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| == Function == | | == Function == |
| [https://www.uniprot.org/uniprot/Q9NAV7_9ANNE Q9NAV7_9ANNE] | | [https://www.uniprot.org/uniprot/Q9NAV7_9ANNE Q9NAV7_9ANNE] |
| <div style="background-color:#fffaf0;">
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| == Publication Abstract from PubMed ==
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| The multifunctional catalytic globin dehaloperoxidase (DHP) from the marine worm Amphitrite ornata was shown to catalyze the H2O2-dependent oxidation of 2,4- and 2,6-dihalophenols (DXP; X = F, Cl, Br). Product identification by LC-MS revealed multiple monomeric products with varying degrees of oxidation and/or dehalogenation, as well as oligomers with n up to 6. Mechanistic and (18)O-labeling studies demonstrated sequential dihalophenol oxidation via peroxidase and peroxygenase activities. Binding studies established that 2,4-DXP (X = Cl, Br) have the highest affinities of any known DHP substrate. X-ray crystallography identified different binding positions for 2,4- and 2,6-DXP substrates in the hydrophobic distal pocket of DHP. Correlation between the number of halogens and the substrate binding orientation revealed a halogen-dependent binding motif for mono- (4-halophenol), di- (2,4- and 2,6-dihalophenol) and trihalophenols (2,4,6-trihalopenol). Taken together, the findings here on dihalophenol reactivity with DHP advance our understanding of how these compounds bridge the inhibitory and oxidative functions of their mono- and trihalophenol counterparts, respectively, and provide further insight into the protein structure-function paradigm relevant to multifunctional catalytic globins in comparison to their monofunctional analogs.
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| Bridging the functional gap between reactivity and inhibition in dehaloperoxidase B from Amphitrite ornata: Mechanistic and structural studies with 2,4- and 2,6-dihalophenols.,Malewschik T, Carey LM, de Serrano V, Ghiladi RA J Inorg Biochem. 2022 Jul 25;236:111944. doi: 10.1016/j.jinorgbio.2022.111944. PMID:35969974<ref>PMID:35969974</ref>
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| From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
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| </div>
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| <div class="pdbe-citations 7m1j" style="background-color:#fffaf0;"></div>
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| ==See Also== | | ==See Also== |
| *[[Dehaloperoxidase 3D structures|Dehaloperoxidase 3D structures]] | | *[[Dehaloperoxidase 3D structures|Dehaloperoxidase 3D structures]] |
| == References ==
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| <references/>
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| __TOC__ | | __TOC__ |
| </StructureSection> | | </StructureSection> |
