title: Crystal structure of TTC0263, a thermophilic TPR protein from Thermus thermophilus HB27.
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 A with R-factors of R/Rfree = 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.
authors.affiliation: College of Medicine, Seoul National University, Seoul 110-799, Korea.
authors.forename: Hyosun
authors.initials: H
authors.lastname: Lim
authors.forename: Kyunggon
authors.initials: K
authors.lastname: Kim
authors.forename: Dohyun
authors.initials: D
authors.lastname: Han
authors.forename: Jongkil
authors.initials: J
authors.lastname: Oh
authors.forename: Youngsoo
authors.initials: Y
authors.lastname: Kim
mesh_terms: D020816:Amino Acid Motifs; D000596:Amino Acids / Q000032:analysis; D001426:Bacterial Proteins / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D008958:Models, Molecular; D016963:Thermus thermophilus / Q000737:chemistry*
chemical_list: D000596:Amino Acids; D001426:Bacterial Proteins