Difference between revisions of "BBa K731700 and BBa K731710 measurements"
Line 16: Line 16:
 
*grow 37°C in the termoshaker until OD ~ 0.4.
 
*grow 37°C in the termoshaker until OD ~ 0.4.
 
*(chill on ice for the whole duration of this point) dilute samples to OD 0.2 in order to have the same OD at the moment of induction.
 
*(chill on ice for the whole duration of this point) dilute samples to OD 0.2 in order to have the same OD at the moment of induction.
−
**x = 10ml*0.2OD/0.4OD       where x are the ml of culture you need to take from the culture in the termoshaker.
+
**x = 10ml*0.2OD/0.4OD ___ where x are the ml of culture you need to take from the culture in the termoshaker.
−
**LB = 10ml-x                             where LB are the ml of LB you need to add to x to obtain OD 0.2.
+
**LB = 10ml-x ____________ where LB are the ml of LB you need to add to x to obtain OD 0.2.
 
*grow 37°C in the termoshaker until OD ~ 0.6.
 
*grow 37°C in the termoshaker until OD ~ 0.6.
 
*induce with 0.5mM IPTG.
 
*induce with 0.5mM IPTG.

Revision as of 20:48, 20 September 2012

Hello world

In this page we are really proud to introduce you the protocol we (Giacomo and Anna) developed for the characterization transcriptional terminators effects on gene expression. (Tested on BBa_J64997)

The develop of this protocolcost us not only sleepless night but also sunny and beautiful weekend of trekking so just shut up and read it all.


IN VIVO ANALYSIS

CELLS GROWTH AND SAMPLES PREPARATION (starting from a glycerol stock):

  • 100ul of cells in 10 ml fresh LB (4 glycerol stocks of each platform with or without terminator in BL21(DE3) pLysS) in 50ml falcon.
    • NOTE:Antibiotic are at concentration of 0.1mg/ml ampicillin and 0.035mg/ml cloranphenicol
  • grow 37°C in the termoshaker until OD ~ 0.4.
  • (chill on ice for the whole duration of this point) dilute samples to OD 0.2 in order to have the same OD at the moment of induction.
    • x = 10ml*0.2OD/0.4OD ___ where x are the ml of culture you need to take from the culture in the termoshaker.
    • LB = 10ml-x ____________ where LB are the ml of LB you need to add to x to obtain OD 0.2.
  • grow 37°C in the termoshaker until OD ~ 0.6.
  • induce with 0.5mM IPTG.
  • 3 hours induction at 37°C in the termoshaker.
  • chill falcon on ice
  • move 1ml of induced culture to an eppendorf.
  • sonication (3 repetition of 10s. 50% amplitude sonication and 30s. of pause).
  • 1.5min centrifuge.
  • move supernatant from eppendorf to cuvette.
  • add 2ml buffer (i.e.: PBS)
  • leave the cuvettes O/N in the 4°C fridge
  • fluorimetric measurements




Measurements of part K731700 and K731710