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SinOp system experiments

Desing and cloning for the KinA

{| border="1" class="wikitable" style="text-align: center;" |Sporulation assay with KinA overexpression |- |[[File:spor1.jpg|450px|thumb|center|Induction of sporulation after 3h on CDH Medium +4mM IPTG]] |[[File:spor2.jpg|450px|thumb|center|Induction of sporulation after 3h on CDH Medium +4mM IPTG]] |- [[File:control spor.jpg|450px|thumb|center|Negative control of sporulation after 3h on CDH Medium +0mM IPTG]] |}

We suceeded in recovering the KinA gene from the non biobricked plasmid synthetized de novo by the 2009 Newcastle team, and cloned it into a standard biobrick plasmid, pSB1C3. Then we cloned this gene in front of the pVeg-SpovG (K143051) promoter + RBS. These two constructs had bees sended to the registry into pSB1C3.

This construct has been cloned right away into a replicative plasmid for subtilis and transformed, and we are caracterizing it at the moment.

Characterizing the SinI system

As explained in the design page

In order to verify the function of SinI, we tested its activity under the Hyperspank promoter. Upon induction, a clear phenotypic change occured where cells turned into chain-like growth regime (fluorescent cellsin image), unlike wild-type cells that kept their regular elongated separated cell phenotype (non-fluorecent cells in image).

You can find the video of our results for the tRNA with IPTG here and without IPTG here.

Preparation of slides

Dilution of overnight cultures : YC164 and YC227 (SinOp Design) .

YC227 produces SinI which enhances biofilm formation. If SinI diffuses through the nanotubes we expect to see fluorescence from Peps-gfp construct in the receiver cells.

Two well slides : 1-control (YC164 with IPTG) 2-Mix (both strains with IPTG)

Observation

-37°C Microscopy-

We observed the plate with TRANS and YFP-filter settings on the Old Zeiss. Unfortunately, this microscope gets quickly out of focus so we need to take each picture manually. As expected, YC227 was producing GFP at the begining of the experiment, while YC164 was not. Our observations over 4 hours are the following:

• YC164 grows fast (several divisions over the experiments)
• YC227 does not grow at all and keeps its fluorescence pretty well
• YC164 does not change its state (no obvious biofilm formation)
• After letting the plate overnight we still see some florescence but not as if YC164 changed its fluorescence status.

Our conclusions

We might have poorly chosen the exact phase growth or our timing when plating the strains. Nanotube formation seems to require a more tightly packed colony. We will try this tomorrow. Biofilm formation is usually observed at lower temperatures and it could mean we will never see anything with this design (be reminded that we did not do any cloning for this construction, we only add to reuse strains from another scientific team).