2dfy

Crystal structure of a cyclized protein fusion of LMO4 LIM domains 1 and 2 with the LIM interacting domain of LDB1

spinqualitylabelsall models 2dfy, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2dfy is a 2 chain structure with sequence from Lk3 transgenic mice. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [LMO4_MOUSE] Probable transcriptional factor. 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 study of protein-protein interactions can be hampered by the instability of one or more of the protein complex components. In this study, we showed that intein-mediated cyclization can be used to engineer an artificial intramolecular cyclic protein complex between two interacting proteins: the largely unstable LIM-only protein 4 (LMO4) and an unstructured domain of LIM domain binding protein 1 (ldb1). The X-ray structure of the cyclic complex is identical to noncyclized versions of the complex. Chemical and thermal denaturation assays using intrinsic tryptophan fluorescence and dynamic light scattering were used to compare the relative stabilities of the cyclized complex, the intermolecular (or free) complex, and two linear versions of the intramolecular complex (in which the interacting domains of LMO4 and ldb1 were fused, via a flexible linker, in either orientation). In terms of resistance to denaturation, the cyclic complex is the most stable variant and the intermolecular complex is the least stable; however, the two linear intramolecular variants show significant differences in stability. These differences appear to be related to the relative contact order (the average distance in sequence between residues that make contacts within a structure) of key binding residues at the interface of the two proteins. Thus, the restriction of the more stable component of a complex may enhance stability to a greater extent than restraining less stable components. Stabilization of a binary protein complex by intein-mediated cyclization.,Jeffries CM, Graham SC, Stokes PH, Collyer CA, Guss JM, Matthews JM Protein Sci. 2006 Nov;15(11):2612-8. Epub 2006 Sep 25. PMID:17001033 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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