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A refined model for the solution structure of oxidized putidaredoxin.

T C Pochapsky1, N U Jain, M Kuti

  • 1Departments of Chemistry and Biology, Brandeis University, Waltham, Massachusetts 02254-9110, USA. pochapsky@binah.cc.brandeis.edu

Biochemistry
|April 14, 1999
PubMed
Summary

This study refines the solution structure of oxidized putidaredoxin (Pdxo), a Cys4Fe2S2 ferredoxin, using advanced NMR techniques and modeling. The improved structural model offers greater precision for understanding ferredoxin dynamics and function.

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Putidaredoxin (Pdxo) is a Cys4Fe2S2 ferredoxin whose solution structure was previously determined using NMR.
  • Paramagnetic properties of native ferredoxins limit detailed structural analysis, necessitating complementary approaches.
  • Previous structural models relied on limited NMR data, prompting a need for refinement.

Purpose of the Study:

  • To refine the solution structure of oxidized putidaredoxin (Pdxo) using newly acquired NMR data and advanced computational methods.
  • To incorporate data from diamagnetic variants and related ferredoxin crystal structures for a more comprehensive model.
  • To enhance the precision of structural restraints, particularly for backbone dihedral angles and NOE interactions.

Main Methods:

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  • Acquisition of new multidimensional NMR data (15N, 13C) for complete resonance assignments in Pdxo.
  • Utilized 15N- and 13C-resolved NOESY experiments to identify new Nuclear Overhauser Effect (NOE) restraints.
  • Employed biosynthetically directed fractional 13C labeling for stereospecific assignments of leucine and valine methyl resonances.
  • Determined backbone dihedral angle restraints using 2D J-modulated 15N,1H HSQC and 3D (HN)CO(CO)NH experiments.
  • Integrated structural information from a diamagnetic Cys85Ser variant of gallium putidaredoxin and the crystal structure of bovine adrenodoxin.

Main Results:

  • A refined family of fourteen Pdxo solution structures was calculated, showing backbone heavy atom RMSD of 0.51 Å and all-atom RMSD of 0.83 Å.
  • Excluding the modeled metal-binding loop region reduced the backbone RMSD to 0.30 Å and all-atom RMSD to 0.71 Å, indicating high precision in the core structure.
  • New NMR restraints and stereospecific assignments significantly improved the accuracy and detail of the Pdxo structural model.

Conclusions:

  • The refined solution structure of oxidized putidaredoxin (Pdxo) provides a more accurate representation of this Cys4Fe2S2 ferredoxin.
  • The study highlights the power of combining multiple NMR techniques and complementary structural data for detailed protein structure determination.
  • This enhanced structural model facilitates a deeper understanding of ferredoxin function and electron transfer mechanisms.