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PEDS Advance Access published online on August 16, 2004

Protein Engineering Design and Selection, doi:10.1093/protein/gzh062
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Received June 15, 2004
Accepted July 28, 2004

Article

Analysis and prediction of leucine-rich nuclear export signals

Tanja la Cour 1, Lars Kiemer 1, Anne Mølgaard 1, Ramneek Gupta 1, Karen Skriver 2, Søren Brunak 1*

1 Center for Biological Sequence Analysis, Biocentrum-DTU, Technical University of Denmark, Building 208, DK-2800 Lyngby, Denmark
2 Department of Protein Chemistry, Institute of Molecular Biology, University of Copenhagen, Øster Farimagsgade 2A, DK-1353 Copenhagen K, Denmark

* To whom correspondence should be addressed. E-mail: brunak{at}cbs.dtu.dk.


   Abstract

We present here a thorough analysis of nuclear export signals and a prediction server, which we have made publicly available. The machine learning prediction method is a significant improvement over the generally used consensus patterns. Nuclear export signals (NES) are extremely important regulators of the subcellular location of proteins. This regulation has impact on transcription and other nuclear processes, which are fundamental to the viability of the cell. Nuclear export signals are studied in relation to cancer, the cell-cycle, cell differentiation and other important aspects of molecular biology. Our conclusion from this analysis is that the most important properties of NES are accessibility and flexibility allowing relevant proteins to interact with the signal. Furthermore, we show that not only the known hydrophobic residues are important in defining a nuclear export signals. We employ both neural networks and hidden Markov models in the prediction algorithm and verify the method on the most recently discovered nuclear export signals.

The NES predictor (NetNES) is made available for general use at http://www.cbs.dtu.dk/.

Keywords: Nuclear export signals; NES; analysis; prediction; structure.
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