Startseite The pH-Dependent Interaction of Cinnamomin with Lipid Membranes Investigated by Fluorescence Methods
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The pH-Dependent Interaction of Cinnamomin with Lipid Membranes Investigated by Fluorescence Methods

  • Rong-gui Hu , Shuang Tang und Wang-yi Liu
Veröffentlicht/Copyright: 1. Juni 2005
Biological Chemistry
Aus der Zeitschrift Band 381 Heft 7

Abstract

Cinnamomin, a new type II ribosomeinactivating protein (RIP), was found to be able to induce the release of calcein loaded in lecithin small unilamellar vesicles and the fusion or aggregation of the lecithin liposomes. Such induction could be promoted several fold by a pH 5.0 environment, a condition similar to that in endocytic vesicles. Lowering the pH from 7.5 to 5.0 evoked conformational changes of cinnamomin and unmasked its hydrophobic areas, including the exposure of 1-anilino-8-naphthalenesulfonate (1,8-ANS) binding sites of the molecule. Some tryptophan residues with affinity to acrylamide were demonstrated to participate in the lipidprotein interaction. The pH dependent fusogenicity of type II RIP might suggest its in vivo function as a fusogen to exert its cytotoxicity.

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Published Online: 2005-06-01
Published in Print: 2000-07-04

Copyright © 2000 by Walter de Gruyter GmbH & Co. KG

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