Altman:Protocols/Protein Purification/SF9 purification

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(New page: Prepare the following beforehand: Lysis Buffer 200 mM NaCl 4 mM MgCl2 20 mM Imidazole, pH 7.5 0.5 mM EDTA 1 mM EGTA 0.5% Igepal 7% sucrose 1 mM PMSF (0.25 M stock) 10 μg/mL Aprot...)
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==Small-scale purification of FLAG-tagged proteins from SF9 cells==
Prepare the following beforehand:
Prepare the following beforehand:
-
Lysis Buffer  
+
* LYSIS BUFFER
-
 
+
** NOTE: if you are freezing down cells before the purification, leave out the Igepal and Sucrose.  This will require you to make 2x Lysis Buffer without these two ingredients.
-
200 mM NaCl
+
:Final concentrations:
-
4 mM MgCl2
+
::200 mM NaCl
-
20 mM Imidazole, pH 7.5
+
::4 mM MgCl2
-
0.5 mM EDTA
+
::20 mM Imidazole, pH 7.5
-
1 mM EGTA
+
::0.5 mM EDTA
-
0.5% Igepal
+
::1 mM EGTA
-
7% sucrose
+
::0.5% (v/v) Igepal  
-
1 mM PMSF (0.25 M stock)
+
::7% (w/v) Sucrose
-
10 μg/mL Aprotinin  
+
::1 mM PMSF (0.25 M stock)
-
10 μg/mL Leupeptin  
+
::10 μg/mL Aprotinin  
-
5 mM DTT   
+
::10 μg/mL Leupeptin  
-
2 mM ATP
+
::5 mM DTT   
 +
::2 mM ATP
 +
 
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<table id="Table 1" border="1" cellpadding="3" cellspacing="0">
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 +
<tr>
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<th><tt> </tt></th>
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<th><tt>5 mL total </tt></th>
 +
</tr>
 +
 
 +
<tr>
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<th><tt> 2x lysis buffer </tt></th>
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<th><tt> 2.5 mL </tt></th>
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</tr>
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<tr>
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<th><tt> 1 mg/mL aprotinin stock </tt></th>
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<th><tt> 50 uL </tt></th>
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</tr>
 +
 
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<tr>
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<th><tt> 1 mg/mL leupeptin stock </tt></th>
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<th><tt> 50 uL </tt></th>
 +
</tr>
 +
 
 +
 
 +
<tr>
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<th><tt> 1 M DTT </tt></th>
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<th><tt> 25 uL </tt></th>
 +
</tr>
 +
 
 +
<tr>
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<th><tt> 100 mM ATP  </tt></th>
 +
<th><tt> 100 uL </tt></th>
 +
</tr>
 +
 
 +
<tr>
 +
<th><tt> 0.25 M PMSF </tt></th>
 +
<th><tt> 20 uL </tt></th>
 +
</tr>
 +
 
 +
<tr>
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<th><tt> diwater </tt></th>
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<th><tt> 2.255 mL </tt></th>
 +
</tr>
 +
 
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</table>
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 +
* 2x LYSIS BUFFER
 +
:Final Concentrations
 +
::400 mM NaCl
 +
::8 mM MgCl2
 +
::40 mM Imidazole, pH 7.5
 +
::1 mM EDTA
 +
::2 mM EGTA
 +
::1% (v/v) Igepal
 +
::14% (w/v) sucrose
 +
 
 +
<table id="Table 1" border="1" cellpadding="3" cellspacing="0">
 +
 
 +
<tr>
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<th><tt> </tt></th>
 +
<th><tt>20 mL total </tt></th>
 +
</tr>
 +
 
 +
<tr>
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<th><tt> 5 M NaCl </tt></th>
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<th><tt> 1.6 mL </tt></th>
 +
</tr>
 +
 
 +
<tr>
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<th><tt> 1 M MgCl2 </tt></th>
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<th><tt> 160 uL </tt></th>
 +
</tr>
 +
 
 +
<tr>
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<th><tt> I M Imidazole, pH 7.5 </tt></th>
 +
<th><tt> 800 uL </tt></th>
 +
</tr>
 +
 
 +
 
 +
<tr>
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<th><tt> 0.5 M EDTA </tt></th>
 +
<th><tt> 40 uL </tt></th>
 +
</tr>
 +
 
 +
<tr>
 +
<th><tt> 0.5 M EGTA  </tt></th>
 +
<th><tt> 80 uL </tt></th>
 +
</tr>
 +
<tr>
 +
<th><tt> Igepal </tt></th>
 +
<th><tt> 200 uL </tt></th>
 +
</tr>
-
1 mL Assay Buffer
+
<tr>
 +
<th><tt> Sucrose </tt></th>
 +
<th><tt> 2.8 g </tt></th>
 +
</tr>
-
(AB)
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<tr>
-
1 mL Assay Buffer + BSA
+
<th><tt> diwater </tt></th>
 +
<th><tt> raise to 20 mL </tt></th>
 +
</tr>
-
(ABSA)
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</table>
-
10x AB stock 100 uL 100 uL
+
-
100x DTT stock 10 uL 10 uL
+
-
10x BSA stock -- 100 uL
+
-
ddwater 890 uL 790 uL
+

Current revision


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Small-scale purification of FLAG-tagged proteins from SF9 cells

Prepare the following beforehand:

  • LYSIS BUFFER
    • NOTE: if you are freezing down cells before the purification, leave out the Igepal and Sucrose. This will require you to make 2x Lysis Buffer without these two ingredients.
Final concentrations:
200 mM NaCl
4 mM MgCl2
20 mM Imidazole, pH 7.5
0.5 mM EDTA
1 mM EGTA
0.5% (v/v) Igepal
7% (w/v) Sucrose
1 mM PMSF (0.25 M stock)
10 μg/mL Aprotinin
10 μg/mL Leupeptin
5 mM DTT
2 mM ATP
5 mL total
2x lysis buffer 2.5 mL
1 mg/mL aprotinin stock 50 uL
1 mg/mL leupeptin stock 50 uL
1 M DTT 25 uL
100 mM ATP 100 uL
0.25 M PMSF 20 uL
diwater 2.255 mL
  • 2x LYSIS BUFFER
Final Concentrations
400 mM NaCl
8 mM MgCl2
40 mM Imidazole, pH 7.5
1 mM EDTA
2 mM EGTA
1% (v/v) Igepal
14% (w/v) sucrose
20 mL total
5 M NaCl 1.6 mL
1 M MgCl2 160 uL
I M Imidazole, pH 7.5 800 uL
0.5 M EDTA 40 uL
0.5 M EGTA 80 uL
Igepal 200 uL
Sucrose 2.8 g
diwater raise to 20 mL
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