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Douglas, N.R., Reissmann, S., Zhang, J., Chen, B., Ja-kana, J., Kumar, R., Chiu, W. and Frydman, J. (2011) Dual action of ATP hydrolysis couples lid closure to substrate release into the group II chaperonin chamber. Cell, 144, 240-252. doi:10.1016/j.cell.2010.12.017

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• TITLE: Cytosolic chaperonin CCT possesses GTPase activity

  AUTHORS: Susumu Noguchi, Kazuyoshi Toyoshima, Soh Yamamoto, Toshio Miyazaki, Michiro Otaka, Sumio Watanabe, Katsunori Imai, Haruki Senoo, Ryoji Kobayashi, Mitsutoshi Jikei, Yasushi Kawata, Hiroshi Kubota, Hideaki Itoh

  KEYWORDS: Chaperonin; Molecular Chaperone; Protein Folding, Gtp

  JOURNAL NAME: American Journal of Molecular Biology, Vol.1 No.3, October 11, 2011

  ABSTRACT: Cytosolic chaperonin CCT (also known as TRiC) is a hetero-oligomeric cage-like molecular chaperone that assists in protein folding by ATPase cycle-dependent conformational changes. However, role of the nucleo-tide binding and hydrolysis in CCT-assisted protein folding is still poorly understood. We purified CCT by using ATP-Sepharose and other columns, and found that CCT possesses ability to hydrolyze GTP, with an activity level very similar to the ATPase activity. CCT was more resistant to proteinase K treatment in the presence of GTP or ATP. These results suggest that the GTPase activity of CCT may play a role in chaperone-assisted protein folding.