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• W2031969331 abstract "Based upon state of the art biophysical experimentation, this article focuses on the different structural arrangements exchangeable apolipoproteins achieve when placed on Langmuir monolayers and subjected to changes in lateral pressure. We have studied the monolayers of apolipoproteins CI, CIII, AI, AII, and E that show as secondary structure a high percentage of amphipathic alpha-helix. This has been achieved employing techniques such as Brewster angle microscopy, synchrotron X-ray diffraction, and surface pressure measurements. In addition, the lateral order of protein arrays has been also studied by atomic force microscopy. These monolayers show that a phase transition from a two-dimensional disorder fluid to an ordered state is detected at relatively high lateral pressure, where unusual one-dimensional solid phases are discovered. While several helices that conform the apolipoprotein are confined to the interface, others are uniformly tilted toward the hydrophobic air or the phospholipid fatty acid chains. Our results suggest that a similar ordering might also occur when these apolipoproteins are attached to a lipoprotein particle such as a high density lipoprotein (HDL) particle. Therefore, changes from a nascent or discoidal HDL to a mature spherical HDL might in parallel involve structural changes as those described in our Langmuir interfaces. Current experimentation is being carried out in order to elucidate if the structural states already found are related to the efficiency of lipid transfer between lipoprotein particles or lipoproteins and the plasma membrane of cells, as well as receptor ligand recognition." @default.
• W2031969331 created "2016-06-24" @default.
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• W2031969331 date "2004-11-01" @default.
• W2031969331 modified "2023-09-25" @default.
• W2031969331 title "In search of new structural states of exchangeable apolipoproteins" @default.
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• W2031969331 doi "https://doi.org/10.1016/j.bbrc.2004.09.045" @default.
• W2031969331 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15474451" @default.
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