Is it possible to isolate both RNA and recombinant 6xHis-tagged protein from the same sample?

We have no experimental data for this application. However, buffer RLT of the RNeasy Kits for RNA isolation does not contain substances incompatible with Ni-NTA purification of His-tagged proteins. It should be possible to first extract RNA from a sample by following the RNeasy procedure, save the flow-through from the binding step as well as from the RW1 wash, and apply the combined fractions onto a Ni-NTA column for binding of His-tagged proteins. Follow our recommendations for purification of 6xHis-tagged proteins using Ni-NTA resins outlined in the QIAexpressionist handbook.
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