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. 2002 Aug 1;365(Pt 3):783–789. doi: 10.1042/BJ20020060

The 4.1/ezrin/radixin/moesin domain of the DAL-1/Protein 4.1B tumour suppressor interacts with 14-3-3 proteins.

Tingxi Yu 1, Victoria A Robb 1, Vinita Singh 1, David H Gutmann 1, Irene F Newsham 1
PMCID: PMC1222735  PMID: 11996670

Abstract

The Protein 4.1 family contains at least two members that function as tumour suppressors, the neurofibromatosis 2 gene product merlin and the recently identified differentially expressed in adenocarcinoma of the lung (DAL-1)/Protein 4.1B molecule. DAL-1/Protein 4.1B loss is observed in a variety of tumours, including breast and lung cancers as well as meningiomas. We have previously demonstrated that DAL-1/Protein 4.1B interacts with some but not all merlin-binding proteins, raising the possibility that DAL-1/Protein 4.1B associates with additional unique proteins specific to its function as a negative growth regulator. Using yeast two-hybrid interaction cloning, we identified three 14-3-3 isoforms, beta, gamma and eta, to be DAL-1/Protein 4.1B-binding proteins. These interactions were verified by using glutathione S-transferase affinity chromatography in vitro and co-immunoprecipitation in vivo. The interaction of 14-3-3 with DAL-1/Protein 4.1B was specific, as 14-3-3 did not bind to the related Protein 4.1 family members merlin, ezrin or radixin. The DAL-1/Protein 4.1B domain that mediates 14-3-3 binding was mapped to residues Pro(244) and Leu(280) within the 4.1/ezrin/radixin/moesin domain. The identification of this novel DAL-1/Protein 4.1B-interacting protein represents the first step towards elucidating its potentially unique mechanism of action.

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Selected References

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