3F9P

Crystal structure of myeloperoxidase from human leukocytes

Summary for 3F9P

• Entry DOI: 10.2210/pdb3f9p/pdb
• Descriptor: Myeloperoxidase, beta-D-mannopyranose-(1-3)-[beta-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose, CHLORIDE ION, ... (8 entities in total)
• Functional Keywords: imidazolate, myeloperoxidase, heme to protein linkage, peroxidase-cyclooxygenase superfamily, disease mutation, glycoprotein, hydrogen peroxide, iron, lysosome, metal-binding, oxidation, oxidoreductase, disulfide bond, heme, peroxidase
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 4
• Total formula weight: 136932.35

Authors

Carpena, X.,Fita, I.,Obinger, C. (deposition date: 2008-11-14, release date: 2009-07-14, Last modification date: 2024-12-25)

Primary citation

Carpena, X.,Vidossich, P.,Schroettner, K.,Calisto, B.M.,Banerjee, S.,Stampler, J.,Soudi, M.,Furtmuller, P.G.,Rovira, C.,Fita, I.,Obinger, C.
Essential role of proximal histidine-asparagine interaction in Mammalian peroxidases.
J.Biol.Chem., 284:25929-25937, 2009

PubMed Abstract: In heme enzymes belonging to the peroxidase-cyclooxygenase superfamily the proximal histidine is in close interaction with a fully conserved asparagine. The crystal structure of a mixture of glycoforms of myeloperoxidase (MPO) purified from granules of human leukocytes prompted us to revise the orientation of this asparagine and the protonation status of the proximal histidine. The data we present contrast with previous MPO structures, but are strongly supported by molecular dynamics simulations. Moreover, comprehensive analysis of published lactoperoxidase structures suggest that the described proximal heme architecture is a general structural feature of animal heme peroxidases. Its importance is underlined by the fact that the MPO variant N421D, recombinantly expressed in mammalian cell lines, exhibited modified spectral properties and diminished catalytic activity compared with wild-type recombinant MPO. It completely lost its ability to oxidize chloride to hypochlorous acid, which is a characteristic feature of MPO and essential for its role in host defense. The presented crystal structure of MPO revealed further important differences compared with the published structures including the extent of glycosylation, interaction between light and heavy polypeptides, as well as heme to protein covalent bonds. These data are discussed with respect to biosynthesis and post-translational maturation of MPO as well as to its peculiar biochemical and biophysical properties.

PubMed: 19608745
DOI: 10.1074/jbc.M109.002154

Experimental method

X-RAY DIFFRACTION (2.93 Å)