2xiw | pdb_00002xiw

Crystal structure of the Sac7d-derived IgG1-binder C3-C24S

spinqualitylabelsall models 2xiw, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2xiw is a 2 chain structure with sequence from Atcc 33909. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, SO4 NonStd Res: MSE Related: 1wtp, 1wtq, 1sap, 1bf4, 1azq, 1xyi, 1wto, 1wvl, 1azp, 1ca5, 1wtw, 1wtx, 1wd1, 1wtv, 1ca6, 1xx8, 1wd0, 1wtr Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [DN71_SULAC] Constrain negative DNA supercoils; may be involved in maintaining the integrity of their genome at high temperature. Publication Abstract from PubMed Engineered protein scaffolds have received considerable attention as alternatives to antibodies in both basic and applied research, as they can offer superior biophysical properties often associated with a simpler molecular organization. Sac7d has been demonstrated as an effective scaffold for molecular recognition. Here, we used the initial L1 'flat surface' library constructed by randomization of 14 residues, to identify ligands specific for human immunoglobulin G. To challenge the plasticity of the Sac7d protein scaffold, we designed the alternative L2 'flat surface & loops' library whereof only 10 residues are randomized. Representative binders (Affitins) of the two libraries exhibited affinities in the low nanomolar range and were able to recognize different epitopes within human immunoglobulin G. These Affitins were stable up to pH 12 while largely conserving other favorable properties of Sac7d protein, such as high expression yields in Escherichia coli, solubility, thermal stability up to 80.7 degrees C, and acidic stability (pH 0). In agreement with our library designs, mutagenesis study revealed two distinct binding areas, one including loops. Together, our results indicate that the Sac7d scaffold tolerates alternative library designs, which further expands the diversity of Affitins and may provide a general way to create tailored affinity tools for demanding applications. Tolerance of the archaeal Sac7d scaffold protein to alternative library designs: characterization of anti-immunoglobulin G Affitins.,Behar G, Bellinzoni M, Maillasson M, Paillard-Laurance L, Alzari PM, He X, Mouratou B, Pecorari F Protein Eng Des Sel. 2013 Jan 11. PMID:23315487 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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