Retinol-binding protein transports retinol, and circulates in the plasma as a macromolecular complex with the protein transthyretin. Under acidic conditions retinol-binding protein undergoes a transition to the molten globule state, and releases the bound retinol ligand. A biased molecular dynamics simulation method has been used to generate models for the ensemble of conformers populated within this molten globule state. Simulation conformers, with a radius of gyration at least 1.1 Å greater than that of the native state, contain on average 37% β-sheet secondary structure. In these conformers the central regions of the two orthogonal β-sheets that make up the β-barrel in the native protein are highly persistent. However, there are sizable fluctuations for residues in the outer regions of the β-sheets, and large variations in side chain packing even in the protein core. Significant conformational changes are seen in the simulation conformers for residues 85-104 (β-strands E and F and the E-F loop). These changes give an opening of the retinol-binding site. Comparisons with experimental data suggest that the unfolding in this region may provide a mechanism by which the complex of retinol-binding protein and transthyretin dissociates, and retinol is released at the cell surface. © 2005 FEBS.

Paci E., Greene L.H., Jones R.M., Smith L.J. (2005). Characterization of the molten globule state of retinol-binding protein using a molecular dynamics simulation approach. THE FEBS JOURNAL, 272(18), 4826-4838 [10.1111/j.1742-4658.2005.04898.x].

Characterization of the molten globule state of retinol-binding protein using a molecular dynamics simulation approach

Paci E.
;
2005

Abstract

Retinol-binding protein transports retinol, and circulates in the plasma as a macromolecular complex with the protein transthyretin. Under acidic conditions retinol-binding protein undergoes a transition to the molten globule state, and releases the bound retinol ligand. A biased molecular dynamics simulation method has been used to generate models for the ensemble of conformers populated within this molten globule state. Simulation conformers, with a radius of gyration at least 1.1 Å greater than that of the native state, contain on average 37% β-sheet secondary structure. In these conformers the central regions of the two orthogonal β-sheets that make up the β-barrel in the native protein are highly persistent. However, there are sizable fluctuations for residues in the outer regions of the β-sheets, and large variations in side chain packing even in the protein core. Significant conformational changes are seen in the simulation conformers for residues 85-104 (β-strands E and F and the E-F loop). These changes give an opening of the retinol-binding site. Comparisons with experimental data suggest that the unfolding in this region may provide a mechanism by which the complex of retinol-binding protein and transthyretin dissociates, and retinol is released at the cell surface. © 2005 FEBS.
2005
Paci E., Greene L.H., Jones R.M., Smith L.J. (2005). Characterization of the molten globule state of retinol-binding protein using a molecular dynamics simulation approach. THE FEBS JOURNAL, 272(18), 4826-4838 [10.1111/j.1742-4658.2005.04898.x].
Paci E.; Greene L.H.; Jones R.M.; Smith L.J.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/886273
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