2je2: Difference between revisions
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==Overview== | ==Overview== | ||
We have determined the 1.8 A X-ray crystal structure of a monoheme c-type | We have determined the 1.8 A X-ray crystal structure of a monoheme c-type cytochrome, cytochrome P460, from Nitrosomonas europea. The chromophore possesses unusual spectral properties analogous to those of the catalytic heme P460 of hydroxylamine oxidoreductase (HAO), the only known heme in biology to withdraw electrons from an iron-coordinated substrate. The analysis reveals a homodimeric structure and elucidates a new c-type cytochrome fold that is predominantly beta-sheet. In addition to the two cysteine thioether links to the porphyrin typical of c-type hemes, there is a third proteinaceous link involving a conserved lysine. The covalent bond is between the lysine side-chain nitrogen and the 13'-meso carbon of the heme, which, following cross-link formation, is sp3-hybridized, demonstrating the loss of conjugation at this position within the porphyrin. The structure has implications for the analogous tyrosine-heme meso carbon cross-link observed in HAO. | ||
==About this Structure== | ==About this Structure== | ||
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==Reference== | ==Reference== | ||
The | The crystal structure of cytochrome P460 of Nitrosomonas europaea reveals a novel cytochrome fold and heme-protein cross-link., Pearson AR, Elmore BO, Yang C, Ferrara JD, Hooper AB, Wilmot CM, Biochemistry. 2007 Jul 17;46(28):8340-9. Epub 2007 Jun 21. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17583915 17583915] | ||
[[Category: Nitrosomonas europaea]] | [[Category: Nitrosomonas europaea]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Elmore, B | [[Category: Elmore, B O.]] | ||
[[Category: Ferrara, J | [[Category: Ferrara, J D.]] | ||
[[Category: Hooper, A | [[Category: Hooper, A B.]] | ||
[[Category: Pearson, A | [[Category: Pearson, A R.]] | ||
[[Category: Wilmot, C | [[Category: Wilmot, C M.]] | ||
[[Category: Yang, C.]] | [[Category: Yang, C.]] | ||
[[Category: HEC]] | [[Category: HEC]] | ||
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[[Category: metal binding protein]] | [[Category: metal binding protein]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 18:02:15 2008'' | ||
Revision as of 19:02, 21 February 2008
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CYTOCHROME P460 FROM NITROSOMONAS EUROPAEA- PROBABLE NONPHYSIOLOGICAL OXIDIZED FORM
OverviewOverview
We have determined the 1.8 A X-ray crystal structure of a monoheme c-type cytochrome, cytochrome P460, from Nitrosomonas europea. The chromophore possesses unusual spectral properties analogous to those of the catalytic heme P460 of hydroxylamine oxidoreductase (HAO), the only known heme in biology to withdraw electrons from an iron-coordinated substrate. The analysis reveals a homodimeric structure and elucidates a new c-type cytochrome fold that is predominantly beta-sheet. In addition to the two cysteine thioether links to the porphyrin typical of c-type hemes, there is a third proteinaceous link involving a conserved lysine. The covalent bond is between the lysine side-chain nitrogen and the 13'-meso carbon of the heme, which, following cross-link formation, is sp3-hybridized, demonstrating the loss of conjugation at this position within the porphyrin. The structure has implications for the analogous tyrosine-heme meso carbon cross-link observed in HAO.
About this StructureAbout this Structure
2JE2 is a Single protein structure of sequence from Nitrosomonas europaea with and as ligands. Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
The crystal structure of cytochrome P460 of Nitrosomonas europaea reveals a novel cytochrome fold and heme-protein cross-link., Pearson AR, Elmore BO, Yang C, Ferrara JD, Hooper AB, Wilmot CM, Biochemistry. 2007 Jul 17;46(28):8340-9. Epub 2007 Jun 21. PMID:17583915
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