1nm0
Proteus mirabilis catalase in complex with formiate
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OverviewOverview
The structure of Proteus mirabilis catalase in complex with an inhibitor, formic acid, has been solved at 2.3 A resolution. Formic acid is a key, ligand of catalase because of its ability to react with the ferric enzyme, giving a high-spin iron complex. Alternatively, it can react with two, transient oxidized intermediates of the enzymatic mechanism, compounds I, and II. In this work, the structures of native P. mirabilis catalase (PMC), and compound I have also been determined at high resolution (2.0 and 2.5, A, respectively) from frozen crystals. Comparisons between these three PMC, structures show that a water molecule present at a distance of 3.5 A from, the haem iron in the resting state is absent in the formic acid complex, but reappears in compound I. In addition, movements of solvent molecules, are observed during formation of compound I in a cavity located away from, the active site, in which a glycerol molecule is replaced by a sulfate., These results give structural insights into the movement of solvent, molecules, which may be important in the enzymatic reaction.
About this StructureAbout this Structure
1NM0 is a Single protein structure of sequence from Proteus mirabilis with SO4, HEM, FMT and GOL as ligands. Active as Catalase, with EC number 1.11.1.6 Full crystallographic information is available from OCA.
ReferenceReference
Structural studies of Proteus mirabilis catalase in its ground state, oxidized state and in complex with formic acid., Andreoletti P, Pernoud A, Sainz G, Gouet P, Jouve HM, Acta Crystallogr D Biol Crystallogr. 2003 Dec;59(Pt 12):2163-8. Epub 2003, Nov 27. PMID:14646074
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