Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Crystal Structure of TTC0263, a Thermophilic TPR Protein from Thermus thermophilus HB27

  • Lim, Hyosun (College of Medicine, Seoul National University) ;
  • Kim, Kyunggon (College of Medicine, Seoul National University) ;
  • Han, Dohyun (College of Medicine, Seoul National University) ;
  • Oh, Jongkil (College of Medicine, Seoul National University) ;
  • Kim, Youngsoo (College of Medicine, Seoul National University)
  • Received : 2006.10.20
  • Accepted : 2007.04.30
  • Published : 2007.08.31
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Abstract

The hypothetical protein TTC0263 of Thermus thermophilus HB27 is a thermophilic tetratricopeptide repeat (TPR)-containing protein. In the present study, the TPR region (residues 26-230) was resolved at $2.5{\AA}$ with R-factors of $R/R_{free}$ = 23.6%/28.6% $R/R_{free}=23.6%/28.6%$. TTC0263 consists of 11 helices that form five TPR units. Uniquely, it contains one atypical "extended" TPR (eTPR) unit. This comprises extended helical residues near the loop region of TTC0263, such that the helical length of eTPR is longer than that of the canonical TPR sequence. In addition, the hybrid TPR domain of TTC0263 possesses oligomer-forming characteristics. TPR domains are generally involved in forming multi-subunit complexes by interacting with each other or with other subunit proteins. The dynamic structure of TTC0263 described here goes some way to explaining how TPR domains mediate the formation of multi-subunit complexes.

Keywords

Acknowledgement

Supported by : Korea Research Foundation, Ministry of Health & Welfare

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