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Structure of apolipoprotein B-100 in low density lipoproteins
Open accessAbstract
There is general consensus that amphipathic alpha-helices and beta sheets represent the major lipid-associating motifs of apolipoprotein (apo)B-100. In this review, we examine the existing experimental and computational evidence for the pentapartite domain structure of apoB. In the pentapartite nomenclature presented in this review (NH(2)-betaalpha(1)-beta(1)-alpha(2)-beta(2)-alpha(3)-COOH), the original alpha(1) globular domain (Segrest, J. P. et al. 1994. Arterioscler. Thromb. 14: 1674;-1685) is expanded to include residues 1;-1,000 and renamed the betaalpha(1) domain. This change reflects the likelihood that the betaalpha(1) domain, like lamprey lipovitellin, is a globular composite of alpha-helical and beta-sheet secondary structures that participates in lipid accumulation in the co-translationally assembled prenascent triglyceride-rich lipoprotein particles. Evidence is presented that the hydrophobic faces of the amphipathic beta sheets of the beta(1) and beta(2) domains of apoB-100 are in direct contact with the neutral lipid core of apoB-containing lipoproteins and play a role in core lipid organization. Evidence is also presented that these beta sheets largely determine LDL particle diameter. Analysis of published data shows that with a reduction in particle size, there is an increase in the number of amphipathic helices of the alpha(2) and alpha(3) domains associated with the surface lipids of the LDL particle; these increases modulate the surface pressure decreases caused by a reduction in radius of curvature. The properties of the LDL receptor-binding region within the overall domain structure of apoB-100 are also discussed. Finally, recent three-dimensional models of LDL obtained by cryoelectron microscopy and X-ray crystallography are discussed. These models show three common features: a semidiscoidal shape, a surface knob with the dimensions of the betaC globular domain of lipovitellin, and planar multilayers in the lipid core that are approximately 35 A apart; the multilayers are thought to represent cholesteryl ester in the smectic phase. These models present a conundrum: are LDL particles circulating at 37 degrees C spheroidal in shape, as generally assumed, or are they semidiscoidal in shape, as suggested by the models? The limited evidence available supports a spheroidal shape.
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Metadata
- Authors
- Segrest, J. P., Jones, M. K., De Loof, H., & Dashti, N.
- Venue
- Journal of Lipid Research
- Publisher
- Elsevier BV
- Published
- 2001-09
- Volume
- 42
- Issue
- 9
- Pages
- 1346-1367
- ISSN
- 0022-2275 (ISSN-L)
- OpenAlex
- W2305216237
- Cited by
- 522
- References
- 3
- FWCI
- 17.70
- Type
- journal article
- Language
- en
- Open access
- hybrid
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