7jgu | pdb_00007jgu

Structure of FN3tt mut

spinqualitylabelsall models 7jgu, resolution 1.20Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7jgu is a 1 chain structure with sequence from Cals4. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 1PE Related: 7jgt Gene: TTE0165 (CALS4) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed This study uses differential scanning calorimetry, X-ray crystallography and molecular dynamics simulations to investigate the structural basis for the high thermal stability (melting temperature 97.5 degrees C) of a FN3-like protein domain from thermophilic bacteria Thermoanaerobacter tengcongensis (FN3tt). FN3tt adopts a typical FN3 fold with a three-stranded beta sheet packing against a four-stranded beta sheet. We identified three solvent exposed arginine residues (R23, R25 and R72), which stabilize the protein through salt bridge interactions with glutamic acid residues on adjacent strands. Alanine mutation of the three arginine residues reduced melting temperature by up to 22 degrees C. Crystal structures of the wild type and a thermally destabilized (Tm -19.7 degrees C) triple mutant (R23L/R25T/R72I) were found to be nearly identical, suggesting that the destabilization is due to interactions of the arginine residues. Molecular dynamics simulations showed that the salt bridge interactions in the wild type were stable and provided a dynamical explanation for the cooperativity observed between R23 and R25 based on calorimetry measurements. In addition, folding free energy changes computed using free energy perturbation molecular dynamics simulations showed high correlation with melting temperature changes. This work is another example of surface salt bridges contributing to the enhanced thermal stability of thermophilic proteins. The molecular dynamics simulation methods employed in this study may be broadly useful for in silico surface charge engineering of proteins. This article is protected by copyright. All rights reserved. Surface Salt bridges Contribute to the Extreme Thermal Stability of an FN3-like domain from a thermophilic bacterium.,Boucher L, Somani S, Negron C, Ma W, Jacobs S, Chan W, Malia T, Obmolova G, Teplyakov A, Gilliland GL, Luo J Proteins. 2021 Aug 18. doi: 10.1002/prot.26218. PMID:34405904 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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