1n0i

Crystal Structure of Ferrochelatase with Cadmium bound at active site

spinqualitylabelsall models 1n0i, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1n0i is a 1 chain structure with sequence from "bacillus_globigii"_migula_1900 "bacillus globigii" migula 1900. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CD, CL, MG Related: 1doz, 1c1h, 1ld3, 1c9e Activity: Ferrochelatase, with EC number 4.99.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [HEMH_BACSU] Catalyzes the ferrous insertion into protoporphyrin IX. 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 Ferrochelatase, the terminal enzyme in heme biosynthesis, catalyses metal insertion into protoporphyrin IX. The location of the metal binding site with respect to the bound porphyrin substrate and the mode of metal binding are of central importance for understanding the mechanism of porphyrin metallation. In this work we demonstrate that Zn(2+), which is commonly used as substrate in assays of the ferrochelatase reaction, and Cd(2+), an inhibitor of the enzyme, bind to the invariant amino acids His183 and Glu264 and water molecules, all located within the porphyrin binding cleft. On the other hand, Mg(2+), which has been shown to bind close to the surface at 7 A from His183, was largely absent from its site. Activity measurements demonstrate that Mg(2+) has a stimulatory effect on the enzyme, lowering K(M) for Zn(2+) from 55 to 24 micro M. Changing one of the Mg(2+) binding residues, Glu272, to serine abolishes the effect of Mg(2+). It is proposed that prior to metal insertion the metal may form a sitting-atop (SAT) complex with the invariant His-Glu couple and the porphyrin. Metal binding to the Mg(2+) site may stimulate metal release from the protein ligands and its insertion into the porphyrin. Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites.,Lecerof D, Fodje MN, Alvarez Leon R, Olsson U, Hansson A, Sigfridsson E, Ryde U, Hansson M, Al-Karadaghi S J Biol Inorg Chem. 2003 Apr;8(4):452-8. Epub 2003 Jan 18. PMID:12761666 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Ferrochelatase 3D structures

Proteopedia Page Contributors and Editors (what is this?)

OCA