A refined model for the solution structure of oxidized putidaredoxin.Pochapsky, T.C., Jain, N.U., Kuti, M., Lyons, T.A., Heymont, J.
(1999) Biochemistry 38: 4681-4690
- PubMed: 10200155
- DOI: 10.1021/bi983030b
- Also Cited By: 1YJI, 1YJJ
- PubMed Abstract:
- Characterization of Hyperfine-Shifted ==1==H Resonances in Oxidized and Reduced Putidaredoxin, an Fe=2=S=2=Ferredoxin from Pseudomonus Putida
Ratnaswamy, G.,Pochapsky, T.C.
(1994) Magn.Reson.Chem. 31: 73
- New Aspects of Electron Transfer Revealed by the Crystal Structure of a Truncated Bovine Adrenodoxin, Adx(4-108)
Muller, A.,Muller, J.J.,Muller, Y.A.,Uhlmann, H.,Bernhardt, R.,Heinemann, U.
(1998) Structure 6: 269
- An NMR-Derived Model for the Solution Structure of Oxidized Putidaredoxin, a 2Fe, 2-S Ferredoxin from Pseudomonas
Pochapsky, T.C.,Ye, X.M.,Ratnaswamy, G.,Lyons, T.A.
(1994) Biochemistry 33: 6424
- 1H NMR Sequential Assignments and Identification of Secondary Structural Elements in Oxidized Putidaredoxin, an Electron-Transfer Protein from Pseudomonas
Ye, X.M.,Pochapsky, T.C.,Pochapsky, S.S.
(1992) Biochemistry 31: 1961
- Redox-Dependent ==1==H NMR Spectral Features and Tertiary Structural Constraints on the C-Terminal Region of Putidaredoxin
Pochapsky, T.C.,Ratnaswamy, G.,Patera, A.
(1994) Biochemistry 33: 6433
- 1H NMR Identification of a Beta-Sheet Structure and Description of Folding Topology in Putidaredoxin
Pochapsky, T.C.,Ye, X.M.
(1991) Biochemistry 30: 3850
A refined model for the solution structure of oxidized putidaredoxin (Pdxo), a Cys4Fe2S2 ferredoxin, has been determined. A previous structure (Pochapsky et al. (1994) Biochemistry 33, 6424-6432; PDB entry ) was calculated using the results of homonu ...
A refined model for the solution structure of oxidized putidaredoxin (Pdxo), a Cys4Fe2S2 ferredoxin, has been determined. A previous structure (Pochapsky et al. (1994) Biochemistry 33, 6424-6432; PDB entry ) was calculated using the results of homonuclear two-dimensional NMR experiments. New data has made it possible to calculate a refinement of the original Pdxo solution structure. First, essentially complete assignments for diamagnetic 15N and 13C resonances of Pdxo have been made using multidimensional NMR methods, and 15N- and 13C-resolved NOESY experiments have permitted the identification of many new NOE restraints for structural calculations. Stereospecific assignments for leucine and valine CH3 resonances were made using biosynthetically directed fractional 13C labeling, improving the precision of NOE restraints involving these residues. Backbone dihedral angle restraints have been obtained using a combination of two-dimensional J-modulated 15N,1H HSQC and 3D (HN)CO(CO)NH experiments. Second, the solution structure of a diamagnetic form of Pdx, that of the C85S variant of gallium putidaredoxin, in which a nonligand Cys is replaced by Ser, has been determined (Pochapsky et al. (1998) J. Biomol. NMR 12, 407-415), providing information concerning structural features not observable in the native ferredoxin due to paramagnetism. Third, a crystal structure of a closely related ferredoxin, bovine adrenodoxin, has been published (Müller et al. (1998) Structure 6, 269-280). This structure has been used to model the metal binding site structure in Pdx. A family of fourteen structures is presented that exhibits an rmsd of 0.51 A for backbone heavy atoms and 0.83 A for all heavy atoms. Exclusion of the modeled metal binding loop region reduces overall the rmsd to 0.30 A for backbone atoms and 0.71 A for all heavy atoms.
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