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Combinatorial Chemistry & High Throughput Screening


ISSN (Print): 1386-2073
ISSN (Online): 1875-5402

Serum-Stable RNA Aptamers to an Invariant Surface Domain of Live African Trypanosomes

Author(s): H. Ulrich Goringer, Martin Zacharias, Markus Engstler, Matthias Homann and Mihaela Lorger

Volume 9, Issue 7, 2006

Page: [491 - 499] Pages: 9

DOI: 10.2174/138620706777935324

Price: $65


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-NH2-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.

Keywords: G-quartet, African sleeping sickness, Trypanosoma brucei, African trypanosomes, RNA aptamer, SELEX

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