View source for 2ghc

[[Image:2ghc.gif|left|200px]]<br /><applet load="2ghc" size="350" color="white" frame="true" align="right" spinBox="true" 
caption="2ghc, resolution 1.25&Aring;" />
'''Conformational mobility in the active site of a heme peroxidase'''<br />

==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 [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Glycine_max Glycine max] with <scene name='pdbligand=NA:'>NA</scene>, <scene name='pdbligand=HEM:'>HEM</scene> and <scene name='pdbligand=NO:'>NO</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GHC 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:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16762924 16762924]
[[Category: Glycine max]]
[[Category: L-ascorbate peroxidase]]
[[Category: Single protein]]
[[Category: Badyal, S K.]]
[[Category: Joyce, M G.]]
[[Category: Moody, P C.]]
[[Category: Raven, E L.]]
[[Category: Sharp, K H.]]
[[Category: HEM]]
[[Category: NA]]
[[Category: NO]]
[[Category: orthogonal bundle]]

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