Chain: A
Fragment: Kh-Qua2 Region, Residues 82-215
Synonym: Quaking Protein
Engineered: Yes
Organism_common: African Clawed Frog
Organism_taxid: 8355
Expression_system: Escherichia Coli
Expression_system_taxid: 469008
Expression_system_strain: Bl21(De3)
Other_details: Gene Expression Was Induced By The Addition Of Iptg To A Final Concentration Of 0.5 Mm And The Cells Were Incubated For 3 H At 37 Degrees C. The Cells Were Harvested By Centrifugation At 6000 Rpm For 20 Min And Stored At -20 Degrees C Until Required. The Cells Were Resuspended In Te Buffer (Containing 1 Mm Edta, 25 Mm Tris) At Ph 8.0 And Then Broken In A French Press. The Cell Debris Was Removed By Centrifugation At 40000 G For 30 Min, Following Which The Pellet Was Resuspended In 50 Ml Of 20 Mm Sodium Phosphate Containing 10 Per Cent Triton X-100 And 100 Mm Sodium Chloride. The Crude Extract Was Added To 6 Ml Of Ni-Nta Resin (Qiagen), Mixed For 2 H At 4 Degrees C, Spun Down At 5000 G For 10 Min And The Supernatant Discarded. The Beads Were Loaded On To A Column, Washed With 2 Volumes Of Resuspension Buffer And Then 2 Volumes Of Elution Buffer (Containing 500 Mm Imidazole, 50 Mm Sodium Chloride And 20 Mm Sodium Phosphate). The Eluate Was Desalted On A Sephadex G-25 Pd-10 Column (Pharmacia) And Then Concentrated To 1 Mm Using A Biomax 10k Membrane To A Final Volume Of 500 Microlitres. The Protein Product Corresponds To Residues 81 To 214 Of Full Length Pxqua, With A C-Terminal His6 Extension
Ontology
| Chain | Function | Process | Component |
| A |
