Abstract
Neuroglobin, a member of vertebrate globin family, is distributed primarily in the brain and retina. Considerable evidence has accumulated regarding its unique ligand-binding properties, neural-specific distribution, distinct expression regulation, and possible roles in processes such as neuron protection and enzymatic metabolism. Structurally, neuroglobin enjoys unique features, such as bis-histidyl coordination to heme iron in the absence of exogenous ligand, heme orientational heterogeneity, and a heme sliding mechanism accompanying ligand binding. In the present work, molecular dynamics (MD) simulations were employed to reveal functional and structural information in three carboxyl murine neuroglobin mutants with single point mutations F106Y, F106L and F106I, respectively. The MD simulation indicates a remarkable proximal effect on detectable displacement of heme and a larger tunnel in the protein matrix. In addition, the mutation at F106 confers on the CD region a very sensitive mobility in all three model structures. The dynamic features of neuroglobin demonstrate rearrangement of the inner space and highly active loop regions in solution. These imply that the conserved residue at the G5 site plays a key role in the physiological function of this unusual protein.
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Abbreviations
- Ngb:
-
Neuroglobin
- Hb:
-
Hemoglobin
- Mb:
-
Myoglobin
- MD:
-
Molecular dynamics
- CO:
-
Carbon monoxide
- F106LNgb:
-
F106L neuroglobin mutant
- NgbCO:
-
Carboxy neuroglobin
- F106YNgbCO:
-
Carboxy neuroglobin of F106Y mutant
- F106LNgbCO:
-
Carboxy neuroglobin of F106L mutant
- F106INgbCO:
-
Carboxy neuroglobin of F106I mutant
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Acknowledgments
We thank Prof. Roman Laskowski at European Bioinformatics Institute (Cambridge, UK) for providing the Surfnet software and for helpful discussion. This work was supported by grants from the National Natural Science Foundation of China No. 20473013 and No. 20633080, as well as the National Basic Research Program of China (No. 2004CB719900).
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Fig. S1
Root-mean-square deviation (RMSD) of the control NgbCO (a), NgbF106YCO (b), NgbF106LCO (c), and NgbF106ICO (d). (DOC 140 kb)
Fig. S2
The orientation angle between His96(F8) ring plane and heme in NgbCO (a), F106YNgbCO (b), F106LNgbCO(c), and F106INgbCO (d). (DOC 138 kb)
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Xu, J., Yin, G., Huang, F. et al. Molecular dynamics simulation of a carboxy murine neuroglobin mutated on the proximal side: heme displacement and concomitant rearrangement in loop regions. J Mol Model 16, 759–770 (2010). https://doi.org/10.1007/s00894-009-0581-3
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DOI: https://doi.org/10.1007/s00894-009-0581-3