Abstract：
:Apolipoproteins are a key component of lipid transport in the circulatory system and share a number of structural features that facilitate this role. When bound to lipoprotein particles, these proteins are relatively stable. However, in the absence of lipids they display conformational instability and a propensity to aggregate into amyloid fibrils. Apolipoprotein C-II (apoC-II) is a member of the apolipoprotein family that has been well characterised in terms of its misfolding and aggregation. In the absence of lipid, and at physiological ionic strength and pH, apoC-II readily forms amyloid fibrils with a twisted ribbon-like morphology that are amenable to a range of biophysical and structural analyses. Consistent with its lipid binding function, the misfolding and aggregation of apoC-II are substantially affected by the presence of lipid. Short-chain phospholipids at submicellar concentrations significantly accelerate amyloid formation by inducing a tetrameric form of apoC-II that can nucleate fibril aggregation. Conversely, phospholipid micelles and bilayers inhibit the formation of apoC-II ribbon-type fibrils, but induce slow formation of amyloid with a distinct straight fibril morphology. Our studies of the effects of lipid at each stage of amyloid formation, detailed in this chapter, have revealed complex behaviour dependent on the chemical nature of the lipid molecule, its association state, and the protein:lipid ratio.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Ryan TM,Mok YF,Howlett GJ,Griffin MDdoi
10.1007/978-3-319-17344-3_7subject
Has Abstractpub_date
2015-01-01 00:00:00pages
157-74eissn
0065-2598issn
2214-8019journal_volume
855pub_type
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