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2 results for “Protein structure, X-ray diffraction images”
Body temperature protein X-ray crystallography at 37°C: A rhenium protein complex seeking a physiological condition structure: Raw Diffraction Images (112 week soak) Zenodo
<p>The labratory dataset of the raw diffraction images obtained after 112 weeks of soaking in the mother liquor and collected at a wavelength of 1.54 Å, illustrating the covalent coordination of the rhenium(I) tricarbonyl fragment to the His and Asp amino acid residues as well as other similarities when comparing the 37°C data set to 100K data set as described in the publication titled "Body temperature protein X-ray crystallography at 37°C: A rhenium protein complex seeking a physiological condition structure", written by Jacobs, Helliwell & Brink,<em> ChemComm</em>, 2024.</p> <p>The raw diffraction images for the labratory data sets are made available at the Zenodo research data archive, as specified in the publication.</p>
The 1.1 Å Structure of the Periplasmic Phosphate-Binding Protein from Stenotrophomonas maltophilia - a crystallisation contaminant identified by molecular replacement using the entire protein database (X-ray diffraction images).
<p>During efforts to crystallise the enzyme 2,4-dihydroxyacetophenone dioxygenase (DAD) from <em>Alcaligenes</em> sp. 4HAP, a small number of strongly diffracting protein crystals were obtained after two years of crystal growth in one condition. The crystals diffracted synchrotron radiation to almost 1.0 Å resolution and were, until recently, assumed to be formed by the DAD protein. However, when another crystal form of this enzyme was eventually solved at lower resolution, molecular replacement using this structure as the search model did not give a convincing solution with the original atomic resolution dataset. Hence we considered that these crystals might be due to a protein impurity, although molecular replacement using the structures of common crystallisation contaminants as search models again failed. A script to perform molecular replacement using MOLREP (Vagin, A. & Teplyakov, A. (2010). Acta Crystallogr. D 66, 22-25.) in which the first chain of every structure in the PDB was used as a search model was run on a multi-core cluster. This identified a number of prokaryotic phosphate binding proteins as scoring highly in the MOLREP peak lists. Calculation of an electron density map at 1.1 Å resolution allowed most of the amino acids to be identified visually and built into the model. A BLAST search then indicated that the molecule was most probably a phosphate binding protein from <em>Stenotrophomonas maltophilia</em> (UniProt ID: B4SL31; gene ID: Smal_2208) and fitting of the corresponding sequence to the atomic resolution map fully corroborated this. Proteins in this family have been linked with the virulence of antibiotic resistant strains of pathogenic bacteria and with biofilm formation. The structure has been refined to an R-factor of 10.15 % and an R-free of 12.46 % at 1.1 Å resolution. The molecule adopts the type-II periplasmic binding protein fold with a number of extensively elaborated loop regions. A fully-dehydrated phosphate anion is bound tightly between the two domains of the protein and interacts with conserved residues and a number of helix dipoles. </p>
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