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Nucleic Acids Research, 2001, Vol. 29, No. 17 3469-3476
© 2001 Oxford University Press

Ski interacts with the evolutionarily conserved SNW domain of Skip

Tulasiram Prathapam, Christian Kühne, Michael Hayman1 and Lawrence Banks*

International Centre for Genetic Engineering and Biotechnology, Padriciano 99, I-34012, Trieste, Italy and 1Department of Molecular Genetics and Microbiology, Life Sciences Building, SUNY at Stony Brook, NY 11713, USA

Ski interacting protein (Skip) has been found to bind to the highly conserved region of Ski, which is required for its transforming activity. Ski is a unique oncoprotein that is involved in inducing both transformation and differentiation. At the molecular level, Ski has been shown to exhibit either co-activator or co-repressor activity depending on the cellular and promoter context. We were interested in further elucidating the biological implications of the Ski–Skip interaction. Here we have identified the SNW domain of Skip as the interaction region for Ski. This domain of Skip is highly conserved in all the Skip homologues identified from different species. Using a series of reporter plasmids, we show that Skip is a potent transcriptional activator of many different promoters, the activity of which was also mapped to the conserved core SNW domain of the protein. Addition of excess Ski further augmented the transcriptional activities of Skip, suggesting that one of the ways in which Ski brings about transformation is by binding and cooperating with the SNW domain of Skip in transcriptional activation.

* To whom correspondence should be addressed. Tel: +39 040 3757328; Fax: +39 040 226555; Email: banks{at}icgeb.trieste.it


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