Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites.

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Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites. / Lecerof, David; Fodje, Michel; Alvarez León, Román; Olsson, Ulf; Hansson, Andreas; Sigfridsson, Emma; Ryde, Ulf; Hansson, Mats; Al-Karadaghi, Salam.

I: Journal of Biological Inorganic Chemistry, Vol. 8, Nr. 4, 2003, s. 452-458.

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Lecerof, David ; Fodje, Michel ; Alvarez León, Román ; Olsson, Ulf ; Hansson, Andreas ; Sigfridsson, Emma ; Ryde, Ulf ; Hansson, Mats ; Al-Karadaghi, Salam. / Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites. I: Journal of Biological Inorganic Chemistry. 2003 ; Vol. 8, Nr. 4. s. 452-458.

RIS

TY - JOUR

T1 - Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites.

AU - Lecerof, David

AU - Fodje, Michel

AU - Alvarez León, Román

AU - Olsson, Ulf

AU - Hansson, Andreas

AU - Sigfridsson, Emma

AU - Ryde, Ulf

AU - Hansson, Mats

AU - Al-Karadaghi, Salam

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Theoretical Chemistry (S) (011001039), Physical Chemistry 1 (S) (011001006), Biochemistry and Structural Biology (S) (000006142)

PY - 2003

Y1 - 2003

N2 - 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 Zn2+, which is commonly used as substrate in assays of the ferrochelatase reaction, and Cd2+, 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, Mg2+, which has been shown to bind close to the surface at 7 Å from His183, was largely absent from its site. Activity measurements demonstrate that Mg2+ has a stimulatory effect on the enzyme, lowering KM for Zn2+ from 55 to 24 µM. Changing one of the Mg2+ binding residues, Glu272, to serine abolishes the effect of Mg2+. 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 Mg2+ site may stimulate metal release from the protein ligands and its insertion into the porphyrin.

AB - 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 Zn2+, which is commonly used as substrate in assays of the ferrochelatase reaction, and Cd2+, 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, Mg2+, which has been shown to bind close to the surface at 7 Å from His183, was largely absent from its site. Activity measurements demonstrate that Mg2+ has a stimulatory effect on the enzyme, lowering KM for Zn2+ from 55 to 24 µM. Changing one of the Mg2+ binding residues, Glu272, to serine abolishes the effect of Mg2+. 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 Mg2+ site may stimulate metal release from the protein ligands and its insertion into the porphyrin.

U2 - 10.1007/s00775-002-0436-1

DO - 10.1007/s00775-002-0436-1

M3 - Article

VL - 8

SP - 452

EP - 458

JO - Journal of Biological Inorganic Chemistry

JF - Journal of Biological Inorganic Chemistry

SN - 1432-1327

IS - 4

ER -