title: Non-muscle myosin heavy chain as a possible target for protein encoded by metastasis-related mts-1 gene.
abstract: The mts-1 gene is associated with the expression of the metastatic phenotype of tumor cells. The protein product of the mts-1 gene belongs to the S100 family of Ca(2+)-binding proteins with unknown biochemical function. In the present work, monoclonal anti-Mts-1 antibodies were used to isolate and characterize Mts-1 protein possible targets. Mts-1 protein can be immunoprecipitated by both anti-Mts-1 and anti-myosin antibodies as a complex with myosin from lysates of different mouse and human cell lines. Precipitation of myosin by anti-Mts-1 antibodies is specific and depends on the presence of Mts-1 protein. Ca(2+)-dependent association between Mts-1 protein and the heavy chain of non-muscle myosin was demonstrated by blot overlay technique. Furthermore, association between myosin and Mts-1 was confirmed by sucrose gradient analysis. Finally, immunofluorescent staining of the mouse mammary adenocarcinoma cell line showed that Mts-1 protein is co-localized with the myosin complex. The data suggest that the target for Mts-1 protein is a heavy chain of non-muscle myosin.
authors.affiliation: Department of Molecular Cancer Biology, Danish Cancer Society, Copenhagen.
authors.forename: M V
authors.initials: MV
authors.lastname: Kriajevska
authors.forename: M N
authors.initials: MN
authors.lastname: Cardenas
authors.forename: M S
authors.initials: MS
authors.lastname: Grigorian
authors.forename: N S
authors.initials: NS
authors.lastname: Ambartsumian
authors.forename: G P
authors.initials: GP
authors.lastname: Georgiev
authors.forename: E M
authors.initials: EM
authors.lastname: Lukanidin
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009132:Muscles / Q000378:metabolism; D009218:Myosins / Q000378:metabolism*; D009362:Neoplasm Metastasis / Q000235:genetics; D000071999:S100 Calcium-Binding Protein A4; D009418:S100 Proteins; D014407:Tumor Cells, Cultured
chemical_list: D002135:Calcium-Binding Proteins; D000071999:S100 Calcium-Binding Protein A4; D009418:S100 Proteins; C470944:S100a4 protein, mouse; C077591:S100A4 protein, human; D009218:Myosins