Journal of Microbiology

, Volume 54, Issue 6, pp 440–444 | Cite as

Purification, crystallization, and preliminary X-ray crystallographic analysis of the Group III chaperonin from Carboxydothermus hydrogenoformans

  • Young Jun An
  • Sara E. Rowland
  • Frank T. Robb
  • Sun-Shin ChaEmail author


Chaperonins (CPNs) are megadalton sized ATP-dependent nanomachines that facilitate protein folding through complex cycles of complex allosteric articulation. They consist of two back-to-back stacked multisubunit rings. CPNs are usually classified into Group I and Group II. Here, we report the crystallization of both the AMPPNP (an ATP analogue) and ADP bound forms of a novel CPN, classified as belonging to a third Group, recently discovered in the extreme thermophile Carboxydothermus hydrogenoformans. Crystals of the two forms were grown by the vapor batch crystallization method at 295 K. Crystals of the Ch-CPN/AMPPNP complex diffracted to 3.0 Å resolution and belonged to the space group P422, with unit-cell parameters a = b = 186.166, c = 160.742 Å. Assuming the presence of four molecules in the asymmetric unit, the solvent content was estimated to be about 60.02%. Crystals of the Ch-CPN/ADP complex diffracted to 4.0 Å resolution and belonged to the space group P4212, with unit-cell parameters a = b = 209.780, c = 169.813Å. Assuming the presence of four molecules in the asymmetric unit, the solvent content was estimated to be about 70.19%.


Group III chaperonins protein folding AT-Pfueled nanomachine crystallization 


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Copyright information

© The Microbiological Society of Korea and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Young Jun An
    • 1
  • Sara E. Rowland
    • 2
    • 3
  • Frank T. Robb
    • 2
    • 4
    • 3
  • Sun-Shin Cha
    • 5
    Email author
  1. 1.Korea Institute of Ocean Science and TechnologyAnsanRepublic of Korea
  2. 2.Institute of Marine and Environmental TechnologyBaltimoreUSA
  3. 3.Institute for Bioscience and Biotechnology ResearchRockvilleUSA
  4. 4.Department of Microbiology and ImmunologyUniversity of MarylandBaltimoreUSA
  5. 5.Department of Chemistry and Nano ScienceEwha Womans UniversitySeoulRepublic of Korea

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