Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites.
Lecerof, David LU ; Fodje, Michel LU ; Alvarez León, Román ; Olsson, Ulf LU ; Hansson, Andreas LU ; Sigfridsson, Emma ; Ryde, Ulf LU
; Hansson, Mats
LU
and Al-Karadaghi, Salam
LU
(2003)
In Journal of Biological Inorganic Chemistry
8(4).
p.452-458
- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/128485
- author
- Lecerof, David
LU
; Fodje, Michel
LU
; Alvarez León, Román
; Olsson, Ulf
LU
; Hansson, Andreas
LU
; Sigfridsson, Emma
; Ryde, Ulf
LU
; Hansson, Mats
LU
and Al-Karadaghi, Salam
LU
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Biological Inorganic Chemistry
- volume
- 8
- issue
- 4
- pages
- 452 - 458
- publisher
- Springer
- external identifiers
-
- pmid:12761666
- wos:000183036300009
- scopus:0037613378
- ISSN
- 1432-1327
- DOI
- 10.1007/s00775-002-0436-1
- language
- English
- LU publication?
- yes
- additional info
- 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)
- id
- 726d88bd-5298-4a1c-8615-a5b487334ca0 (old id 128485)
- date added to LUP
- 2016-04-01 11:34:44
- date last changed
- 2023-01-24 02:30:30
@article{726d88bd-5298-4a1c-8615-a5b487334ca0,
abstract = {{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.}},
author = {{Lecerof, David and Fodje, Michel and Alvarez León, Román and Olsson, Ulf and Hansson, Andreas and Sigfridsson, Emma and Ryde, Ulf and Hansson, Mats and Al-Karadaghi, Salam}},
issn = {{1432-1327}},
language = {{eng}},
number = {{4}},
pages = {{452--458}},
publisher = {{Springer}},
series = {{Journal of Biological Inorganic Chemistry}},
title = {{Metal binding to Bacillus subtilis ferrochelatase and interaction between metal sites.}},
url = {{https://lup.lub.lu.se/search/files/135491219/56_fczn.pdf}},
doi = {{10.1007/s00775-002-0436-1}},
volume = {{8}},
year = {{2003}},
}