1LM2

NMR structural characterization of the reduction of chromium(VI) to chromium(III) by cytochrome c7


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 35 
  • Selection Criteria: structures with best target function 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The metal reductase activity of some multiheme cytochromes c: NMR structural characterization of the reduction of chromium(VI) to chromium(III) by cytochrome c(7).

Assfalg, M.Bertini, I.Bruschi, M.Michel, C.Turano, P.

(2002) Proc.Natl.Acad.Sci.USA 99: 9750-9754

  • DOI: 10.1073/pnas.152290999

  • PubMed Abstract: 
  • The redox reaction between CrO(4)(2-) and the fully reduced three-heme cytochrome c(7) from Desulfuromonas acetoxidans to give chromium(III) and the fully oxidized protein has been followed by NMR spectroscopy. The hyperfine coupling between the oxid ...

    The redox reaction between CrO(4)(2-) and the fully reduced three-heme cytochrome c(7) from Desulfuromonas acetoxidans to give chromium(III) and the fully oxidized protein has been followed by NMR spectroscopy. The hyperfine coupling between the oxidized protein protons and chromium(III), which remains bound to the protein, gives rise to line-broadening effects on the NMR resonances that can be transformed into proton-metal distance restraints. Structure calculations based on these unconventional constraints allowed us to demonstrate that chromium(III) binds at a unique site and to locate it on the protein surface. The metal ion is located 7.9 +/- 0.4 A from the iron of heme IV, 16.3 +/- 0.7 A from the iron of heme III, and 22.5 +/- 0.5 A from the iron of heme I. Shift changes caused by the presence of unreactive MoO(4)(2-), a CrO(4)(2-) analogue, indicate the involvement of the same protein area in the anion binding. The titration of the oxidation of cytochrome c(7) shows a detailed mechanism of action. The presence of a specific binding site supports the hypothesis of the biological role of this cytochrome as a metal reductase.


    Organizational Affiliation

    Magnetic Resonance Center and Department of Chemistry, University of Florence, Via Luigi Sacconi, 6, 50019 Sesto Fiorentino (Florence), Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cytochrome c7
A
68Desulfuromonas acetoxidansGene Names: cyd
Find proteins for P00137 (Desulfuromonas acetoxidans)
Go to UniProtKB:  P00137
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CR
Query on CR

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A
CHROMIUM ION
Cr
BFGKITSFLPAWGI-UHFFFAOYSA-N
 Ligand Interaction
HEC
Query on HEC

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Download CCD File 
A
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 35 
  • Selection Criteria: structures with best target function 
  • Olderado: 1LM2 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-31
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance