2c1u: Difference between revisions
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==Overview== | ==Overview== | ||
Bacterial cytochrome c peroxidases contain an electron transferring (E), heme domain and a peroxidatic (P) heme domain. All but one of these, enzymes are isolated in an inactive oxidized state and require reduction, of the E heme by a small redox donor protein in order to activate the P, heme. Here we present the structures of the inactive oxidized and active, mixed valence enzyme from Paracoccus pantotrophus. Chain flexibility in, the former, as expressed by the crystallographic temperature factors, is, strikingly distributed in certain loop regions, and these coincide with, the regions of conformational change that occur in forming the active, mixed valence enzyme. On the basis of these changes, we postulate a series, of events that occur to link the trigger of the electron entering the | Bacterial cytochrome c peroxidases contain an electron transferring (E), heme domain and a peroxidatic (P) heme domain. All but one of these, enzymes are isolated in an inactive oxidized state and require reduction, of the E heme by a small redox donor protein in order to activate the P, heme. Here we present the structures of the inactive oxidized and active, mixed valence enzyme from Paracoccus pantotrophus. Chain flexibility in, the former, as expressed by the crystallographic temperature factors, is, strikingly distributed in certain loop regions, and these coincide with, the regions of conformational change that occur in forming the active, mixed valence enzyme. On the basis of these changes, we postulate a series, of events that occur to link the trigger of the electron entering the E, heme from either pseudoazurin or cytochrome c(550) and the dissociation of, a coordinating histidine at the P heme, which allows substrate access. | ||
==About this Structure== | ==About this Structure== | ||
2C1U is a | 2C1U is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Paracoccus_pantotrophus Paracoccus pantotrophus] with CA and HEC as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Cytochrome-c_peroxidase Cytochrome-c peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.5 1.11.1.5] Structure known Active Site: AC1. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2C1U OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: peroxidase]] | [[Category: peroxidase]] | ||
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Revision as of 16:12, 5 November 2007
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CRYSTAL STRUCTURE OF THE DI-HAEM CYTOCHROME C PEROXIDASE FROM PARACOCCUS PANTOTROPHUS- OXIDISED FORM
OverviewOverview
Bacterial cytochrome c peroxidases contain an electron transferring (E), heme domain and a peroxidatic (P) heme domain. All but one of these, enzymes are isolated in an inactive oxidized state and require reduction, of the E heme by a small redox donor protein in order to activate the P, heme. Here we present the structures of the inactive oxidized and active, mixed valence enzyme from Paracoccus pantotrophus. Chain flexibility in, the former, as expressed by the crystallographic temperature factors, is, strikingly distributed in certain loop regions, and these coincide with, the regions of conformational change that occur in forming the active, mixed valence enzyme. On the basis of these changes, we postulate a series, of events that occur to link the trigger of the electron entering the E, heme from either pseudoazurin or cytochrome c(550) and the dissociation of, a coordinating histidine at the P heme, which allows substrate access.
About this StructureAbout this Structure
2C1U is a Single protein structure of sequence from Paracoccus pantotrophus with CA and HEC as ligands. Active as Cytochrome-c peroxidase, with EC number 1.11.1.5 Structure known Active Site: AC1. Full crystallographic information is available from OCA.
ReferenceReference
Activation and catalysis of the di-heme cytochrome c peroxidase from Paracoccus pantotrophus., Echalier A, Goodhew CF, Pettigrew GW, Fulop V, Structure. 2006 Jan;14(1):107-17. PMID:16407070
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