2zqb | pdb_00002zqb

Crystal structure of a psychrotrophic RNaseHI variant with sextuple thermostabilizing mutations

spinqualitylabelsall models 2zqb, resolution 2.49Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2zqb is a 4 chain structure with sequence from Shewanella oneidensis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 Related: 2e4l Activity: Ribonuclease H, with EC number 3.1.26.4 Resources: FirstGlance, OCA, RCSB, PDBsum Function [RNH_SHEON] Endonuclease that specifically degrades the RNA of RNA-DNA hybrids (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The Arg97 --> Gly and Asp136 --> His mutations stabilized So-RNase HI from the psychrotrophic bacterium Shewanella oneidensis MR-1 by 5.4 and 9.7 degrees C, respectively, in T(m), and 3.5 and 6.1 kJ x mol(-1), respectively, in DeltaG(H2O). These mutations also stabilized the So-RNase HI derivative (4x-RNase HI) with quadruple thermostabilizing mutations in an additive manner. As a result, the resultant sextuple mutant protein (6x-RNase HI) was more stable than the wild-type protein by 28.8 degrees C in T(m) and 27.0 kJ x mol(-1) in DeltaG(H2O). To analyse the effects of the mutations on the protein structure, the crystal structure of the 6x-RNase HI protein was determined at 2.5 A resolution. The main chain fold and interactions of the side-chains of the 6x-RNase HI protein were basically identical to those of the wild-type protein, except for the mutation sites. These results indicate that all six mutations independently affect the protein structure, and are consistent with the fact that the thermostabilizing effects of the mutations are roughly additive. The introduction of favourable interactions and the elimination of unfavourable interactions by the mutations contribute to the stabilization of the 6x-RNase HI protein. We propose that So-RNase HI is destabilized when compared with its mesophilic and thermophilic counterparts in a localized fashion by increasing the number of amino acid residues unfavourable for protein stability. Destabilization of psychrotrophic RNase HI in a localized fashion as revealed by mutational and X-ray crystallographic analyses.,Rohman MS, Tadokoro T, Angkawidjaja C, Abe Y, Matsumura H, Koga Y, Takano K, Kanaya S FEBS J. 2009 Jan;276(2):603-13. Epub 2008 Dec 12. PMID:19120449 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease Temp User:Jaime.Prilusky/Test/tree

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