User:Keyun Wang/Notebook/Experimental Biological Chemistry I/2012/11/06

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Purpose

  • Protein was extracted from transfected BL21(DE3) E.coli cells and adenosine deaminase was purified via column chromatography.
  • Adenosine deaminase plasmid with the mutation E34K was transformed into BL21(DE3) E.coli cells with a second attempt.
  • UV-vis spectroscopy was used to analyze Au/Lysozyme solutions made on 2012/10/31 to measure absorbance of supernatant of Au/Lysozyme samples

Procedure for Protein Extraction and Purification from BL21(DE3) Cells

  • Frozen BL21(DE3) E.coli cells from 2012/11/04 were taken out from the freezer with gloves.
  • The frozen cells were placed into a 500mL beaker filled with ~30°C of warm tap water for 10 minutes. After 10 minutes, cells are completely thawed and appeared in liquid form.
  • On ice bath, the cells were sonicated in three 1 minute intervals with three repeated cycles of procedures below:
    • Cells are sonicated under 8mV for 30 seconds with ______Sonicator.
    • Cells are immediately placed on ice for 30 seconds
  • After sanitation, the E.coli cells were transferred from a 25mL falcon tube into a 30mL centrifuge tube. Another 30mL centrifuge tube was filled with water with weight equal to the weight of 30mL centrifuge tube containing cellular sample.

Result for Protein Extraction and Purification from BL21(DE3) Cells

Au/Lysozyme ratio Observation of solution
20pale and transparent purple, no fibers are formed
30pale and transparent purple, no fibers are formed
40pale and transparent purple, no fibers are formed
50transparent purple in color, no fibers are formed
60medium transparent purple in color, no fibers are formed
70Clear supernatant, purple fibers formed aggregating at the bottom of test tube
80Clear supernatant, purple fibers formed aggregating at the bottom of test tube. Some fibers were floating in supernatant.
100Clear supernatant, purple fibers formed aggregating at the bottom of test tube. Some fibers were floating in supernatant.
120Clear supernatant, purple fibers formed aggregating at the bottom of test tube. Some fibers were floating in supernatant.
130Clear supernatant, purple fibers formed aggregating at the bottom of test tube



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