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Coupled transcription-and-translation in Xenopus oocyte and egg extracts

Paper ID Volume ID Publish Year Pages File Format Full-Text
25596 43583 2006 8 PDF Available
Title
Coupled transcription-and-translation in Xenopus oocyte and egg extracts
Abstract

Coinjection of T7 promoter-driven plasmids and T7 RNA polymerase (T7 RNAP) into Xenopus oocytes results in robust protein synthesis, due to simultaneous gene transcription-and-translation (TnT) in the oocyte cytoplasm [Geib, S., Sandoz, G., Carlier, E., V. Cornet, Cheynet-Sauvion, V., De Waard, M., 2001. A novel Xenopus oocyte expression system based on cytoplasmic coinjection of T7-driven plasmids and purified T7-RNA polymerase. Receptors Channels 7, 331–343; Tokmakov, A.A., Matsumoto, E., Shirouzu, M., Yokoyama, S., 2006. Coupled cytoplasmic transcription-and-translation—a method of choice for heterologous gene experession in Xenopus oocytes. J. Biotechnol. 122, 5–15]. In the present study, we demonstrate that the TnT reaction of protein synthesis can be reconstituted in cell-free extracts of Xenopus oocytes and eggs. Similar to the reaction in oocytes, the effective coupling of bacteriophage T7 RNAP-mediated transcription with the eukaryotic translation machinery takes place in the Xenopus oocyte and egg extracts. However, the kinetics of protein and RNA production in the extracts are quite different from those observed in oocytes. Potent RNA synthesis in the extracts starts immediately after the addition of T7 promoter-driven DNA and T7 RNAP and continues for about 30 min, followed by RNA degradation. The protein product is detectable in the extracts in 15 min after the initiation of the TnT reaction. Efficient protein synthesis in the extracts continues for about 1 h. The productivity of this expression system can be boosted by the additions of an RNase inhibitor and an ATP-regeneration system, and by extract dilution. Kinetic analyses suggested that extending the lifetime of the extracts would further increase their productivity.

Keywords
Expression techniques; Coupled transcription and translation; Cell-free protein synthesis; Xenopus oocyte and egg extracts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 125, Issue 4, 1 October 2006, Pages 557–564
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us