ArticlebioRxiv : the preprint server for biology2024
Varying the position of phospholipid acyl chain unsaturation modulates hopanoid and sterol ordering.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors at 3 institutions in 2 countries.
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Abstract
The cell membrane must balance mechanical stability with fluidity to function as both a barrier and an organizational platform. Key to this balance is the thermodynamic ordering of lipids. Most Eukaryotes employ sterols, which are uniquely capable of modulating lipid order to decouple membrane stability from fluidity. Ancient sterol analogues known as hopanoids are found in many bacteria and are proposed as ancestral ordering lipids. The juxtaposition of sterols and hopanoids in extant organisms prompts us to ask why both pathways persist, especially in light of their convergent ability to order lipids. We reveal that both hopanoids and sterols order unsaturated phospholipids differently based on the position of double bonds in the phospholipid's acyl chain. We find that cholesterol and diplopterol's methyl group distributions lead to distinct effects on unsaturated lipids. In
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