6x7e

Co-bound structure of an engineered protein trimer, TriCyt3, with delta isomerism at the hexahistidine coordination site

spinqualitylabelsall models 6x7e, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6x7e is a 3 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9987Å Ligands: CL, CO, HEC, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function C562_ECOLX Electron-transport protein of unknown function. Publication Abstract from PubMed <div class="abstract"> <div><p class="Abstract" style="margin: 0in 0in 0.25in; text-align: justify; line-height: 11.25pt; font-size: 8pt; font-family: Arial, sans-serif; caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">To mimic a hypothetical pathway for protein evolution, we previously developed a design strategy (Metal-Templated Interface Redesign), in which a monomeric protein (cytochrome&nbsp;<i>cb<sub>5</sub></i><sub>62&l t;/sub>) was tailored for metal-mediated self-assembly, followed by the re-design of the resulting oligomers for enhanced stability and metal-based functions. Here we show that a single hydrophobic mutation on the cytochrome&nbsp;<i>cb</i><sub>562</sub>&nbsp;surf ace can drastically alter the outcome of metal-directed oligomerization to yield a new trimeric architecture, (TriCyt1)<sub>3</sub>, featuring an unusual hexa-histidine coordination motif. Through computational and rational redesign, this nascent trimer is converted into second and third-generation variants (TriCyt2)<sub>3</sub>&nbsp;and (TriCyt3)<sub>3</sub>&nbsp;with increased structural stability and preorganization for metal coordination. The three TriCyt variants combined furnish a unique design platform to a) provide tunable coupling between protein quaternary structure and metal coordination, b) enable the construction of metal/pH-switchable protein oligomerization motifs, and c) generate a robust metal coordination site that can accommodate all mid-to-late first-row transition metal ions with high affinity, including Mn(II) with nanomolar dissociation constants,&nbsp;&nbsp;rivaling those of the strongest Mn(II)-binding protein, calprotectin.&nbsp;<span lang="EN-GB" style="color: red;"><o:p></o:p></span></p> </div> </div>. Metal-Templated Design of Chemically Switchable Protein Assemblies with High-Affinity Coordination Sites.,Tezcan FA, Kakkis A, Gagnon D, Esselborn J, Britt RD Angew Chem Int Ed Engl. 2020 Aug 23. doi: 10.1002/anie.202009226. PMID:32830423 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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