Expression and purification of the CMR (Type III-B) complex in Sulfolobus solfataricus

Jing Zhang, Malcolm F White

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Protein purification is an important technique that allows us to characterize the structural and biochemical properties of either an individual protein or a multi-protein complex. However, expression and purification of one subunit of a complex in the absence of its binding partners has often proven difficult to achieve due to the issues such as instability and mis-folding. This is the case for the components of the CRISPR-Cas interference complexes, which degrade invading nucleic acids in a sequence homology-dependent manner in many prokaryotic species. Here, we describe the expression of a tandem-tagged subunit of the Type III-B (CMR) complex in Sulfolobus solfataricus and subsequent isolation and purification of the whole complex by affinity purification of the tagged subunit.
Original languageEnglish
Pages (from-to)185-94
Number of pages10
JournalMethods in Molecular Biology
Publication statusPublished - 2015


  • Affinity purification
  • Hyperthermophile
  • Tandem tags
  • Protein complex
  • Viral shuttle vector


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