The vector with promoter self-ligated due to uncomplete digestion (done 15 July 2009) leading to the following fragments:

• vector+RFP linear
• vector
• RFP

When the upper fragment (~2kb) is contaminated with linear vector this would lead high efficiency self-ligation instead of ligating gvp with the emtpy vector.

→TODO Therefore the restriction/purification/ligation will be redone and selection of non-red colonies will be made!

→DONE Also plasmid from the o/n cultures will be purified and analysed by restriction analysis.

• For plasmid isolation the Sigma Plasmid isolation kit was used (eluted in 50ul MQ).
• DNA concentrations:

• Restriction analysis with SpeI and PstI to find insert length.
  • Expected length of with / with RFP insert: 2096bp(promoter + plasmid backbone), 887bp(RFP)
  • Expected length of with gvp insert: 2096bp(promoter + plasmid backbone),6096bp(gvp)
  • Expected length of with gpv insert: 3513(plasmid backbone), 6096 (GVP cluster)

Restriction mixture for J23100+gvp and GVP

• 10 μL promoter plasmid (61.4 ng/μL, 96.1 ng/μL)
• 6μL MQ
• 2μL Fast digest buffer
• 1μL PstI fast digest enzyme
• 1μL SpeI fast digest enzyme

10ul was loaded on a 1%TBE agarose gel and ran for 30 @ 100V (V const)

→From left to right: 1kb marker, gvp-promoter () construct nr 9, nr 10, gvp in , promoter ()

So the assumption that the vector with the promoter self-ligated was right, as the gvp-promoter construct has the same bands as the promoter has and the size of the bands are as expected for a RFP insert.

Transporters

Below yesterdays PCRs, There seems to be a vague band at ~1000 in A1 and E1. therefore loaded the last 20 uL PCR Product on gel as well. showing an expected product op 970bp.

Because of the negative results we will try to get positive results with an other polymerase enzyme; Phusion. And try the cloning again as planned. PCR1 Fw,mut1RC should give product of 1153bp and PCR2 Rev,mut2RC a 261bp size product. Further more we will test a PCR with pBAD 24 Fw,rev to test the template and look at options to get smaller templates (2222 bp).

Metal Accumulation

Vectors

Dry