3mli

2ouf-ds, a disulfide-linked dimer of Helicobacter pylori protein HP0242

spinqualitylabelsall models 3mli, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3mli is a 4 chain structure with sequence from Helicobacter pylori. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.9Å Ligands: CA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O25025_HELPY 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 A very small number of natural proteins have folded configurations in which the polypeptide backbone is knotted. Relatively little is known about the folding energy landscapes of such proteins, or how they have evolved. We explore those questions here by designing a unique knotted protein structure. Biophysical characterization and X-ray crystal structure determination show that the designed protein folds to the intended configuration, tying itself in a knot in the process, and that it folds reversibly. The protein folds to its native, knotted configuration approximately 20 times more slowly than a control protein, which was designed to have a similar tertiary structure but to be unknotted. Preliminary kinetic experiments suggest a complicated folding mechanism, providing opportunities for further characterization. The findings illustrate a situation where a protein is able to successfully traverse a complex folding energy landscape, though the amino acid sequence of the protein has not been subjected to evolutionary pressure for that ability. The success of the design strategy-connecting two monomers of an intertwined homodimer into a single protein chain-supports a model for evolution of knotted structures via gene duplication. Structure and folding of a designed knotted protein.,King NP, Jacobitz AW, Sawaya MR, Goldschmidt L, Yeates TO Proc Natl Acad Sci U S A. 2010 Nov 30;107(48):20732-7. Epub 2010 Nov 10. PMID:21068371 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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