Difference between revisions of "Part:BBa K606035:Experience"

 
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This experience page is provided so that any user may enter their experience using this part.<BR>Please enter
 
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how you used this part and how it worked out.
 
  
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===Applications of BBa_K606035===
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We hae characterized this part transforming it into a BL21 strain. This strain carries insite the chromosome a T7 polymerase under the control of an IPTG inducible promoter. This strain is mostly used for protein expression for protein purification application.
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=== Growth measurements ===
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The measurements had been carried on in a TECAN i-control machine, at 37°C under transcient shaking, for 4h, for several colonies and several range of IPTG concentration. The OD 600nm and the fluorescence of the GFP (exc: 470nm / meas:515 nm) was measured every 5 min, and the ratio of the two was calculated.
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The offset values for these curves was adjusted for better visualisation. The values given are in arbitrary units.
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[[Image:GrowthpT7GFPt7ter.jpg|center|thumb|500px|Fig1: Growth curves for BL21 strain carrying the part, in the presence of cloramphenicol]]
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First we see an inflexion in the curve, that is due to the stong influence of the IPTG on the metabolism of the cells. Then, this loss it taken up and the bacteria start growing again. We see a clear increase of the fluorescence with the IPTG concentration, that is to say with the quantity of T7 polymerase in the cell
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=== Comparison of the growth with the traduction saturated cells ===
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===User Reviews===
 
===User Reviews===

Revision as of 10:05, 21 September 2011


We hae characterized this part transforming it into a BL21 strain. This strain carries insite the chromosome a T7 polymerase under the control of an IPTG inducible promoter. This strain is mostly used for protein expression for protein purification application.

Growth measurements

The measurements had been carried on in a TECAN i-control machine, at 37°C under transcient shaking, for 4h, for several colonies and several range of IPTG concentration. The OD 600nm and the fluorescence of the GFP (exc: 470nm / meas:515 nm) was measured every 5 min, and the ratio of the two was calculated.

The offset values for these curves was adjusted for better visualisation. The values given are in arbitrary units.

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Fig1: Growth curves for BL21 strain carrying the part, in the presence of cloramphenicol

First we see an inflexion in the curve, that is due to the stong influence of the IPTG on the metabolism of the cells. Then, this loss it taken up and the bacteria start growing again. We see a clear increase of the fluorescence with the IPTG concentration, that is to say with the quantity of T7 polymerase in the cell

Comparison of the growth with the traduction saturated cells

User Reviews

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