Comparison of the adsorbed conformation of barley lipid transfer protein at the decane-water and vacuum-water interface: a molecular dynamics simulation

Biomacromolecules
Stephen R EustonR E Westacott

Abstract

Molecular dynamics simulation is used to model the adsorption of the barley lipid transfer protein (LTP) at the decane-water and vacuum-water interfaces. Adsorption at both surfaces is driven by displacement of water molecules from the interfacial region. LTP adsorbed at the decane surface exhibits significant changes in its tertiary structure, and penetrates a considerable distance into the decane phase. At the vacuum-water interface LTP shows small conformational changes away from its native structure and does not penetrate into the vacuum space. Modification of the conformational stability of LTP by reduction of its four disulphide bonds leads to an increase in conformational entropy of the molecules, which reduces the driving force for adsorption. Evidence for changes in the secondary structure are also observed for native LTP at the decane-water interface and reduced LTP at the vacuum-water interface. In particular, intermittent formation of short (six-residue) regions of beta-sheet is found in these two systems. Formation of interfacial beta-sheet in adsorbed proteins has been observed experimentally, notably in the globular milk protein beta-lactoglobulin and lysozyme.

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Citations

Oct 14, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Marek CieplakDaniel H Reich
May 18, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·David L Cheung
Jan 30, 2016·Quarterly Reviews of Biophysics·Musa OzboyaciRebecca C Wade
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Jan 23, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Rajat Dandekar, Arezoo M Ardekani
Apr 1, 2010·The Journal of Physical Chemistry. B·Taotao ZhaoHui Yan

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