7p8r

X-ray structure of the adduct of a vanadium picolinate complex with RNase A at pH 5.1

spinqualitylabelsall models 7p8r, resolution 1.27Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.27Å Ligands: AIV, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The structure, stability, and enzymatic activity of the adduct formed upon the reaction of the V-picolinato (pic) complex [V(IV)O(pic)2(H2O)], with an octahedral geometry and the water ligand in cis to the V horizontal lineO group, with the bovine pancreatic ribonuclease (RNase A) were studied. While electrospray ionization-mass spectrometry, circular dichroism, and ultraviolet-visible absorption spectroscopy substantiate the interaction between the metal moiety and RNase A, electron paramagnetic resonance (EPR) allows us to determine that a carboxylate group, stemming from Asp or Glu residues, and imidazole nitrogen from His residues are involved in the V binding at acidic and physiological pH, respectively. Crystallographic data demonstrate that the V(IV)O(pic)2 moiety coordinates the side chain of Glu111 of RNase A, by substituting the equatorial water molecule at acidic pH. Computational methods confirm that Glu111 is the most affine residue and interacts favorably with the OC-6-23-Delta enantiomer establishing an extended network of hydrogen bonds and van der Waals stabilizations. By increasing the pH around neutrality, with the deprotonation of histidine side chains, the binding of the V complex to His105 and His119 could occur, with that to His105 which should be preferred when compared to that to the catalytically important His119. The binding of the V compound affects the enzymatic activity of RNase A, but it does not alter its overall structure and stability. Spectroscopic/Computational Characterization and the X-ray Structure of the Adduct of the V(IV)O-Picolinato Complex with RNase A.,Ferraro G, Demitri N, Vitale L, Sciortino G, Sanna D, Ugone V, Garribba E, Merlino A Inorg Chem. 2021 Dec 20;60(24):19098-19109. doi: 10.1021/acs.inorgchem.1c02912., Epub 2021 Nov 30. PMID:34847328 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ribonuclease 3D structures

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