1i54

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[[Image:1i54.gif|left|200px]]
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{{STRUCTURE_1i54| PDB=1i54 | SCENE= }}
{{STRUCTURE_1i54| PDB=1i54 | SCENE= }}
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'''CYTOCHROME C (TUNA) 2FE:1ZN MIXED-METAL PORPHYRINS'''
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===CYTOCHROME C (TUNA) 2FE:1ZN MIXED-METAL PORPHYRINS===
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==Overview==
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The current understanding of electron tunneling through proteins has come from work on systems where donors and acceptors are held at fixed distances and orientations. The factors that control electron flow between proteins are less well understood, owing to uncertainties in the relative orientations and structures of the reactants during the very short time that tunneling occurs. As we report here, the way around such structural ambiguity is to examine oxidation-reduction reactions in protein crystals. Accordingly, we have measured and analyzed the kinetics of electron transfer between native and Zn-substituted tuna cytochrome c (cyt c) molecules in crystals of known structure. Electron transfer rates [(320 s(-1) for *Zn-cyt c --&gt; Fe(III)-cyt c; 2000 s(-1) for Fe(II)-cyt c --&gt; Zn-cyt c(+))] over a Zn-Fe distance of 24.1 A closely match those for intraprotein electron tunneling over similar donor-acceptor separations. Our results indicate that van der Waals interactions and water-mediated hydrogen bonds are effective coupling elements for tunneling across a protein-protein interface.
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The line below this paragraph, {{ABSTRACT_PUBMED_11296248}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 11296248 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11296248}}
==About this Structure==
==About this Structure==
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[[Category: Mixed-metal]]
[[Category: Mixed-metal]]
[[Category: Zinc-porphyrin]]
[[Category: Zinc-porphyrin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:35:10 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:26:01 2008''

Revision as of 07:26, 1 July 2008

Image:1i54.png

Template:STRUCTURE 1i54

CYTOCHROME C (TUNA) 2FE:1ZN MIXED-METAL PORPHYRINS

Template:ABSTRACT PUBMED 11296248

About this Structure

1I54 is a Single protein structure of sequence from Thunnus thynnus. Full crystallographic information is available from OCA.

Reference

Electron tunneling in protein crystals., Tezcan FA, Crane BR, Winkler JR, Gray HB, Proc Natl Acad Sci U S A. 2001 Apr 24;98(9):5002-6. Epub 2001 Apr 10. PMID:11296248

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