Paul.xu at 15:15, 5 March 2012

2012-03-05T15:15:23Z

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== Taq Inactivation modif ==

[[Image:PKAalpha--02-07-2012.jpg|290x266px|PKAalpha--02-07-2012.jpg]]

Samples: 15 ul from  300 mM  imidazole elution fractions (3 ml each) 

MW ladder: 250, 130, 100, 70(red), 55, 35, 25(red), 15, 10(green) 

FERMENTAS PageRulerâ¢ Plus Prestained Protein Ladder 

Gel: Invitrogen NuPAGE Bis-Tris NuPAGE 4-12%, 1.0 mm X 10 wells 

Buffer:  1X Mes-Tris-SDS. (50 mM Mes, 50 mM Tris, 0.1% SDS, 1 mM EDTA, pH7.3), diluted from 20 X Mes-SDS-Running buffer from Boston BioProducts 

Stain: Invitrogen Simple Blue 

Destain: water. 

== pSpeedET-PKAalpha, Top10, 0.02% arabinose, RT (25 ~30 oC) o/n. ==

Cells:'''Top10''' transformed with pSpeedET-PKAalpha and chaperone plasmids (2011). Recover single colony on LB/K/Chl plate by streaking from glycerol stock. 

Culture conditions:

Innoculate 1 L LB/K/Chl with a single colony of Top10 cells from plate (streak from glycerol stock). Grow o/n.

Next day add 100 ml culture to 1 L LB/K/Chl, grow at 37 oC. 

Grow cells in 1 L LB/K/Chl to about OD600 = 0.8 at 37 oC, then cool down to RT. 

Induction: induce at RT with 1 ml of 10% arabinose to 1 L culture and induce overnight 

Pellet: some dead cells (black) 

 

{| cellspacing="1" cellpadding="1" border="1" style="width: 455px; height: 80px;"
|-
| Name
| PGn7
| PGKJE8
| PKJE7
| PTf16
| PG-Tf2
|-
| Weight (g)
| 2.6
| 1.3
| 0.9
| 1.1
| 3.7
|}

combined pellets 

Lysis: Freeze and thaw one time, add lysis 50 ml buffer and 30 ul lysozyme (lysozyme did not seem to produce sticky DNA. Looks like most cells are dead), use sonicator to disrupt cells.

Preclear: Centrifuge 12000 rpm for 15 min, then 25000 rpm for 20 min.

Purification Conditions: 

add 10 ml Ni beads to clarified supernatant, incubate (rotary) for 1 hour in cold room, spin down beads at 1000 rpm for 1 min, remove supernatant, transfer beads to glass column. 

Manual step gradient, wash (20 mM imidazole) , elute (300 mM imidazole), collect 3 ml fractions 

Dialysis: 1 X TBS, 50% glycerol, 70 ml, 6 hours,   change buffer then dialyse o/n. 

'''Protein'''

Buffer: 1 X TBS, 50% glycerol 

Name on Label: 

Lot number on Label:

Storage: 80 oC freezer (storage room) in a freezer box labeled as "Purified PKAalpha Protein, 2/2012" 

Total vol:

Total amount of protein mg:

Concentration:

Size: 

Total number of tubes: 

Purity: 

[[Image:PKAAlapha 2 10 2012.jpg]] 

Samples: 15 ul from 300 mM imidazole elution fractions (combined) 

MW ladder: 

ProteinOne

Gel: Invitrogen Bis-Tris NuPAGE 4-12%, 10 wells

Buffer:  

Stain: ProteinOne

Destain: water. 

== pSpeedET-PKAalpha, NiCo21, 0.02% arabinose, 37 oC, 4 hours. ==

Cells: NiCo21 transformed with pSpeedET-PKAalpha. Grow on LB/K plate o/n 

Culture conditions:

Innoculate 1 L LB/K/Chl with a single colony. Grow o/n.

Next day add 100 ml culture to 1 L LB/K/Chl, grow at 37 oC.

Grow cells in 1 L LB/K/Chl to about OD600 = 0.8 at 37 oC.

Induction: induce at RT with 1 ml of 10% arabinose to 1 L culture and induce 4 hours 

Pellet: white with very little dead cells, total wet weight from 6 L: 18 g 

Lysis: Freeze and thaw one time, cells were completely lysed after one freeze-thawing cycle. Use homogenizer to break sticky genomic DNA. 

Preclear: Centrifuge 12000 rpm for 15 min, resuspend pellet in lysis buffer, homogenize, and spin again at 12000 rpm for 15 min. Combine supernatant and spin at 25000 rpm for 20 min.

Purification Conditions:

add 10 ml Ni beads to clarified supernatant, incubate in a beaker with stir bar for 1 hour in cold room, spin down beads at 1000 rpm for 1 min, collect supernatant (do not discard), transfer beads to a glass column using washing buffer (20 mM imidazole).

Manual step gradient, wash (20 mM imidazole) until no detectable protein, elute (300 mM imidazole), collect 3 ml fractions

Dialyse: 1 X TBS, 50% glycerol, 6 hours, change buffer then dialyse o/n. 

'''Protein'''

Buffer: 1 X TBS, 50% glycerol 

Name on Label: 

Lot number on Label: 

Storage: 80 oC freezer (storage room) in a freezer box labeled as "Purified PKAalpha Protein, 2/2012"

Total vol:

Total amount of protein mg:

Concentration:

Size:

Total number of tubes: 

Purity: 

[[Image:PKAalpha 2 13 2012.jpg]] 

Samples: 15 ul from 300 mM imidazole elution fractions (combined)

MW ladder:

ProteinOne

Gel: Invitrogen Bis-Tris NuPAGE 4-12%, 10 wells

Buffer: 

Stain: ProteinOne

Destain: water. 

 

== Buffers ==

Lysis Buffer: 

Wash Buffer: 

Elution Buffer: 

Dialysis Buffer: 

[[Category:Protein_Purification]]

Taq Purification March 2012 - Revision history

Paul.xu at 15:15, 5 March 2012