Daniel:Notebook/ComboLock/2016-10-17
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BSA Ab-Oligo Linkage (From Friday)
Friday I accidentally let the post-sulfo SMCC reaction elute into the wash container, which probably messed things up. So I'm repeating that part of the experiment and will mix the new Ab fraction with the oligo fraction prepared on Friday.
Protocol
- Buffer Prep
- Mix 1.4 mL of monobasic and 3.6 mL of dibasic and 45 mL ddH2O to make 50 mL of 100 mM (buffer pH 7.2)
- Antibody Activation
- Resuspend antibodies at 1 mg/mL in PBS
- Equilibrate a 40 kDa spin column (or plate) 4 times with 100 mM phosphate buffer, pH 7.3; 250 uL, spin at 1000xg for 2 min
- Add 20 uL antibody to the column and spin for 3 min at 1000xg; collect in a new plate
- Dissolve sulfo-SMCC to 3.33 mM in 100mM phosphate buffer
- Add 2 uL sulfo-SMCC to sample and incubate for 2 hr at 4C with 3 times intermittent mixing
- Equilibrate a new 40 kDa column with 100 mM phosphate buffer with 20 mM EDTA
- Transfer antibodies to new column and spin for 3 min at 1000xg
- Oligonucleotide Activation
- Ab-Oligo Mixing
- Mix SMCC-treated antibodies with DTT-treated oligonucleotides at 10X molar excess of oligo to Ab
- Transfer to pre-wet Slide-A-Lyzer Mini 7 MWCO dialysis cup
- Dialyze in 1 L PBS with 5 mM EDTA at 4C for 2 days with one buffer exchange to PBS
- Dilute probes to 75 ug/mL in PBS buffer with 4 mM EDTA, 35 ug/mL ssDNA, 0.1% fish gelatin, and 20 mM Tris HCl
- Store at 4C