3bj9

Crystal structure of the Surrogate Light Chain Variable Domain VpreBJ

spinqualitylabelsall models 3bj9, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3bj9 is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: EDO Gene: VPREB1, VPREB (HUMAN) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [VPREB_HUMAN] Associates with the Ig-mu chain to form a molecular complex that is expressed on the surface of pre-B-cells. This complex presumably regulates Ig gene rearrangements in the early steps of B-cell differentiation. 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 surrogate light chain (SLC) is a key regulator of B cell development in the bone marrow, resulting in mature B cells that produce antibodies that are capable of interacting with antigens. The SLC comprises two noncovalently interacting proteins: VpreB and 14.1. We engineered a construct to represent the complete immunoglobulin-like domain of the SLC variable domain in a single protein chain that could be bacterially expressed. In this construct, the incomplete immunoglobulin domain of VpreB (residues 1-102) was linked to the J-segment of 14.1 (residues 40-53), which provided one beta-strand to complete the V-like domain (VpreBJ). Because VpreBJ has the interface to VH chains, but lacks the unique region of 14.1, which is important for SLC signaling, we predict that a properly folded VpreBJ would have the potential to act as a dominant negative mutant of the surrogate light chain. X-ray crystallography of VpreBJ at 2.0 A resolution showed that the engineering was successful. With its two beta-pleated sheets, packed face-to-face, the single chain VpreBJ resembles a mature light chain immunoglobulin V-domain (VL). The surface that would normally interact with the VH chain interacts with a crystallographically related VpreBJ molecule. The presence of dimeric species in solution was verified by analytical ultracentrifugation. VpreBJ is easily overexpressed in bacteria, while retaining the native conformation of an immunoglobulin domain, and thus may serve as an important reagent for future studies in B-cell development. Engineering and characterization of a single chain surrogate light chain variable domain.,Morstadt L, Bohm A, Yuksel D, Kumar K, Stollar BD, Baleja JD Protein Sci. 2008 Mar;17(3):458-65. PMID:18287279 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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