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Molecular and Cellular Biology, April 2005, p. 2573-2582, Vol. 25, No. 7
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.7.2573-2582.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Nuclear Export Is Evolutionarily Conserved in CVC Paired-Like Homeobox Proteins and Influences Protein Stability, Transcriptional Activation, and Extracellular Secretion

Shirley K. Knauer, Gert Carra, and Roland H. Stauber*

Georg-Speyer-Haus, Institute for Biomedical Research, Frankfurt, Germany

Received 27 October 2004/ Returned for modification 9 December 2004/ Accepted 15 December 2004

Homeodomain transcription factors control a variety of essential cell fate decisions during development. To understand the developmental regulation by these transcription factors, we describe here the molecular analysis of paired-like CVC homeodomain protein (PLC-HDP) trafficking. Complementary experimental approaches demonstrated that PLC-HDP family members are exported by the Crm1 pathway and contain an evolutionary conserved leucine-rich nuclear export signal. Importantly, inactivation of the nuclear export signal enhanced protein stability, resulting in increased transactivation of transfected reporters and decreased extracellular secretion. In addition, PLC-HDPs harbor a conserved active nuclear import signal that could also function as a protein transduction domain. In our study, we characterized PLC-HDPs as mobile nucleocytoplasmic shuttle proteins with the potential for unconventional secretion and intercellular transfer. Nucleocytoplasmic transport may thus represent a conserved control mechanism to fine-tune the transcriptional activity of PLC-HDPs prerequisite for regulating and maintaining the complex expression pattern during development.

* Corresponding author. Mailing address: Georg-Speyer-Haus, Institute for Biomedical Research, Paul-Ehrlich-Str. 42-44, D-60596 Frankfurt, Germany. Phone: (49) 69-63395-222. Fax: (49) 69-63395-145. E-mail: stauber{at}em.uni-frankfurt.de.

Molecular and Cellular Biology, April 2005, p. 2573-2582, Vol. 25, No. 7
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.7.2573-2582.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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