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• W2783132301 abstract "Approximately 11% of enzymes contain a transition metal ion that is essential for catalytic function. Such metalloenzymes catalyze much of the most chemically challenging and biologically essential chemistry carried out by life. X-ray-based methods, predominantly macromolecular crystallography (MX) and also X-ray absorption spectroscopy (XAS), have proved essential for determining structures of transition metal ion-containing active sites in order to deduce enzyme catalytic mechanisms. However, X-ray irradiation can induce change in both the oxidation state and structure of the metal, which is problematic in structure determination. We present an XAS study of whether cryoprotectants such as polyethylene glycol (PEG) or glycerol, routinely added to MX or XAS samples to improve data quality, affect photoreduction. Our data demonstrate a remarkable 10-fold exacerbation in rate of photoreduction of Cu(II) to Cu(I) when alcohol or ether cryoprotectants are present. Our results suggest that widespread use of cryoprotectants may increase the potential for erroneous structures." @default.
• W2783132301 created "2018-01-26" @default.
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• W2783132301 date "2018-01-19" @default.
• W2783132301 modified "2023-10-17" @default.
• W2783132301 title "Cryoprotectants Severely Exacerbate X-ray-Induced Photoreduction" @default.
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• W2783132301 doi "https://doi.org/10.1021/acs.jpclett.7b03111" @default.
• W2783132301 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29337573" @default.
• W2783132301 hasPublicationYear "2018" @default.
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