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A structure-based model for cytochrome P450cam-putidaredoxin interactions

T C Pochapsky1, T A Lyons, S Kazanis

  • 1Department of Chemistry, Brandeis University, Waltham, MA 02254-9110, USA.

Biochimie
|January 1, 1996
PubMed
Summary
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Putidaredoxin (Pdx) and cytochrome P-450cam (CYP101) form a complex for electron transfer. NMR studies reveal specific interactions and suggest conformational gating regulates this crucial biological process.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Putidaredoxin (Pdx) is an Fe2S2 ferredoxin essential for cytochrome P-450cam (CYP101) function.
  • Previous studies established Pdx solution structure and redox-dependent properties.

Purpose of the Study:

  • To elucidate the structural basis of the Pdx-CYP101 interaction.
  • To investigate the mechanism of electron transfer between Pdx and CYP101.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy (1H-15N correlations, 2D NMR).
  • Mutagenesis and kinetic measurements.
  • Molecular modeling and dynamics simulations.

Main Results:

  • A structural model of the Pdx-CYP101 complex was proposed, featuring close metal center approach and aromatic residue interactions.

Related Experiment Videos

  • The complex model includes salt bridges, hydrogen bonds, and a 12 Å distance between metal centers.
  • Direct NMR observations confirmed interactions, suggesting conformational gating influences electron transfer.

    • Conclusions:

    • Conformational gating is likely a key regulatory mechanism in the Pdx-CYP101 electron transfer complex.
    • Structural insights into ferredoxin-cytochrome P450 interactions are provided.