2hre
Structure of human ferrochelatase variant E343K with protoporphyrin IX bound
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OverviewOverview
Ferrochelatase, the terminal enzyme in heme biosynthesis, catalyzes the, insertion of ferrous iron into protoporphyrin IX to form protoheme IX., Human ferrochelatase is a homodimeric, inner mitochondrial, membrane-associated enzyme that possesses an essential [2Fe-2S] cluster., In this work, we report the crystal structure of human ferrochelatase with, the substrate protoporphyrin IX bound as well as a higher resolution, structure of the R115L variant without bound substrate. The data presented, reveal that the porphyrin substrate is bound deep within an enclosed, pocket. When compared with the location of N-methylmesoporphyrin in the, Bacillus subtilis ferrochelatase, the porphyrin is rotated by, approximately 100 degrees and is buried an additional 4.5 A deeper within, the active site. The propionate groups of the substrate do not protrude, into solvent and are bound in a manner similar to what has been observed, in uroporphyrinogen decarboxylase. Furthermore, in the substrate-bound, form, the jaws of the active site mouth are closed so that the porphyrin, substrate is completely engulfed in the pocket. These data provide, insights that will aid in the determination of the mechanism for, ferrochelatase.
DiseaseDisease
Known diseases associated with this structure: Protoporphyria, erythropoietic OMIM:[177000], Protoporphyria, erythropoietic, recessive, with liver failure OMIM:[177000]
About this StructureAbout this Structure
2HRE is a Single protein structure of sequence from Homo sapiens with PP9, CHD and FES as ligands. Active as Ferrochelatase, with EC number 4.99.1.1 Full crystallographic information is available from OCA.
ReferenceReference
Substrate interactions with human ferrochelatase., Medlock A, Swartz L, Dailey TA, Dailey HA, Lanzilotta WN, Proc Natl Acad Sci U S A. 2007 Feb 6;104(6):1789-93. Epub 2007 Jan 29. PMID:17261801
Page seeded by OCA on Mon Nov 12 22:35:31 2007