Matt Gethers/CRI, Thailand/Labwork/Binding Assay/8.8.08 Run Notes

8.8.08 Binding Assay Run

Volumes and Concentrations of Constituents	Volume	Final Concentration	Volume removed for next dilution	Final Volume
8.44 μl of stock protein (assume 90 μM monomer) in 29.55 μl of 1x buffer (+DTT)	38 μl	20 μM	18 μl	20 μl
18 μl of 20 μM protein in 18 μl of 1x buffer (+DTT)	36 μl	10 μM	16 μl	20 μl
16 μl of 10 μM protein in 16 μl of 1x buffer (+DTT)	32 μl	5 μM	12 μl	20 μl
12 μl of 5 μM protein in 18 μl of 1x buffer (+DTT)	30 μl	2 μM	10 μl	20 μl
10 μl of 2 μM protein in 10 μl of 1x buffer (+DTT)	20 μl	1 μM	0 μl	20 μl

Made up a stock of 10x buffer with DTT: 16.3 μl 10x buffer and 1.63 μl 1 M DTT - (DTT is 10x as concentrated as before). Diluted in water as follows:

Dilution for which buffer is intended	Dilution Final Volume	Volume Buffer + DTT Stock added	Volume water added	Final volume of Buffer+water
20 μM	38 μl	4.18 μl	25.375	29.55
10 μM	36 μl	3.96 μl	14.04 μl	18 μl
5 μM	32 μl	3.52 μl	12.48 μl	16 μl
2 μM	30 μl	3.3 μl	14.7 μl	18 μl
1 μM	20 μl	2.2 μl	7.8 μl	10 μl

I put the dilutions on ice and then prepared the FA cuvettes with the following: Add 900 μl water, 100 μl 10x buffer, 1 μl 0.5 mg/ml polydIdC, and 10 μl 1 M DTT (again note that this DTT concentration is 10x last time). To one cuvette, I added 1 μl of 10 μM HmgA probe. To the second (everything else being the same), I added the same amount of Gpx1 probe. Used HmgR (purified 7.14.08) to titrate.

Data

August 8, 2008 HmgR* Data