How to pase my Co-IP over the weekend? - (Jan/27/2010 )
I am probably have to collect my transfected cells on Friday for a Co-IP exp, now I need to decide what to do is the best. I can:
1. Lyse the cells on Friday, pre-clear lysate and incubate with primary antibodies over the weekend at 4C;
2. Freeze cell pellets on Friday, continue Co-IP next Monday;
3. Keep pellets on 4C, and do Co-IP on Monday.
I usually perform Co-IP without freeze and thaw, fearing that it will cause my proteins of interest to dissociate. But I also wonder if it will cause too much background or deterioration of proteins if I choose (1), please advice, thank you!!
I would really not recommend doing this over the weekend. Unspecific binding, protein degradation or alteration are highly likely to occur. As I suppose from what you say that you can't do the experiment on the weekend, here's what I would do. Let's call it a "quicker than normal IP".
1- Lyse the cells in the morning.
2- Preclear 1-2 hours at 4 C.
3- Ab + Protein extract for 1 hour.
4- Add beads for 1-2 hours.
5- Wash and elute.