Menin, the multiple endocrine neoplasia type 1 gene product, exhibits GTP-hydrolyzing activity in the presence of the tumor metastasis suppressor nm23.

Abstract	MEN1, the gene responsible for multiple endocrine neoplasia type 1, is a tumor suppressor gene that encodes a protein called menin, of unknown function with no homology to any known protein. Here we demonstrate that menin interacts with a putative tumor metastasis suppressor nm23H1/nucleoside diphosphate (NDP) kinase A in mammalian cells. Given the roles of nm23 as a multi-functional protein, we searched for the possible function of menin. Menin has no effect on the known activities of nm23; that is, nucleoside diphosphate kinase, protein kinase, or GTPase-activating protein for Ras-related GTPase Rad. However, we found that menin hydrolyzes GTP to GDP efficiently in the presence of nm23, whereas nm23 or menin alone shows little or no detectable GTPase activity. Furthermore, menin contains sequence motifs similar to those found in all known GTPases or GTP-binding proteins and shows low affinity but specific binding to GTP/GDP. These results suggest that menin is an atypical GTPase stimulated by nm23.
Authors	Hiroko Yaguchi, Naganari Ohkura, Toshihiko Tsukada, Ken Yamaguchi
Journal	The Journal of biological chemistry (J Biol Chem) Vol. 277 Issue 41 Pg. 38197-204 (Oct 11 2002) ISSN: 0021-9258 [Print] United States
PMID	12145286 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References	Antigens, Neoplasm Biomarkers, Tumor MEN1 protein, human NM23 Nucleoside Diphosphate Kinases Neoplasm Proteins Proto-Oncogene Proteins Recombinant Fusion Proteins Transcription Factors Guanosine Triphosphate NME1 protein, human Nucleoside-Diphosphate Kinase GTP Phosphohydrolases Monomeric GTP-Binding Proteins
Topics	Amino Acid Motifs Animals Antigens, Neoplasm (metabolism) Biomarkers, Tumor Cell Line GTP Phosphohydrolases (genetics, metabolism) Genes, Reporter Genes, Tumor Suppressor Guanosine Triphosphate (metabolism) Humans Monomeric GTP-Binding Proteins (metabolism) Multiple Endocrine Neoplasia Type 1 (genetics) Mutation, Missense NM23 Nucleoside Diphosphate Kinases Neoplasm Proteins (genetics, metabolism) Nucleoside-Diphosphate Kinase (metabolism) Proto-Oncogene Proteins Recombinant Fusion Proteins (genetics, metabolism) Transcription Factors (metabolism)

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