Team:UNITN-Trento/Notebook/Labposts/07/27

From 2013.igem.org

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{
{
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"date" : "2013-07-28",
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"date" : "2013-07-15",
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"author" : "thomas",
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"author" : "gabriele",
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"title" : "EFE + Venus Expression test: FAILED!",
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"title" : "Let's try again",
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"content" : "<html>Starting from an inoculum, I diluted the cells 1:100 in fresh LB and I waited until O.D.600 of the sample reached 0.5. I induced then the cells (V=5ml) with 25 ul of Arabinose (5mM) and I incubated them into thermoshaker at 37&deg;C for 4 hours. One sample were not induced and used as negative control.After 4 hours I tried to use the trans-UV too see any differences between induced sample and control. Both culture had the same color (not fluorescence) so the experiment failed. However the sample was sent for sequencing so now I'll wait the result before restart all the cloning steps..</html>",
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"content" : "<html><h3>What happened to the inocula???</h3>First, I wanted to miniprep 3 inocula... but two were RED!!! So sad, the RFP was present... that's because I forgot to treat the linear plasmid with DpnI :(<br/>I miniprepped the only not-red inoculum, the \"1:1 A\" which had a concentration of 230.5ng/&micro;l. Then I stocked the sample at -20&deg;C. The possible presence of Plac+RFP is a problem since it is nearly as long as the SAM synthetase gene. So, for the screening, I need an enzyme that cuts only one (either SAM synthetase OR Plac+RFP) forming two fragment with a&Delta;length higher than 500bp (otherwise it is impossible to distinguish the two bands). Then enzyme that we will use is AgeI.<br/><hr><h3>Another digestion</h3>So, I purified the SAM synthetase extracted through PCR on <a href=\"https://2013.igem.org/wiki/index.php?title=Team:UNITN-Trento/Notebook#tn-post-2013-07-11-gabriele\">11/07</a>.<center><table class=\"tn-sp-table\"><tr><th>sample</th><th>Quantity</th></tr><tr><td>G1</td><td>116.7ng/&micro;l</td></tr><tr><td>G2</td><td>62.6ng/&micro;l</td></tr><tr><td>G3</td><td>82ng/&micro;l</td></tr></table></center>Then I added 1&micro;l of DpnI to the linear pSB1C3 sample (<b>G2A</b> from <a href=\"https://2013.igem.org/wiki/index.php?title=Team:UNITN-Trento/Notebook#tn-post-2013-07-01-Gabriele\">01/07</a>) and incubated it at 37&deg;C for 1 hour. Then I prepared an overnight digestion following the <a href=\"https://2013.igem.org/Team:UNITN-Trento/Protocols#Digestion\">usual protocol</a>.</html>{{:Team:UNITN-Trento/Templates/Styles/Spoiler|Digestion mixes|<html><center><table class=\"tn-sp-table\"><tr><td style=\"border:none;\"></td><th>EX-SAMsynth-SP</th><th>linear pSB1C3</th></tr><tr><td>Template</td><td>34.27&micro;l</td><td>50&micro;l</td></tr><tr><td>EcoRI-HF</td><td rowspan=\"2\">2.5&micro;l</td><td rowspan=\"2\">1.5&micro;l</td></tr><tr><td>PstI-HF</td></tr><tr><td>NEBuffer 2</td><td rowspan=\"2\">10&micro;l</td><td rowspan=\"2\">5&micro;l</td></tr><tr><td>BSA</td></tr><tr><td>Water</td><td>40.73&micro;l</td><td>0</td></tr></table></center></html>}}<html></html>",
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"tags" : "EFE-Venus"
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"tags" : "SAMsynthetase"
}
}

Revision as of 08:30, 3 October 2013

{ "date" : "2013-07-15", "author" : "gabriele", "title" : "Let's try again", "content" : "

What happened to the inocula???

First, I wanted to miniprep 3 inocula... but two were RED!!! So sad, the RFP was present... that's because I forgot to treat the linear plasmid with DpnI :(
I miniprepped the only not-red inoculum, the \"1:1 A\" which had a concentration of 230.5ng/µl. Then I stocked the sample at -20°C. The possible presence of Plac+RFP is a problem since it is nearly as long as the SAM synthetase gene. So, for the screening, I need an enzyme that cuts only one (either SAM synthetase OR Plac+RFP) forming two fragment with aΔlength higher than 500bp (otherwise it is impossible to distinguish the two bands). Then enzyme that we will use is AgeI.

Another digestion

So, I purified the SAM synthetase extracted through PCR on 11/07.
sampleQuantity
G1116.7ng/µl
G262.6ng/µl
G382ng/µl
Then I added 1µl of DpnI to the linear pSB1C3 sample (G2A from 01/07) and incubated it at 37°C for 1 hour. Then I prepared an overnight digestion following the usual protocol.
Digestion mixes
EX-SAMsynth-SPlinear pSB1C3
Template34.27µl50µl
EcoRI-HF2.5µl1.5µl
PstI-HF
NEBuffer 210µl5µl
BSA
Water40.73µl0
", "tags" : "SAMsynthetase" }