IGEM:MIT/2007/Notebook/2007-6-13: Difference between revisions
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*Best ratio is between 3:1 to 5:1 of insert to backbone | *Best ratio is between 3:1 to 5:1 of insert to backbone | ||
*Use this equation | *Use this equation | ||
< | **<math>M_{I} = Moleratio_{\frac{I}{v}} * \frac{bp_{I}}{bp_{v}} * M_{vector}</math> | ||
**Usually want <math>M_{v}</math> to be between 20ng and 100ng | |||
Usually want | **Once we solve for <math>M_{i}</math> we should multiply it by between 3-5 to get the appropriate ratio | ||
Once we solve for | |||
*Actual Calculation for a 4:1 ratio | *Actual Calculation for a 4:1 ratio | ||
<pre> | <pre> | ||
Line 69: | Line 66: | ||
m_I = 24.61 ng | m_I = 24.61 ng | ||
</pre> | </pre> | ||
<math>\frac{4695}{720}=\frac{m_{v}}{m_{I}}</math> | |||
* Reagent List for the Ligations | * Reagent List for the Ligations | ||
;ddV:Double Digested Vector | ;ddV:Double Digested Vector | ||
Line 75: | Line 73: | ||
;dI:Single Digested Insert | ;dI:Single Digested Insert | ||
* Reagent Amounts | * Reagent Amounts | ||
<html> | <html><pre> | ||
<pre> | |||
<b>Reactants ddV ddV+ddI dV dV+dI</b> | <b>Reactants ddV ddV+ddI dV dV+dI</b> | ||
<b>Vector</b> 11 ul 11 ul 4 ul 4ul | <b>Vector</b> 11 ul 11 ul 4 ul 4ul | ||
Line 84: | Line 81: | ||
<b>T4 Ligase</b> .5 ul .5 ul .5 ul .5 ul | <b>T4 Ligase</b> .5 ul .5 ul .5 ul .5 ul | ||
<b>Total</b> 20 ul 20 ul 20 ul 20 ul | <b>Total</b> 20 ul 20 ul 20 ul 20 ul | ||
</pre> | </pre></html> | ||
</html> | * Insert the ligations into a PCR machine and run the IGLIGATE Program | ||
**IGLIGATE -> Tubes -> Volume = 20 ul | |||
**16 degrees C for 5 hours | |||
**60 degrees C for 10 minutes to heat kill the enzymes |
Revision as of 11:16, 13 June 2007
Grad Advisors
- Morning: Eric
- Afternoon: L-A
LAB WORK
- Purify digests on gel (EGFP and NNX)
- Ligation overnight
- Pour LB/Amp plates
Purifying the DNA
- Denature the enzymes by exposing the samples to high heat in the Master Gradient Cycler.
- Put the samples in, close lid
- Put 65 degrees C for 15 minutes
- Put heat on and press enter
- Remember to turn off the heat when done!
- Prepare the gel
- Create a gel as usual (50 ml of Agar stuff, 5 ul of SYBR Safe DNA Stain)
- Put these ingredients together
- 25 ul of digest
- 6 ul of LB
____ ____ ____ ____ ____ ____ ____ ____ 1V 1I 2V 2I 3V 3I U L dd dd d xBa1 xBa1 xBa1 EcoR1 EcoR1
- L (Ladder)
- 1kb Ladder 2ul
- Loading Buffer 6 ul
- H20 22 ul
- Total: 30 ul because 1kb ladder is 500 ng/ul
- U (Undigested)
- 5 ul DNA
- 6.25 ul Loading Buffer
- 19 ul H20
- Total: 30.25
- Gel run at 85 volts for 45 min
Protocol for Purifying DNA from Agarose Gel
- Remove DNA fragment from agarose gel with razor blade
- Weigh slice in colorless tube, add 3 volumes Buffer QG or QX1 to 1 volume of gel (100mg ~ 100ul)
- Dissolve gel by incubate at 55 degree C temp block. vortex every 3 minutes until dissolved
- Make sure solution is yellow, if not consult Qiagen guidebook
- To bind DNA apply sample to a spin column and centrifuge for 1 min
- (Optional) Discard flow through and add .5ml Buffer QG and centrifuge for 1 min.
- To wash, add .75ml of PE Buffer and centrifuge for 1 min
- Centrifuge again to spin off excess
- Place column in clean centrifuge tube
- To elute, add 50 ul H20 and centrifuge for 1 min
Ligation
- Best ratio is between 3:1 to 5:1 of insert to backbone
- Use this equation
- [math]\displaystyle{ M_{I} = Moleratio_{\frac{I}{v}} * \frac{bp_{I}}{bp_{v}} * M_{vector} }[/math]
- Usually want [math]\displaystyle{ M_{v} }[/math] to be between 20ng and 100ng
- Once we solve for [math]\displaystyle{ M_{i} }[/math] we should multiply it by between 3-5 to get the appropriate ratio
- Actual Calculation for a 4:1 ratio
We decide m_v = 40 ng and rearrange the equation. 4695/720 = m_v / m_I * 4 m_I = 24.61 ng
[math]\displaystyle{ \frac{4695}{720}=\frac{m_{v}}{m_{I}} }[/math]
- Reagent List for the Ligations
- ddV
- Double Digested Vector
- ddI
- Double Digested Insert
- dV
- Single Digested Vector
- dI
- Single Digested Insert
- Reagent Amounts
<html><pre> <b>Reactants ddV ddV+ddI dV dV+dI</b> <b>Vector</b> 11 ul 11 ul 4 ul 4ul <b>Insert</b> - 3 ul - 2.5 ul <b>10x Ligation Buffer</b> 2 ul 2ul 2ul 2 ul <b>H2O</b> 6.5 ul 3.5 ul 13.5 ul 11 ul <b>T4 Ligase</b> .5 ul .5 ul .5 ul .5 ul <b>Total</b> 20 ul 20 ul 20 ul 20 ul </pre></html>
- Insert the ligations into a PCR machine and run the IGLIGATE Program
- IGLIGATE -> Tubes -> Volume = 20 ul
- 16 degrees C for 5 hours
- 60 degrees C for 10 minutes to heat kill the enzymes