6nl7

Crystal structure of B1 immunoglobulin-binding domain of Streptococcal Protein G (T16F, T18A, V21H, T25H, K28Y, V29I, K31R, Q32A, Y33L, N35K, D36A, N37Q)

spinqualitylabelsall models 6nl7, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6nl7 is a 4 chain structure with sequence from 9stre. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, CL, DPO, NA, PO4, ZN Related: 1pga, 3fil Gene: spg (9STRE) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The ability to precisely control protein complex formation has high utility in the expanding field of biomaterials. Driving protein-protein binding through metal-ligand bridging interactions is a promising method of achieving this goal. Furthermore, the capacity to precisely regulate both complex formation and dissociation enables additional control not available with constitutive protein complexes. Here we describe the design of three metal-controlled protein dimers that are completely monomeric in the absence of metal yet form high-affinity symmetric homodimers in the presence of zinc sulfate. The scaffold used for the designed dimers is the beta1 domain of streptococcal protein G. In addition to forming high-affinity dimers in the presence of metal, the complexes also dissociate upon addition of EDTA. Biophysical characterization revealed that the proteins maintain relatively high thermal stability, bind with high affinity, and are completely monodisperse in the monomeric and dimeric states. High-resolution crystal structures revealed that the dimers adopt the target structure and that the designed metal-binding histidine residues successfully bind zinc and function to drive dimer formation. Design of High-Affinity Metal-Controlled Protein Dimers.,Maniaci B, Lipper CH, Anipindi DL, Erlandsen H, Cole JL, Stec B, Huxford T, Love JJ Biochemistry. 2019 Apr 30;58(17):2199-2207. doi: 10.1021/acs.biochem.9b00055., Epub 2019 Apr 12. PMID:30938154 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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