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J. Lipid Res.
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Journal of Lipid Research, Vol. 42, 51-59, January 2001
Copyright © 2001 by Lipid Research, Inc.


Original Article

The N-terminal 17% of apoB binds tightly and irreversibly to emulsions modeling nascent very low density lipoproteins

Haya Herscovitza, Arie Derksena, Mary T. Walsha, C. James McKnighta, Donald L. Gantza, Margarita Hadzopoulou-Cladarasb, Vassilis Zannisb, Cynthia Currya, and Donald M. Smalla
a Department of Biophysics, Cardiovascular Institute, Center for Advanced Biomedical Research, Boston University School of Medicine, Boston, MA 02118
b Department of Medicine, Cardiovascular Institute, Center for Advanced Biomedical Research, Boston University School of Medicine, Boston, MA 02118

Correspondence to: Haya Herscovitz, To whom correspondence should be addressed., haya{at}med-biophd.bu.edu (E-mail)

The N-terminal 17% of apolipoprotein B (apoB-17) readily associates with dimyristoylphosphatidylcholine (DMPC) multilamellar vesicles (MLV) to form large (240-Å diameter) discoidal particles. Because apoB is normally secreted with triacylglycerol (TAG)-rich lipoproteins, we studied the binding of apoB-17 to triolein-rich emulsions modeling nascent TAG-rich very low density-like lipoproteins. Emulsions with the following composition (by weight) were prepared: 85;–89% triolein, 1.1;–1.4% cholesterol, and 10;–14% phosphatidylcholines (PC) including either egg yolk (EY)-, dimyristoyl (DM)-, or dipalmitoyl (DP)-PC representing (at 25°C), respectively, a fluid surface, a surface at transition, and a mainly solid surface. The respective sizes were 1,260 ± 500, 1,070 ± 450, and 830 ± 300 Å mean diameter. The emulsions were incubated with conditioned medium containing apoB-17, and then reisolated by ultracentrifugation. Analysis of the emulsion-bound proteins by gel electrophoresis showed that all three emulsions bound primarily apoB-17. The DPPC emulsions bound more apoB-17 than EYPC or DMPC emulsions. Immunoaffinity-purified apoB-17 exhibited saturable, high affinity binding to EYPC and DPPC emulsions. The respective Kd values were 32 ± 23 and 85 ± 27 nM and capacities (N) were 10 and 58 molecules of apoB-17 per particle. When apoB-17 bound to emulsions was incubated with DMPC MLV at 26°C for 18 h, it remained bound to the emulsions, indicating that once bound to these emulsions it is unable to exchange off and solubilize DMPC into discs. In contrast, apoE-3 bound to emulsions dissociated from the emulsions when incubated with DMPC MLV and formed discs.

Thus, apoB-17 binds strongly and irreversibly to emulsions modeling nascent lipoproteins. It therefore may play an important role in the stabilization of nascent VLDL and chylomicrons. Herscovitz, H., A. Derksen, M. T. Walsh, C. J. McKnight, D. L. Gantz, M. Hadzopoulou-Cladaras, V. Zannis, C. Curry, and D. M. Small. The N-terminal 17% of apoB binds tightly and irreversibly to emulsions modeling nascent very low density lipoproteins. J. Lipid Res. 2001. 42: 51;–59.

Supplementary key words: truncated forms of apoB, multilamellar vesicles, EYPC, DPPC


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