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mm:parameters:copper_zinc:hhhh_cu_dhhh_zn
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Copper (II) - HHHH / Zinc (II) - HHHD
The metal center of Superoxide Dismutase is hereby presented, in which the zinc atom is bonded to 3 histidines, and 1 aspartate (monodentate) and the copper atom to 4 histidines. Validation for this metal centre in the protein environment is additionally provided.
| Coordination Sphere | Oxidation state: Cu(II) / Zn(II) Spin multiplicity: 1 / 1 |
 | 1) |
Structure chosen to parameterize
| TEST PROTEIN | |
| Protein | Superoxide Dismutase |
| PDB Code | 1CBJ |
| Crystallographic Resolution | 1.65 Å |
| Organism | Bos taurus |
| [Hough, 1999] | |
Parameters Determined
Atom Types
| ATOM TYPE | NEW ATOM TYPE | MASS | STRUCTURE |
| CU | CU | |
|
| ZN | ZN | ||
| NE2 | NB | 14.0067 | |
| ND1 | NB | 14.0067 | |
| OD1 | OS | 15.9994 |
Bond Parameters
| BOND | Kl / kcal mol-1 Å-2 | l / Å | REFERENCE |
| ZN-NB | 96.7 | 2.046 | [Branco, 2006] |
| ZN-OS | 92.0 | 1.949 | |
| CU-NB | 101.1 | 2.022 |
Angles Parameters
| ANGLE | Kθ / kcal mol-1 rad-2 | θ / deg | REFERENCE |
| NB-CU-NB | 24.6 | 147.19 | [Branco, 2006] |
| NB-ZN-NB | 44.0 | 113.53 | |
| NB-ZN-OS | 21.7 | 111.75 |
Van der Waals Parameters
| ATOM TYPE | Ri / Å | εi / kcal mol-1 | REFERENCE |
| ZN | 1.7000 | 0.0125 | [Ryde, 1995] |
| CU | 1.7000 | 0.0125 | [Ryde, 1995] |
| OS | 1.6612 | 0.2100 | |
| NB | 1.8240 | 0.1700 |
Validation of Parameters from MD Simulations
Bond Parameters
| BOND | l0 crystal | ‹l›MD ± σ(l) | ‹θ›MD ± σ(θ) |
| ZF-OF | 2.00 | 2.06 ± 0.06 | 2.09 ± 0.06 |
| ZF-OG | 2.56 | 2.15 ± 0.07 | 2.13 ± 0.07 |
| ZF-SF | 2.22 | 2.23 ± 0.05 | 2.24 ± 0.05 |
| ZF-NF | 2.48 | 2.02 ± 0.06 | 2.03 ± 0.06 |
Angle Parameters
| ANGLE | θ0 crystal | ‹θ›MD ± σ(θ) | ‹θ›MD ± σ(θ) |
| NF-ZF-SF | 118 | 119 ± 5 | 114 ± 6 |
| OF-ZF-NF | 120 | 101 ± 6 | 102 ± 7 |
| OF-ZF-OG | 56 | 64 ± 1 | 63 ± 1 |
| OF-ZF-SF | 104 | 124 ± 6 | 124 ± 6 |
| OG-ZF-NF | 90 | 81 ± 4 | 80 ± 5 |
| SF-ZF-OG | 80 | 84 ± 6 | 83 ± 6 |
Downloads
References
Branco, J.F.B.; Fernandes, P.A.; Ramos, M.J.. Molecular Dynamics Simulations of the Enzyme Cu, Zn Superoxide Dismutase . J. Phys. Chem. B, 2006, 110, 16754-16762
1)
The schemes represent geometrical dispositions for crystal lattices. These should be roughly similar to the corresponding distorted geometries in enzymatic coordination spheres.
mm/parameters/copper_zinc/hhhh_cu_dhhh_zn.1375280688.txt.gz · Last modified: 2013/07/31 15:24 by joaocoimbra
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