1iph | pdb_00001iph

STRUCTURE OF CATALASE HPII FROM ESCHERICHIA COLI

spinqualitylabelsall models 1iph, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1iph is a 4 chain structure with sequence from Escherichia coli. The September 2004 RCSB PDB Molecule of the Month feature on Catalase by David S. Goodsell is 10.2210/rcsb_pdb/mom_2004_9. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: HEM Activity: Catalase, with EC number 1.11.1.6 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed BACKGROUND: Catalase is a ubiquitous enzyme present in both the prokaryotic and eukaryotic cells of aerobic organisms. It serves, in part, to protect the cell from the toxic effects of small peroxides. Escherichia coli produces two catalases, HPI and HPII, that are quite distinct from other catalases in physical structure and catalytic properties. HPII, studied in this work, is encoded by the katE gene, and has been characterized as an oligomeric, monofunctional catalase containing one cis-heme d prosthetic group per subunit of 753 residues. RESULTS: The crystal structure of catalase HPII from E. coli has been determined to 2.8 A resolution. The asymmetric unit of the crystal contains a whole molecule, which is a tetramer with accurate 222 point group symmetry. In the model built, that includes residues 27-753 and one heme group per monomer, strict non-crystallographic symmetry has been maintained. The crystallographic agreement R-factor is 20.1% for 58,477 reflections in the resolution shell 8.0-2.8 A. CONCLUSIONS: Despite differences in size and chemical properties, which were suggestive of a unique catalase, the deduced structure of HPII is related to the structure of catalase from Penicillium vitale, whose sequence is not yet known. In particular, both molecules have an additional C-terminal domain that is absent in the bovine catalase. This extra domain contains a Rossmann fold but no bound nucleotides have been detected, and its physiological role is unknown. In HPII, the heme group is modified to a heme d and inverted with respect to the orientation determined in all previously reported heme catalases. HPII is the largest catalase for which the structure has been determined to almost atomic resolution. Crystal structure of catalase HPII from Escherichia coli.,Bravo J, Verdaguer N, Tormo J, Betzel C, Switala J, Loewen PC, Fita I Structure. 1995 May 15;3(5):491-502. PMID:7663946 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Catalase

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