Tuesday 26th August

Lab work

Construction of the fusion protein

plasmid extraction : pGEMTeasy + chromoprotein

by Laetitia

We used the bacteria containing pGEMTeasy + chromoprotein launched by Laetitia monday the 25th for the plasmid extraction, 6 independent cultures which come from the 6 stocks made yesterday.

To extract the plasmid, we used the plasmid DNA purification kit (Macherey-Nagel). Protocol for low copy plasmid.

Digestion of pGEMTeasy+chromoproteinby XbaI and PstI

by Laetitia

The goal is to check the presence of the insert inside the plasmid. We digest the 6 samples of purified plasmid.

3-4h at 37°C

Electrophoresis of the digestion product of pGEMTeasy+chromoprotein

by Laetitia

T : control negatif without enzyme

D : sample digested by XbaI and PstI

D1 - D2 - D3 - D4 - D5 - D6 - T - L

We can see two or three bands for the digested samples : the digestion has worked.

The band at 1500kb is the chromoprotein gene, the band at 3000kb is pGEMTeasy alone. The band at 4500kb is the plasmid containing the chromoprotein gene, non digested.

We decided to use the plasmid samples 3, 4 and 6

Digestion of pGEMTeasy+chromoprotein 3,4 and 6 by EcoRI and PstI

by Laetitia

We digest the remaining sample of plasmid extracted this day (20μl) : samples 3, 4 and 6

37°C - at night

Bacterial culture of pGEMTeasy+chromoprotein samples 3,4 and 6 from bacterial stock

by Laetitia

Culture in 5mL LB + ampiciline (1/1000) - 37°C at night

D - Lemon Scent

Streaking of colonies transformed by BBa_K762100+pGEMTeasy (LS)

Due to yesterday's strange results, we conduct 30 streakings in a petri dish: 28 white colonies and 2 blue colonies.

PCR of LS

by Mélanie

as previously described

Digestion of pGEMTeasy+ LS by SacI

by Laetitia

The goal is to check if the limonen synthase gene is really inside the plasmid. We used the two samples named " LS2 " and " LS3 " which are normally pGEMTeasy+LS .

Electrophoresis of the digestion products by SacI

by Laetitia

T : control negatif without enzyme

D : sample digested by SacI

L - TLS2 - DLS2 - TLS3 - DLS3

The results are weird, the bands on the gel don't match our expectations, we don't know what happened with this plasmid. We should see two bands because the limonene synthase gene were inside the plasmid but we only can see one band which doesn't match with the size of pGEMTeasy+LS or with pGEMTeasy empty...

Culture of bacteria with pps5

by Mélanie

Yesterday we have transformed DH5A with pPS5 (PPSI +CAD. So we do a culture with some clone that have growth on the petri dish

D- Lemon scent

Extraction of pPS3 and pPS4

by Terry

Extraction of plasmid pPS3 (coding beta-pinene) and pPS4 (coding geraniol) with the following protocol

2 different clones with pPS3 and 4 with pPS4 have been used for this extraction.

Stocks of this clones have been made.

Back to the calendar