Team:BYU Provo/Notebook/Phage Purification/Winterexp/Period1/Exp/8.14 T4 CsCl Gradient

Phage Purification

March-April

May-June

July-August

September-October

Further purify the phage to a high level of purification.

II) Expected Outcome

Purified and viable phage will be extracted from the CsCl gradient.

III) Reagants Used

T4 mutant phage

CsCl

dialysis tubing

phage suspension buffer

IV) Actual Procedure

Create different concentrations of CsCl solutions to create a gradient.

Add 1.64 g of CsCl to 4 mL of phage suspension buffer to create a 1.3 g/ml density gradient.

Add 2.3466 g of CsCl to 4 mL of phage suspension buffer to create a 1.43 g/ml density gradient.

Add 3.6840 g of CsCl to 6 mL of phage suspension buffer to create a 1.45 g/ml density gradient.

Add 3.8483 g of CsCl to 6 mL of phage suspension buffer to create a 1.47 g/ml density gradient.

Add 4.0978 g of CsCl to 6 mL of phage suspension buffer to create a 1.5003 g/ml density gradient.

Add 2.7362 g of CsCl to 4 mL of phage suspension buffer to create a 1.5011 g/ml density gradient.

Add 2.7406 g of CsCl to 4 mL of phage suspension buffer to create a 1.5019 g/ml density gradient.

Add 4.1159 g of CsCl to 6 mL of phage suspension buffer to create a 1.5025 g/ml density gradient.

Add 2.7489 g of CsCl to 4 mL of phage suspension buffer to create a 1.5034 g/ml density gradient.

Add 4.1283 g of CsCl to 6 mL of phage suspension buffer to create a 1.5040 g/ml density gradient.

Add 4.9222 g of CsCl to 6 mL of phage suspension buffer to create a 1.6 g/ml density gradient.

Add 5.7549 g of CsCl to 6 mL of phage suspension buffer to create a 1.7 g/ml density gradient.

Layer the gradient into two centrifuge tubes, using half of the total volume created for each tube. For example, add 2 mL of 1.3 density to one tube and the other 2 mL to another tube.

Fill the remaining space in the tube with phage suspension buffer to the top.

Centrifuge at 26500 rpms (100,000 g) for 2.5 hours.

Extract using a needle and puncturing the side of the tube, placing the needle underneath the band.

Place phage in dialysis tubing and place in flask with 1 L of phage suspension buffer for 30 minutes at 4^◦ C.

Repeat previous step three more times.

Remove purified phage from dialysis tubing and store in 4^◦ C.

V) Results

The phage banded at 1.45 (upper Faint Band - possibly small mutated phage) and made a large band between 1.5019 and 1.5025 (possibly mutated large phage closer to 1.5025 with normal phage at 1.5019). The control had a faint band at 1.5019.