title: Characterization of alternate and truncated forms of murine c-myb proteins.
abstract: The expression of c-myb proteins in transformed and normal murine cells was investigated. Two c-myb proteins, p75c-myb and p90c-myb, were detected in normal thymocytes and cell lines with intact c-myb genes. These most likely differ by the inclusion of additional amino acids encoded by an alternatively spliced c-myb mRNA. The use of this alternative exon is therefore not a feature exclusively of those cells with viral integrations in their c-myb gene. Smaller c-myb proteins in myeloid leukemic cell lines with rearranged c-myb genes were also characterized. Viral integration into the 5' region of the c-myb gene in the W265 and W274 cell lines leads to the synthesis in each case of two amino-terminally truncated c-myb proteins. By contrast, in NFS60 cells, viral integration into a more 3' region of the c-myb locus (but upstream of an alternate exon) leads to the production of a single p50c-myb protein.
authors.affiliation: Ludwig Institute for Cancer Research, Royal Melbourne Hospital, Parkville, Australia.
authors.forename: R G
authors.initials: RG
authors.lastname: Ramsay
authors.forename: S
authors.initials: S
authors.lastname: Ishii
authors.forename: Y
authors.initials: Y
authors.lastname: Nishina
authors.forename: G
authors.initials: G
authors.lastname: Soe
authors.forename: T J
authors.initials: TJ
authors.lastname: Gonda
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins / Q000032:analysis; D015153:Blotting, Western; D002461:Cell Line, Transformed; D002874:Chromosome Mapping; D004262:DNA Restriction Enzymes; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005786:Gene Expression Regulation; D005822:Genetic Vectors; D051379:Mice; D008807:Mice, Inbred BALB C; D010957:Plasmids; D014176:Protein Biosynthesis; D011518:Proto-Oncogene Proteins / Q000235:genetics* / Q000276:immunology; D020598:Proto-Oncogene Proteins c-myb; D011519:Proto-Oncogenes; D011817:Rabbits; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D001426:Bacterial Proteins; D011518:Proto-Oncogene Proteins; D020598:Proto-Oncogene Proteins c-myb; D004262:DNA Restriction Enzymes