Notebook3

Measurement of Lysis Cassette

Sunday, September 26 By: Wataru, Ken

After overnight pre-culture, dilute with supplemented M9 media as OD550 was 0.22, and measure OD550 every 30min. At the point of 30min, we add IPTG and continued to measure OD550. We used test tubes to cultivate E.coli. We cultivated E.coli in test tubes at 37 degreees.

	0	30	60	90	120	150	180	210	240
0mM	0.22	0.38	0.57	0.89	1.20	1.52	1.80	2.00	2.03
0.1mM	0.22	0.41	0.57	0.85	1.14	0.71	0.40	0.13	0.17
0.2mM	0.22	0.40	0.55	0.86	0.26	0.11	0.09	0.10	0.11
0.3mM	0.22	0.39	0.54	0.79	0.16	0.08	0.09	0.10	0.10
0.4mM	0.22	0.37	0.49	0.64	0.05	0.02	0.03	0.04	0.06
0.5mM	0.22	0.40	0.54	0.64	0.08	0.06	0.07	0.08	0.08

Discussion:

We can observe the cell lysis and this result suggest that the timing of the start of cell lysis is depending on the concentration of IPTG.

	0	30	60	90	120	150	180	210	240
0	0.36	0.56	0.97	1.36	1.69	1.84	1.94	1.99	2.00
0.01	0.22	0.51	0.74	1.12	1.50	1.76	1.91	1.92	1.92
0.03	0.26	0.56	0.75	1.12	1.51	1.76	1.37	0.91	0.68
0.05	0.27	0.58	0.76	1.11	1.49	1.56	0.50	0.24	0.25
0.07	0.25	0.52	0.73	1.12	1.39	1.08	0.18	0.17	0.16
0.1	0.26	0.55	0.75	1.09	1.07	0.77	0.14	0.17	0.17
1.0	0.26	0.55	0.77	0.13	0.12	0.13	0.18	0.15	0.12

Discussion:

When the concentration of IPTG is over 0.03mM, cell lysis occurs. We continued to incubate these cultures overnight.

Monday, September 27 By: Wataru, Ken

All of the cultures was over 2.0 of OD550. We caouln't find out the cause of it.

Monday, October 4 By: Ken

	0	42	72	105	135	166	201	224
0mM	0.215	0.377	0.524	0.841	1.215	1.701	2.374	2.791
0.01mM	0.205	0.372	0.531	0.777	1.136	1.646	2.501	2.653
0.03mM	0.133	0.284	0.401	0.812	0.865	1.321	1.779	2.209
0.05mM	0.222	0.359	0.501	0.645	1.075	1.654	2.197	2.465
0.5mM	0.269	0.403	0.532	0.767	0.616	0.734	0.899	0.793

We couln't observed the cell lysis.

Tuesday, October 8 By: Ken

	0	35	65	95	130	160	197	245	290
0mM	0.16	0.265	0.427	0.626	0.954	1.065	1.77	2.28	2.529
0.01mM	0.16	0.266	0.421	0.604	0.936	1.029	1.75	2.22	2.527
0.02mM	0.16	0.258	0.412	0.594	0.932	1	1.74	2.26	2.36
0.03mM	0.16	0.254	0.401	0.587	0.897	0.93	1.57	2.06	2.242
1.0mM	0.16	0.27	0.352	0.318	0.297	0.122	0.59	1	1.349

In 1mM IPTG, the cell lysis surely occured, however, E.coli started to grow soony.

Saturday, October 9 By: Ken

We considered that the cause of these unclear result was a degration of antibody. So we added kanamysin to be 100ug/ml and 50ug/ml and measured the difference.

	0	80	125	155	205
0mM	0.145	0.474	0.827	1.183	1.815
1mM	0.145	0.338	0.271	0.344	0.625
1mM(1/2)	0.145	0.389	0.34	0.366	0.646

As a result, the amount of kanamysin is not related.

10/10 Ken

We cultivated E.coli transformed with K350819, and extracted this plasmid, and id sequence analysis. As a result, R0011, a lactose promoter, had mutation as follows.

This is because K350819 is over 7000bp and easier to have turn over and λ　lysis cassette is toxic. We dicided to cultivated E.coli 30 degrees.

Team:Kyoto/Notebook3

From 2010.igem.org

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