9gi7
Hen Egg-White Lysozyme (HEWL) complexed with a Lindqvist-type hexavanadate (V6-OH) polyoxometalate
Structural highlights
FunctionLYSC_CHICK Lysozymes have primarily a bacteriolytic function; those in tissues and body fluids are associated with the monocyte-macrophage system and enhance the activity of immunoagents. Has bacteriolytic activity against M.luteus.[1] Publication Abstract from PubMedUnderstanding the impact of oxidative modification on protein structure and functions is essential for developing therapeutic strategies to combat macromolecular damage and cell death. However, selectively inducing oxidative modifications in proteins under physiological conditions remains challenging. Herein we demonstrate that [V(6)O(13)(OCH(2))(3)CCH(2)OH(2)](2-) (V(6)-OH) hybrid metal-oxo cluster can be used for selective protein oxidative cleavage and modifications. We present the first example of a protein-bound hybrid vanadate cluster, where its interactions with protein surfaces and the redox activity of vanadium enable selective oxidative modifications. Single Crystal X-ray Diffraction (SC-XRD) of the V(6)-OH and hen egg white lysozyme (HEWL) complex revealed that the binding is dictated both by the inorganic core and the organic ligands attached to it. Selective oxidation or cleavage of HEWL occurs under physiological conditions by producing reactive oxygen species (ROS) in presence of ascorbate (Asc) as a reducing agent. The outcome of the oxidative reaction can be tuned by varying the concentration of V(6)-OH to result either in selective oxidation of the amino acid side chains or peptide bond cleavage. LC-MS and crystallography revealed that oxidative modifications were mainly concentrated near the cluster binding sites, providing spatial control of ROS production. This study advances our understanding of vanadium's role in biological systems and demonstrates the potential of hybrid metal-oxo clusters in protein modification. Discrete Hybrid Vanadium-oxo Cluster as a Targeted Tool for Selective Protein Oxidative Modifications and Cleavage.,Moussawi MA, de Azambuja F, Parac-Vogt TN Angew Chem Int Ed Engl. 2025 Jan 10:e202423078. doi: 10.1002/anie.202423078. PMID:39792069[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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