7a58

NOE-only solution structure of the Iron-Sulfur protein PioC from Rhodopseudomonas palustris TIE-1

spinqualitylabelsall models 7a58 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 20 models Ligands: SF4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Metalloproteins play key roles across biology, and knowledge of their structure is essential to understand their physiological role. For those metalloproteins containing paramagnetic states, the enhanced relaxation caused by the unpaired electrons often makes signal detection unfeasible near the metal center, precluding adequate structural characterization right where it is more biochemically relevant. Here, we report a protein structure determination by NMR where two different sets of restraints, one containing Nuclear Overhauser Enhancements (NOEs) and another containing Paramagnetic Relaxation Enhancements (PREs), are used separately and eventually together. The protein PioC from Rhodopseudomonas palustris TIE-1 is a High Potential Iron-Sulfur Protein (HiPIP) where the [4Fe-4S] cluster is paramagnetic in both oxidation states at room temperature providing the source of PREs used as alternative distance restraints. Comparison of the family of structures obtained using NOEs only, PREs only and the combination of both reveals that the pairwise root-mean-square deviation (RMSD) between them are similar and comparable with the precision within each family. This demonstrates that, under favorable conditions in terms of protein size and paramagnetic effects, PREs can efficiently complement and eventually replace NOEs for the structural characterization of small paramagnetic metalloproteins and denovo designed metalloproteins by NMR. PRE-driven Protein NMR Structures: an Alternative Approach in Highly Paramagnetic Systems.,Trindade IB, Invernici M, Cantini F, Louro RO, Piccioli M FEBS J. 2020 Oct 30. doi: 10.1111/febs.15615. PMID:33124176 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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