Team:Stockholm/15 October 2010

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Contents

Nina

Continuation of protein purification

Washing

I washed the column with 10 X volumes of wash buffer.

The Ni-resin (in the form of pellet) is 10 ml, therefore 10 * 10ml Ni-NTA = 100 ml wash buffer.

The imidazole is 2 M.

2M * Volume = 100 * 30 *10^-3 M Volume imidaziole that needs to be added in the wash 100 ml is 1.5 ml

Washing:

Aq14.jpg

Elution

I eluted the column with 5 X volumes of elution buffer.

The Ni-resin (in the form of pellet) is 10 ml, therefore 5 * 10ml Ni-NTA = 50 ml elution buffer.

  • 20 ml 40 min on shake 4°C
  • 10 ml 30 min on shake 4°C
  • 10 ml 30 min on shake 4°C
  • 10 ml 30 min on shake 4°C

I saved these samples in the cold room 4°C for tomorrow.

Agarose gel verification

I ran the PCR products on an 1 % agarose gel 80 V to check if I had any inserts.

Ladder: MassRuler™ DNA Ladder Mix, ready-to-use, 80-10,000 bp

Aq12.jpg

Arrangement on gel:

Aq13.jpg

Gels:

Aq15.jpg

Unfortunately non of the bands show that there has been an insert, it might be that the transformation into BL21 cells was not a good idea since they are not cloning cells, but we are short on time and I tried to make a short cut. It might have failed this time. I will run a new screen with 16 colonies/dish, it that won't work then this cloning has not worked out well.

Andreas

Growth curve assay

Setup

Inoculated new flasks from ON cultures set 14/10:

  • 250 ml E-flasks
  • 25 ml LB + Amp 100 + 1 mM IPTG
  • 250 μl ON culture
    1. BL21 pEX.SOD⋅His
    2. BL21 pEX.nTra10⋅SOD⋅His
    3. BL21 pEX.nTAT⋅SOD⋅His
    4. BL21 pEX.nLMWP⋅SOD⋅His
  • 37 °C, 225 rpm

OD590 measurements made every 30 min with appropriate dilution in fresh LB.

OD590 measurements

  0 min 30 min 60 min 90 min 120 min 150 min 180 min 210 min 240 min 270 min 300 min 330 min 360 min 390 min
pEX.SOD⋅His 0.035 0.047 0.090 0.180 0.195 0.176 0.251 0.177 0.239 0.140 0.164 0.205 0.196 0.193
pEX.nTra10⋅SOD⋅His 0.037 0.050 0.092 0.163 0.156 0.132 0.175 0.130 0.164 0.116 0.155 0.167 0.154 0.168
pEX.nTAT⋅SOD⋅His 0.033 0.046 0.090 0.170 0.177 0.161 0.225 0.153 0.225 0.045 0.170 0.162 0.193 0.200
pEX.nLMWP⋅SOD⋅His 0.031 0.042 0.86 0.174 0.192 0.178 0.237 0.170 0.242 0.137 0.180 0.185 0.200 0.200
Dilution factor 1 1 1 1 2 4 5 10 10 20 20 20 20 20
Line chart of plotted OD(590) measurements from growth assay.

Results

Results indicate no significant difference in growth between different cultures. Slightly lower curve for the nTra10-expressing clone, which is somewhat interesting, since a similar progress was seen in the canceled experiment from 14/10. At least one more experiment will be run next week, using new BL21 clones; this will show whether this is just a coincidence or not.