title: Structure of dehaloperoxidase B at 1.58 A resolution and structural characterization of the AB dimer from Amphitrite ornata.
abstract: As members of the globin superfamily, dehaloperoxidase (DHP) isoenzymes A and B from the marine annelid Amphitrite ornata possess hemoglobin function, but they also exhibit a biologically relevant peroxidase activity that is capable of converting 2,4,6-trihalophenols to the corresponding 2,6-dihaloquinones in the presence of hydrogen peroxide. Here, a comprehensive structural study of recombinant DHP B, both by itself and cocrystallized with isoenzyme A, using X-ray diffraction is presented. The structure of DHP B refined to 1.58 A resolution exhibits the same distal histidine (His55) conformational flexibility as that observed in isoenzyme A, as well as additional changes to the distal and proximal hydrogen-bonding networks. Furthermore, preliminary characterization of the DHP AB heterodimer is presented, which exhibits differences in the AB interface that are not observed in the A-only or B-only homodimers. These structural investigations of DHP B provide insights that may relate to the mechanistic details of the H(2)O(2)-dependent oxidative dehalogenation reaction catalyzed by dehaloperoxidase, present a clearer description of the function of specific residues in DHP at the molecular level and lead to a better understanding of the paradigms of globin structure-function relationships.
authors.affiliation: North Carolina State University, USA.
authors.forename: Vesna
authors.initials: V
authors.lastname: de Serrano
authors.forename: Jennifer
authors.initials: J
authors.lastname: D'Antonio
authors.forename: Stefan
authors.initials: S
authors.lastname: Franzen
authors.forename: Reza A
authors.initials: RA
authors.lastname: Ghiladi
mesh_terms: D000818:Animals; D018360:Crystallography, X-Ray; D006454:Hemoglobins / Q000737:chemistry* / Q000378:metabolism; D006639:Histidine / Q000737:chemistry; D007527:Isoenzymes / Q000737:chemistry / Q000378:metabolism; D008958:Models, Molecular; D010544:Peroxidases / Q000737:chemistry* / Q000378:metabolism; D011077:Polychaeta / Q000201:enzymology*; D011487:Protein Conformation
chemical_list: D006454:Hemoglobins; D007527:Isoenzymes; D006639:Histidine; C098661:DHP I dehaloperoxidase; D010544:Peroxidases
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