1kmt

Crystal structure of RhoGDI Glu(154,155)Ala mutant

spinqualitylabelsall models 1kmt, resolution 1.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1kmt is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [GDIR1_HUMAN] Regulates the GDP/GTP exchange reaction of the Rho proteins by inhibiting the dissociation of GDP from them, and the subsequent binding of GTP to them. In glioma cells, inhibits cell migration and invasion by mediating the signals of SEMA5A and PLXNB3 that lead to inactivation of RAC1 (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 It is hypothesized that surface residues with high conformational entropy, specifically lysines and glutamates, impede protein crystallization. In a previous study using a model system of Rho-specific guanine nucleotide dissociation inhibitor (RhoGDI), it was shown that mutating Lys residues to Ala results in enhanced crystallizability, particularly when clusters of lysines are targeted. It was also shown that one of these mutants formed crystals that yielded diffraction to 2.0 A, a significant improvement on the wild-type protein crystals. In the current paper, an analysis of the impact of surface mutations replacing Glu residues with Ala or Asp on the stability and crystallization properties of RhoGDI is presented. The Glu-->Ala (Asp) mutants are generally more likely to produce crystals of the protein than the wild-type and in one case the resulting crystals yielded a diffraction pattern to 1.2 A resolution. This occurs in spite of the fact that mutating surface Glu residues almost invariably affects the protein's stability, as illustrated by the reduced deltaG between folded and unfolded forms measured by isothermal equilibrium denaturation. The present study strongly supports the notion that rational surface mutagenesis can be an effective tool in overcoming problems stemming from the protein's recalcitrance to crystallization and may also yield dramatic improvements in crystal quality. The impact of Glu-->Ala and Glu-->Asp mutations on the crystallization properties of RhoGDI: the structure of RhoGDI at 1.3 A resolution.,Mateja A, Devedjiev Y, Krowarsch D, Longenecker K, Dauter Z, Otlewski J, Derewenda ZS Acta Crystallogr D Biol Crystallogr. 2002 Dec;58(Pt 12):1983-91. Epub 2002, Nov 23. PMID:12454455 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Guanine nucleotide dissociation inhibitor

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