2dfy
From Proteopedia
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Crystal structure of a cyclized protein fusion of LMO4 LIM domains 1 and 2 with the LIM interacting domain of LDB1
Overview
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.
About this Structure
2DFY is a Single protein structure of sequence from Mus musculus with ZN and GOL as ligands. Full crystallographic information is available from OCA.
Reference
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
Page seeded by OCA on Wed Nov 21 09:35:46 2007
