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Spatial relationship between cytochrome a and a3.

T Ohnishi, R LoBrutto, J C Salerno

    The Journal of Biological Chemistry
    |December 25, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers measured the distance between cytochromes a and a3 using electron paramagnetic resonance (EPR) spectroscopy. They determined an iron-iron distance of 12-16 angstroms within the cytochrome complex.

    Area of Science:

    • Biophysics
    • Biochemistry
    • Structural Biology

    Background:

    • Cytochromes a and a3 are crucial components of the electron transport chain.
    • Understanding their spatial arrangement is key to elucidating enzyme mechanisms.

    Purpose of the Study:

    • To determine the spatial relationship between cytochromes a and a3.
    • To estimate the iron-iron distance and orientation within the mitochondrial membrane.

    Main Methods:

    • Electron Paramagnetic Resonance (EPR) spectroscopy of cytochrome a3-NO complex at 15 K.
    • Utilizing spin relaxation enhancement and absence of dipolar broadening.
    • Integrating resonance X-ray diffraction data.

    Main Results:

    Related Experiment Videos

  • Estimated an initial Fe-Fe distance of 12-19 Å based on EPR data.
  • Refined the Fe-Fe distance to 12-16 Å when combined with X-ray diffraction.
  • Calculated the angle between the Fe-Fe vector and mitochondrial membrane normal to be 30-60 degrees.
  • Considered the influence of CuA on cytochrome a3-NO.

    • Conclusions:

    • Established a precise Fe-Fe distance and orientation for cytochromes a and a3.
    • Provides structural insights into the electron transport chain.
    • Highlights the interplay of spectroscopic and diffraction techniques for structural determination.