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Serum-stable RNA aptamers to an invariant surface domain of live African trypanosomes.

Homann, Matthias and Lorger, Mihaela and Engstler, Markus and Zacharias, Martin and Göringer, H. Ulrich (2006):
Serum-stable RNA aptamers to an invariant surface domain of live African trypanosomes.
9, In: Combinatorial chemistry & high throughput screening, (7), pp. 491-9. ISSN 1386-2073,
[Article]

Abstract

African trypanosomes are extracellular blood parasites that cause sleeping sickness in humans and Nagana in cattle. The therapeutics used to control and treat these diseases are very ineffective and thus, the development of new drugs is urgently needed. We have previously suggested to use trypanosome-specific RNA aptamers as tools for the development of novel trypanocidal compounds. Here, we report the selection of a 2'-NH(2)-modified RNA aptamer that binds to live trypanosomes with an affinity of 70 +/- 15 nM. The aptamer adopts a stable G-quartet structure and has a half-life in human serum of > 30 h. RNA binding is restricted to the flagellar attachment zone, located between the cell body and the flagellum of the parasite. We demonstrate that antigen-tagged preparations of the aptamer can bind to live trypanosomes and that they can be used to re-direct immunoglobulins to the parasite surface.

Item Type: Article
Erschienen: 2006
Creators: Homann, Matthias and Lorger, Mihaela and Engstler, Markus and Zacharias, Martin and Göringer, H. Ulrich
Title: Serum-stable RNA aptamers to an invariant surface domain of live African trypanosomes.
Language: English
Abstract:

African trypanosomes are extracellular blood parasites that cause sleeping sickness in humans and Nagana in cattle. The therapeutics used to control and treat these diseases are very ineffective and thus, the development of new drugs is urgently needed. We have previously suggested to use trypanosome-specific RNA aptamers as tools for the development of novel trypanocidal compounds. Here, we report the selection of a 2'-NH(2)-modified RNA aptamer that binds to live trypanosomes with an affinity of 70 +/- 15 nM. The aptamer adopts a stable G-quartet structure and has a half-life in human serum of > 30 h. RNA binding is restricted to the flagellar attachment zone, located between the cell body and the flagellum of the parasite. We demonstrate that antigen-tagged preparations of the aptamer can bind to live trypanosomes and that they can be used to re-direct immunoglobulins to the parasite surface.

Journal or Publication Title: Combinatorial chemistry & high throughput screening
Volume: 9
Number: 7
Divisions: 10 Department of Biology > Postranscriptional Gene Regulation and RNA Therapeutics
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10 Department of Biology
Date Deposited: 03 Nov 2011 13:03
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