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1: Oncogene. 2001 Aug 16;20(36):4917-25.
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The tumor suppressor protein menin interacts with NF-kappaB proteins and inhibits NF-kappaB-mediated transactivation.

Heppner C, Bilimoria KY, Agarwal SK, Kester M, Whitty LJ, Guru SC, Chandrasekharappa SC, Collins FS, Spiegel AM, Marx SJ, Burns AL.

Metabolic Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA.

Multiple endocrine neoplasia type 1 is an autosomal dominant tumor syndrome. Manifestations include neoplasms of the parathyroid glands, enteropancreatic neuroendocrine cells, and the anterior pituitary gland. The MEN1 tumor suppressor gene encodes menin, a 610 amino acid nuclear protein without sequence homology to other proteins. To elucidate menin function, we used immunoprecipitation to identify interacting proteins. The NF-kappaB proteins p50, p52 and p65 were found to interact specifically and directly with menin in vitro and in vivo. The region of NF-kappaB proteins sufficient for binding to menin is the N-terminus. Furthermore, amino acids 305-381 of menin are essential for this binding. Menin represses p65-mediated transcriptional activation on NF-kappaB sites in a dose-dependent and specific manner. Also, PMA (phorbol 12-myristate 13-acetate)-stimulated NF-kappaB activation is suppressed by menin. These observations suggest that menin's ability to interact with NF-kappaB proteins and its modulation of NF-kappaB transactivation contribute to menin's tumor suppressor function.

PMID: 11526476 [PubMed - indexed for MEDLINE]