6jgx

Crystal structure of the transcriptional regulator CadR from P. putida in complex with Cadmium(II) and DNA

spinqualitylabelsall models 6jgx, resolution 2.71Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6jgx is a 4 chain structure with sequence from Pseudomonas putida. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.71Å Ligands: CD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q93TP7_PSEPU Publication Abstract from PubMed Detoxification of the highly toxic cadmium element is essential for the survival of living organisms. Pseudomonas putida CadR, a MerR family transcriptional regulator, has been reported to exhibit an ultraspecific response to the cadmium ion. Our crystallographic and spectroscopic studies reveal that the extra cadmium selectivity of CadR is mediated by the unexpected cooperation of thiolate-rich site I and histidine-rich site II. Cadmium binding in site I mediates the reorientation of protein domains and facilitates the assembly of site II. Subsequently, site II bridge-links 2 DNA binding domains through ligands His140/His145 in the C-terminal histidine-rich tail. With dynamic transit between 2 conformational states, this bridge could stabilize the regulator into an optimal conformation that is critical for enhancing the transcriptional activity of the cadmium detoxification system. Our results provide dynamic insight into how nature utilizes the unique cooperative binding mechanism in multisite proteins to recognize cadmium ions specifically. Selective cadmium regulation mediated by a cooperative binding mechanism in CadR.,Liu X, Hu Q, Yang J, Huang S, Wei T, Chen W, He Y, Wang D, Liu Z, Wang K, Gan J, Chen H Proc Natl Acad Sci U S A. 2019 Oct 8;116(41):20398-20403. doi:, 10.1073/pnas.1908610116. Epub 2019 Sep 23. PMID:31548408 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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