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Menin, a tumor suppressor, associates with nonmuscle myosin II-A heavy chain.

Authors:
Obungu VH, Lee Burns A, Agarwal SK, Chandrasekharapa SC, Adelstein RS, Marx SJ
Affiliation:
Journal:
Oncogene

Abstract

MEN1 is a likely tumor suppressor gene that encodes a novel protein, menin. Menin is a 610 amino-acid residue protein with as yet unknown function(s). We have used tandem affinity purification and mass spectroscopy to isolate and identify proteins associating with menin from cultured HeLa cell extracts. This strategy has resulted in the isolation and identification of nonmuscle myosin type II-A heavy chain (NMHC II-A) as a menin interacting protein. This interaction was confirmed by glutathione-S-transferase pulldown assays, by coimmunoprecipitation, and by actin selection of myosin. We have further identified the amino-terminal region of menin and the head domain of NMHC II-A to be regions required for this interaction. Moreover menin was seen to colocalize with this myosin isoform in the cleavage furrow of dividing cells by indirect immunofluoresence. These data indicate that menin through binding to NMHC II-A could participate in cell division and in other processes that involve NMHC II-A.

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