Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes

Like many soft materials, lipids undergo a melting transition associated with a significant increase in their dynamics. At temperatures below the main melting transition (Tm), all molecular and collective dynamics are suppressed, while above Tm the alkyl tail motions, lipid diffusivity, and collecti...
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Autor*in:	Elizabeth G. Kelley [verfasserIn] Michihiro Nagao [verfasserIn] Paul D. Butler [verfasserIn] Lionel Porcar [verfasserIn] Bela Farago [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2020

Übergeordnetes Werk:	In: Structural Dynamics - AIP Publishing LLC and ACA, 2016, 7(2020), 5, Seite 054704-054704-10
Übergeordnetes Werk:	volume:7 ; year:2020 ; number:5 ; pages:054704-054704-10

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1063/4.0000031

Katalog-ID:	DOAJ029474434

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520			\|a Like many soft materials, lipids undergo a melting transition associated with a significant increase in their dynamics. At temperatures below the main melting transition (Tm), all molecular and collective dynamics are suppressed, while above Tm the alkyl tail motions, lipid diffusivity, and collective membrane undulations are at least an order of magnitude faster. Here we study the collective dynamics of dimyristoylphosphatidylglycerol (DMPG, di 14:0 PG) using neutron spin echo spectroscopy throughout its anomalous phase transition that occurs over a 12 °C–20° C wide temperature window. Our results reveal that the membranes are softer and more dynamic during the phase transition than at higher temperatures corresponding to the fluid phase and provide direct experimental evidence for the predicted increase in membrane fluctuations during lipid melting. These results provide new insights into the nanoscale lipid membrane dynamics during the melting transition and demonstrate how these dynamics are coupled to changes in the membrane structure.
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language	English
source	In Structural Dynamics 7(2020), 5, Seite 054704-054704-10 volume:7 year:2020 number:5 pages:054704-054704-10
sourceStr	In Structural Dynamics 7(2020), 5, Seite 054704-054704-10 volume:7 year:2020 number:5 pages:054704-054704-10
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container_title	Structural Dynamics
authorswithroles_txt_mv	Elizabeth G. Kelley @@aut@@ Michihiro Nagao @@aut@@ Paul D. Butler @@aut@@ Lionel Porcar @@aut@@ Bela Farago @@aut@@
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callnumber-first	Q - Science
author	Elizabeth G. Kelley
spellingShingle	Elizabeth G. Kelley misc QD901-999 misc Crystallography Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes
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topic_title	QD901-999 Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes
topic	misc QD901-999 misc Crystallography
topic_unstemmed	misc QD901-999 misc Crystallography
topic_browse	misc QD901-999 misc Crystallography
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title	Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes
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title_full	Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes
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author-letter	Elizabeth G. Kelley
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title_sort	enhanced dynamics in the anomalous melting regime of dmpg lipid membranes
callnumber	QD901-999
title_auth	Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes
abstract	Like many soft materials, lipids undergo a melting transition associated with a significant increase in their dynamics. At temperatures below the main melting transition (Tm), all molecular and collective dynamics are suppressed, while above Tm the alkyl tail motions, lipid diffusivity, and collective membrane undulations are at least an order of magnitude faster. Here we study the collective dynamics of dimyristoylphosphatidylglycerol (DMPG, di 14:0 PG) using neutron spin echo spectroscopy throughout its anomalous phase transition that occurs over a 12 °C–20° C wide temperature window. Our results reveal that the membranes are softer and more dynamic during the phase transition than at higher temperatures corresponding to the fluid phase and provide direct experimental evidence for the predicted increase in membrane fluctuations during lipid melting. These results provide new insights into the nanoscale lipid membrane dynamics during the melting transition and demonstrate how these dynamics are coupled to changes in the membrane structure.
abstractGer	Like many soft materials, lipids undergo a melting transition associated with a significant increase in their dynamics. At temperatures below the main melting transition (Tm), all molecular and collective dynamics are suppressed, while above Tm the alkyl tail motions, lipid diffusivity, and collective membrane undulations are at least an order of magnitude faster. Here we study the collective dynamics of dimyristoylphosphatidylglycerol (DMPG, di 14:0 PG) using neutron spin echo spectroscopy throughout its anomalous phase transition that occurs over a 12 °C–20° C wide temperature window. Our results reveal that the membranes are softer and more dynamic during the phase transition than at higher temperatures corresponding to the fluid phase and provide direct experimental evidence for the predicted increase in membrane fluctuations during lipid melting. These results provide new insights into the nanoscale lipid membrane dynamics during the melting transition and demonstrate how these dynamics are coupled to changes in the membrane structure.
abstract_unstemmed	Like many soft materials, lipids undergo a melting transition associated with a significant increase in their dynamics. At temperatures below the main melting transition (Tm), all molecular and collective dynamics are suppressed, while above Tm the alkyl tail motions, lipid diffusivity, and collective membrane undulations are at least an order of magnitude faster. Here we study the collective dynamics of dimyristoylphosphatidylglycerol (DMPG, di 14:0 PG) using neutron spin echo spectroscopy throughout its anomalous phase transition that occurs over a 12 °C–20° C wide temperature window. Our results reveal that the membranes are softer and more dynamic during the phase transition than at higher temperatures corresponding to the fluid phase and provide direct experimental evidence for the predicted increase in membrane fluctuations during lipid melting. These results provide new insights into the nanoscale lipid membrane dynamics during the melting transition and demonstrate how these dynamics are coupled to changes in the membrane structure.
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title_short	Enhanced dynamics in the anomalous melting regime of DMPG lipid membranes
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