2bh5: Difference between revisions
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[[Image:2bh5.gif|left|200px]] | [[Image:2bh5.gif|left|200px]] | ||
'''X-RAY STRUCTURE OF THE M100K VARIANT OF FERRIC CYT C-550 FROM PARACOCCUS VERSUTUS DETERMINED AT 295 K.''' | {{Structure | ||
|PDB= 2bh5 |SIZE=350|CAPTION= <scene name='initialview01'>2bh5</scene>, resolution 1.95Å | |||
|SITE= <scene name='pdbsite=AC1:Hec+Binding+Site+For+Chain+X'>AC1</scene> | |||
|LIGAND= <scene name='pdbligand=HEC:HEME C'>HEC</scene> | |||
|ACTIVITY= | |||
|GENE= | |||
}} | |||
'''X-RAY STRUCTURE OF THE M100K VARIANT OF FERRIC CYT C-550 FROM PARACOCCUS VERSUTUS DETERMINED AT 295 K.''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
2BH5 is a [ | 2BH5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Paracoccus_versutus Paracoccus versutus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2BH5 OCA]. | ||
==Reference== | ==Reference== | ||
The effect of replacing the axial methionine ligand with a lysine residue in cytochrome c-550 from Paracoccus versutus assessed by X-ray crystallography and unfolding., Worrall JA, van Roon AM, Ubbink M, Canters GW, FEBS J. 2005 May;272(10):2441-55. PMID:[http:// | The effect of replacing the axial methionine ligand with a lysine residue in cytochrome c-550 from Paracoccus versutus assessed by X-ray crystallography and unfolding., Worrall JA, van Roon AM, Ubbink M, Canters GW, FEBS J. 2005 May;272(10):2441-55. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15885094 15885094] | ||
[[Category: Paracoccus versutus]] | [[Category: Paracoccus versutus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: pyrrolidone carboxylic acid]] | [[Category: pyrrolidone carboxylic acid]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 16:01:53 2008'' | ||
Revision as of 17:01, 20 March 2008
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| Coordinates: | save as pdb, mmCIF, xml | ||||||
X-RAY STRUCTURE OF THE M100K VARIANT OF FERRIC CYT C-550 FROM PARACOCCUS VERSUTUS DETERMINED AT 295 K.
OverviewOverview
The structure of cytochrome c-550 from the nonphotosynthetic bacteria Paraccocus versutus has been solved by X-ray crystallography to 1.90 A resolution, and reveals a high structural homology to other bacterial cytochromes c(2). The effect of replacing the axial heme-iron methionine ligand with a lysine residue on protein structure and unfolding has been assessed using the M100K variant. From X-ray structures at 1.95 and 1.55 A resolution it became clear that the amino group of the lysine side chain coordinates to the heme-iron. Structural differences compared to the wild-type protein are confined to the lysine ligand loop connecting helices four and five. In the heme cavity an additional water molecule is found which participates in an H-bonding interaction with the lysine ligand. Under cryo-conditions extra electron density in the lysine ligand loop is revealed, leading to residues K97 to T101 being modeled with a double main-chain conformation. Upon unfolding, dissociation of the lysine ligand from the heme-iron is shown to be pH dependent, with NMR data consistent with the occurrence of a ligand exchange mechanism similar to that seen for the wild-type protein.
About this StructureAbout this Structure
2BH5 is a Single protein structure of sequence from Paracoccus versutus. Full crystallographic information is available from OCA.
ReferenceReference
The effect of replacing the axial methionine ligand with a lysine residue in cytochrome c-550 from Paracoccus versutus assessed by X-ray crystallography and unfolding., Worrall JA, van Roon AM, Ubbink M, Canters GW, FEBS J. 2005 May;272(10):2441-55. PMID:15885094
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