|Protein Science (2005) 14(1):216-23|
|Northeast Structural Genomics Consortium|
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We report herein the NMR structure of Tm0979, a structural proteomics target from Thermotoga maritima. ...
The Tm0979 fold consists of four beta/alpha units, which form a central parallel beta-sheet with strand order 1234. The first three helices pack toward one face of the sheet and the fourth helix packs against the other face. The protein forms a dimer by adjacent parallel packing of the fourth helices sandwiched between the two beta-sheets. This fold is very interesting from several points of view. First, it represents the first structure determination for the DsrH family of conserved hypothetical proteins, which are involved in oxidation of intracellular sulfur but have no defined molecular function. Based on structure and sequence analysis, possible functions are discussed. Second, the fold of Tm0979 most closely resembles YchN-like folds; however the proteins that adopt these folds differ in secondary structural elements and quaternary structure. Comparison of these proteins provides insight into possible mechanisms of evolution of quaternary structure through a simple mechanism of hydrophobicity-changing mutations of one or two residues. Third, the Tm0979 fold is found to be similar to flavodoxin-like folds and beta/alpha barrel proteins, and may provide a link between these very abundant folds and putative ancestral half-barrel proteins.
|Crystallography, X-Ray Protein Structure, Quaternary Protein Structure, Tertiary Dimerization Molecular Sequence Data Sequence Alignment Thermotoga maritima Protein Subunits Proteomics Protein Folding Protein Structure, Secondary Amino Acid Sequence Nuclear Magnetic Resonance, Biomolecular Sequence Homology, Amino Acid Bacterial Proteins Solutions Models, Molecular |
|9 (Last update: 03/25/2017 11:23:09am)|
|Protein Sci. 2005 Jan;14(1):216-23.|