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Probing the conformational impact of detergents on the integral membrane protein LeuT by global HDX-MS.

Abstract：

:Neurotransmitter:sodium symporters (NSS) are integral membrane proteins (IMP), responsible for reuptake of neurotransmitters from the synaptic cleft. Due to challenges in production of mammalian NSS in their active form, the prokaryotic hydrophobic amino acid transporter, LeuT, served here as a steadfast model for elucidation of structure-function relationship. As NSS proteins reside within phospholipid bilayer, they require stabilization by artificial membrane systems upon their extraction. Right choice of artificial membrane system is crucial as suboptimal detergent and/or lipids can lead to destabilization or non-native stabilization. Here we study the effect of related detergents, dodecyl maltoside (DDM) and lauryl maltose neopentyl glycol (LMNG), on the conformational dynamics of LeuT by global HDX-MS, in the presence of functionally relevant ligands. We observed that LeuT is more dynamic when solubilized in DDM compared to LMNG. Moreover, LeuT exhibited increased HDX in the presence of K+ compared to Na+, indicating a more dynamic conformation in the presence of K+. Upon addition of leucine, LeuT underwent additional stabilization relative to the Na+-bound state. Finally, peak broadening was observed, suggesting that LeuT undergoes slow unfolding/refolding dynamics in detergent solution. These slow dynamics were verified by local HDX, also proving that detergents modulate the rate of these dynamics. SIGNIFICANCE: Overall, we show the efficacy of global HDX-MS to evaluate the effect of artificial membrane systems on integral membrane proteins and the importance of carefully selecting compatible detergent (and/or lipid) for the solubilization of this class of proteins.

journal_name

J Proteomics

journal_title

Journal of proteomics

authors

Möller IR,Merkle PS,Calugareanu D,Comamala G,Schmidt SG,Loland CJ,Rand KD

doi

10.1016/j.jprot.2020.103845

subject

Has Abstract

pub_date

2020-08-15 00:00:00

pages

103845

eissn

1874-3919

issn

1876-7737

pii

S1874-3919(20)30213-X

journal_volume

225

pub_type

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