Study on size growth in the vesicle formation upon detergent removal from phospholipid/ detergent mixed micelles |
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Authors: | C Sun M Ueno |
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Institution: | (1) Faculty of Pharmaceutical Sciences Toyama Medical and Pharmaceutical University, 2630 Sugitani Toyama 930-0194, Japan e-mail: mueno@ms.toyama-mpu.ac.jp Tel.: +81-76-434-7565 Fax: +81-76-434-5050, JP |
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Abstract: | When 3-(3-cholamidopropyl)dimethylammonio]-1-propane sulfonate (CHAPS) was removed from the mixed CHAPS/EggPC micelles,
large vesicles were prepared by dialysis or by slow step-by-step dilution, but small vesicles were prepared by fast one-step
dilution. When sodium cholate was removed from the sodium cholate/EggPC micelles, small vesicles formed either by dialysis
or by dilution; however, in the presence of 5 mM Ca2+ large vesicles were produced by dialysis, while small vesicles were prepared by dilution. The size growth was related to
a detergent-induced fusion of the vesicles containing a large amount of detergent. Using spectrophotometry, quasielastic light
scattering and freeze–fracture electron microscopy the fusion events were investigated both through the process of vesicle
solubilization by adding detergent and through the process of vesicle formation by diluting a mixed micelle. The results suggest
that a rapid CHAPS-induced fusion of the vesicles led to the large resultant vesicles and that no fusion of vesicles containing
sodium cholate is responsible for the formation of small vesicles. Furthermore, the ultimate vesicle size related to rapid
or slow detergent removal is dependent on the kinetic aspects of the fusion.
Received: 19 August 1999 Accepted: 18 February 2000 |
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Keywords: | Vesicle formation Detergent removal Size growth Detergent-induced fusion Different dilutions |
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