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Structure-function relationships in the growing hexa-coordinate hemoglobin sub-family.
Daniele de Sanctis1, Alessandra Pesce, Marco Nardini
1Department of Physics-INFM, Center for Excellence in Biomedical Research, University of Genova, Via Dodecaneso 33, I-16146 Genova, Italy.
IUBMB Life
|April 22, 2005
Summary
Globins bind ligands to heme iron. Novel hexa-coordinate globins feature an internal protein ligand, modulating external ligand binding through reversible iron coordination changes.
Area of Science:
- Biochemistry
- Structural Biology
- Protein Science
Background:
- Globins, including hemoglobin, typically bind diatomic ligands to a penta-coordinate heme iron.
- Recent discoveries reveal globins with a hexa-coordinate heme iron, where an endogenous protein occupies the sixth site.
Purpose of the Study:
- To review current knowledge on hexa-coordinate globins.
- To discuss their structural and functional characteristics.
Main Methods:
- Literature review of hexa-coordinate globins.
- Analysis of structural and functional data.
Main Results:
- Hexa-coordinate globins possess a unique heme iron coordination.
- A reversible intramolecular process shifts the heme iron between penta- and hexa-coordination states.
- This coordination change influences the binding affinity for exogenous ligands.
Conclusions:
- Hexa-coordinate globins represent a distinct class of heme proteins.
- The dynamic coordination of the heme iron is key to their function.
- Further research into these globins can reveal novel biological roles and applications.