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10.1007/978-3-319-17344-3_8

http://scihub22266oqcxt.onion/10.1007/978-3-319-17344-3_8
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C5610898!5610898!26149931
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suck abstract from ncbi


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pmid26149931      Adv+Exp+Med+Biol 2015 ; 855 (ä): 175-211
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  • Amyloid-Forming Properties of Human Apolipoproteins: Sequence Analyses and Structural Insights #MMPMID26149931
  • Das M; Gursky O
  • Adv Exp Med Biol 2015[]; 855 (ä): 175-211 PMID26149931show ga
  • Apolipoproteins are protein constituents of lipoproteins that transport cholesterol and fat in circulation and are central to cardiovascular health and disease. Soluble apolipoproteins can transiently dissociate from the lipoprotein surface in a labile free form that can misfold, potentially leading to amyloid disease. Misfolding of apoA-I, apoA-II, and serum amyloid A (SAA) causes systemic amyloidoses, apoE4 is a critical risk factor in Alzheimer?s disease, and apolipoprotein misfolding is also implicated in cardiovascular disease. To explain why apolipoproteins are over- represented in amyloidoses, it was proposed that the amphipathic ?-helices, which form the lipid surface-binding motif in this protein family, have high amyloid-forming propensity. Here, we use 12 sequence-based bioinformatics approaches to assess amyloid-forming potential of human apolipoproteins and to identify segments that are likely to initiate ?-aggregation. Mapping such segments on the available atomic structures of apolipoproteins helps explain why some of them readily form amyloid while others do not. Our analysis shows that nearly all amyloidogenic segments: (i) are largely hydrophobic, (ii) are located in the lipid-binding amphipathic ?-helices in the native structures of soluble apolipoproteins, (iii) are predicted in both native ?-helices and ?-sheets in the insoluble apoB, and (iv) are predicted to form parallel in-register ?-sheet in amyloid. Most of these predictions have been verified experimentally for apoC-II, apoA-I, apoA-II and SAA. Surprisingly, the rank order of the amino acid sequence propensity to form amyloid (apoB > apoA-II > apoC-II ? apoA-I, apoC-III, SAA, apoC-I > apoA-IV, apoA-V, apoE) does not correlate with the proteins? involvement in amyloidosis. Rather, it correlates directly with the strength of the protein-lipid association, which increases with increasing protein hydrophobicity. Therefore, the lipid surface-binding function and the amyloid-forming propensity are both rooted in apolipoproteins? hydrophobicity, suggesting that functional constraints make it difficult to completely eliminate pathogenic apolipoprotein misfolding. We propose that apolipoproteins have evolved protective mechanisms against misfolding, such as the sequestration of the amyloidogenic segments via the native protein-lipid and protein-protein interactions involving amphipathic ?-helices and, in case of apoB, ?-sheets.
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