Journal Article

PUBDB-2022-06777

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png pH-Dependent physicochemical properties of ornithine lipid in mono- and bilayers

Mukhina, T.Extern* ; Pabst, G.Extern* ; Ruysschaert, J.-M. ; Brezesinski, G.Extern* ; Schneck, E. (Corresponding author)Extern*

2022
RSC Publ. Cambridge

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Please use a persistent id in citations: doi:10.1039/D2CP01045C  doi:10.3204/PUBDB-2022-06777

Abstract: In certain bacteria, phosphatidylethanolamine lipids (PEL) get largely replaced by phosphate-free ornithine lipids (OL) under conditions of phosphate starvation. It has so far been unknown how much these two lipid types deviate in their physicochemical properties, and how strongly bacteria thus have to adapt in order to compensate for the difference. Here, we use differential scanning calorimetry, X-ray scattering, and X-ray fluorescence to investigate the properties of OL with saturated C14 alkyl chains in mono- and bilayers. OL is found to have a greater tendency than chain-analogous PEL to form ordered structures and, in contrast to PEL, even a molecular superlattice based on a hydrogen bonding network between the headgroups. This superlattice is virtually electrically uncharged and persists over a wide pH range. Our results indicate that OL and PEL behave very differently in ordered single-component membranes but may behave more similarly in fluid multicomponent membranes.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20190719 (I-20190719) (I-20190719)
3. FS-Proposal: I-20190800 (I-20190800) (I-20190800)

Experiment(s):

1. PETRA Beamline P08 (PETRA III)

Appears in the scientific report 2022

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Database coverage:
; ; ; Allianz-Lizenz / DFG ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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