Hauptseite > Publikationsdatenbank > Neutron cryo-crystallography captures the protonation state of ferryl heme in a peroxidase > print

001     188457
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024 7 _ |a 10.1126/science.1254398
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037 _ _ |a FZJ-2015-01833
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|a Casadei, C. M.
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245 _ _ |a Neutron cryo-crystallography captures the protonation state of ferryl heme in a peroxidase
260 _ _ |a Washington, DC [u.a.]
|b American Association for the Advancement of Science64196
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336 7 _ |a Journal Article
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520 _ _ |a Heme enzymes activate oxygen through formation of transient iron-oxo (ferryl) intermediates of the heme iron. A long-standing question has been the nature of the iron-oxygen bond and, in particular, the protonation state. We present neutron structures of the ferric derivative of cytochrome c peroxidase and its ferryl intermediate; these allow direct visualization of protonation states. We demonstrate that the ferryl heme is an Fe(IV)=O species and is not protonated. Comparison of the structures shows that the distal histidine becomes protonated on formation of the ferryl intermediate, which has implications for the understanding of O–O bond cleavage in heme enzymes. The structures highlight the advantages of neutron cryo-crystallography in probing reaction mechanisms and visualizing protonation states in enzyme intermediates.
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