Download MendeleyDirhodium Tetraacetate Binding to Lysozyme at Body Temperature.
Tito, G., Ferraro, G., Merlino, A.(2025) Int J Mol Sci 26
- PubMed: 40724832
- DOI: https://doi.org/10.3390/ijms26146582
- Primary Citation of Related Structures:
9RUV - PubMed Abstract:
Paddlewheel dirhodium complexes are cytotoxic compounds that are also used as catalysts and in the formation of Rh-based artificial metalloenzymes. Low-temperature structures of adducts formed by the model protein hen egg white lysozyme (HEWL) with dirhodium tetraacetate ([Rh 2 (μ-O 2 CCH 3 ) 4 ]) when crystals of the protein were treated with the metal compound at 20 °C demonstrated that [Rh 2 (μ-O 2 CCH 3 ) 4 ] in part breaks down upon reaction with HEWL; dimeric Rh-Rh units bind the side chains of Asp18 and the C-terminal carboxylate, and monometallic fragments coordinate the side chains of Arg14 and His15 in 20% ethylene glycol, 0.100 M sodium acetate at pH 4.5 and 0.600 M sodium nitrate, while dimeric Rh-Rh units bind the side chains of Asn93 and Lys96, the C-terminal carboxylate and Asp101, with monometallic fragments that bind the side chains of Lys33 and His15 in 0.010 M HEPES pH 7.5 and 2.00 M sodium formate. To verify whether the binding of this metallodrug to proteins also occurs at body temperature, crystals of HEWL were grown in 0.010 M HEPES pH 7.5 and 2.00 M sodium formate at 37 °C and soaked with [Rh 2 (μ-O 2 CCH 3 ) 4 ] at the same temperature. X-ray diffraction data collected on these crystals at 37 °C demonstrate that [Rh 2 (μ-O 2 CCH 3 ) 4 ] reacts with proteins at body temperature. The structures of the Rh/HEWL adduct formed at 20 °C (obtained from data collected at 100 K) and at 37 °C under the same experimental conditions are very similar, with metal binding sites that are conserved. However, metal-containing fragment occupancy is higher in the structure obtained at 37 °C, suggesting a role of temperature in defining the protein metalation process.
- Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy.
Organizational Affiliation:
