2ghc
From Proteopedia
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|PDB= 2ghc |SIZE=350|CAPTION= <scene name='initialview01'>2ghc</scene>, resolution 1.25Å | |PDB= 2ghc |SIZE=350|CAPTION= <scene name='initialview01'>2ghc</scene>, resolution 1.25Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand= | + | |LIGAND= <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=NO:NITROGEN+OXIDE'>NO</scene> |
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/L-ascorbate_peroxidase L-ascorbate peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.11 1.11.1.11] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/L-ascorbate_peroxidase L-ascorbate peroxidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.11.1.11 1.11.1.11] </span> |
|GENE= ascorbate peroxidase ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3847 Glycine max]) | |GENE= ascorbate peroxidase ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3847 Glycine max]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[2ggn|2GGN]], [[2ghd|2GHD]], [[2ghe|2GHE]], [[2ghh|2GHH]], [[2ghk|2GHK]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ghc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ghc OCA], [http://www.ebi.ac.uk/pdbsum/2ghc PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2ghc RCSB]</span> | ||
}} | }} | ||
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[[Category: Raven, E L.]] | [[Category: Raven, E L.]] | ||
[[Category: Sharp, K H.]] | [[Category: Sharp, K H.]] | ||
| - | [[Category: HEM]] | ||
| - | [[Category: NA]] | ||
| - | [[Category: NO]] | ||
[[Category: orthogonal bundle]] | [[Category: orthogonal bundle]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 03:16:39 2008'' |
Revision as of 00:16, 31 March 2008
| |||||||
| , resolution 1.25Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , , | ||||||
| Gene: | ascorbate peroxidase (Glycine max) | ||||||
| Activity: | L-ascorbate peroxidase, with EC number 1.11.1.11 | ||||||
| Related: | 2GGN, 2GHD, 2GHE, 2GHH, 2GHK
| ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Conformational mobility in the active site of a heme peroxidase
Overview
Conformational mobility of the distal histidine residue has been implicated for several different heme peroxidase enzymes, but unambiguous structural evidence is not available. In this work, we present mechanistic, spectroscopic, and structural evidence for peroxide- and ligand-induced conformational mobility of the distal histidine residue (His-42) in a site-directed variant of ascorbate peroxidase (W41A). In this variant, His-42 binds "on" to the heme in the oxidized form, duplicating the active site structure of the cytochromes b but, in contrast to the cytochromes b, is able to swing "off" the iron during catalysis. This conformational flexibility between the on and off forms is fully reversible and is used as a means to overcome the inherently unreactive nature of the on form toward peroxide, so that essentially complete catalytic activity is maintained. Contrary to the widely adopted view of heme enzyme catalysis, these data indicate that strong coordination of the distal histidine to the heme iron does not automatically undermine catalytic activity. The data add a new dimension to our wider appreciation of structure/activity correlations in other heme enzymes.
About this Structure
2GHC is a Single protein structure of sequence from Glycine max. Full crystallographic information is available from OCA.
Reference
Conformational mobility in the active site of a heme peroxidase., Badyal SK, Joyce MG, Sharp KH, Seward HE, Mewies M, Basran J, Macdonald IK, Moody PC, Raven EL, J Biol Chem. 2006 Aug 25;281(34):24512-20. Epub 2006 Jun 7. PMID:16762924
Page seeded by OCA on Mon Mar 31 03:16:39 2008
