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Structure-energy relations in methylcobalamin with and without bound axial base
Carme Rovira1, Xevi Biarnés, Karel Kunc
1Centre de Recerca en Química Teorica, Parc Científic de Barcelona, Josep Samitier 1-5, 08028 Barcelona, Spain. crovira@pcb.ub.es
Inorganic Chemistry
|October 13, 2004
Summary
First-principles molecular dynamics reveal methylcobalamin (MeCbl) bond properties. The axial base slightly weakens the cobalt-carbon bond, while the alkyl ligand strengthens the cobalt-axial base bond, explaining MeCbl
Area of Science:
- Biochemistry and Molecular Dynamics
Background:
- Methylcobalamin (MeCbl) is a crucial form of vitamin B12.
- Understanding the Co-C bond dynamics is key to its biological function.
Purpose of the Study:
- To analyze the properties of the cobalt-carbon (Co-C) bond in methylcobalamin.
- To investigate the influence of axial ligands on MeCbl structure and stability.
Main Methods:
- First-principles molecular dynamics simulations.
- Analysis of binding energies, bond orders, and vibrational frequencies.
Main Results:
- Simulated structure accurately matches experimental data, including corrin ring deformation.
- The axial base weakens the Co-C bond by 4%.
- The alkyl ligand strengthens the Co-axial base bond by 90%.
Conclusions:
- The findings provide detailed insight into MeCbl's electronic structure and stability.
- These results support experimental observations and explain MeCbl's base-on/base-off form conversion.