how to concentrate Co-IP protein sample

Dr Engelbert Buxbaum engelbert_buxbaum at
Fri Mar 19 09:12:47 EST 2004

"Zhonglin Chai" wrote:

> Alternatively, you may cross-link your Ab to the Protein A or
> G beads and repeatedly use it to do IP in multiple lysates if you don't
> like the large volume IP.

Or use killed bacteria expressing Protein A. Such preparation are
commercially available,I had good success with Pansorbin (no

You may also consider using metabolically labelled protein, by
expressing your proteins in the presence of 35S cys/met. Fluorographies
of these gels detect really minute amounts of protein.

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