Genomic organization and expression of Tpl-2 in normal cells and Moloney murine leukemia virus-induced rat T-cell lymphomas: activation by provirus insertion.
Tpl-2 is a gene encoding a protein kinase which is primarily expressed in normal spleen, thymus, and lung tissue and is activated by provirus insertion in Moloney murine leukemia virus-induced T-cell lymphomas during the late stages of oncogenesis. Tpl-2 is composed of eight exons and spans a 35-kb genomic DNA region. The provirus integrates reproducibly in the last intron and in the same transcriptional orientation as the Tpl-2 gene. This genetic change leads to the expression of enhanced steady-state levels of a truncated Tpl-2 RNA transcript which is predicted to encode a protein with an altered C-terminal domain. Tpl-2 is transcribed from two alternating promoters, P1 and P2. The RNA transcripts originating in the two promoters harbor different 5' untranslated regions derived from the alternate noncoding exons IA and IB. Utilization of the P2 promoter, which gives rise to exon IB containing Tpl-2 RNA transcripts, was detected primarily in tumor cells. The Tpl-2 protein was expressed in COS-1 cells as an N-terminal fusion with a 12-amino-acid hemagglutinin tag. Immunoprecipitation of transfected COS-1 cell lysates with antihemagglutinin or anti-Tpl-2 antibodies, followed by incubation with [gamma-32P]ATP, confirmed that Tpl-2 possesses protein kinase activity.
Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.
A
A
Makris
C
C
Patriotis
S E
SE
Bear
P N
PN
Tsichlis
D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004279:DNA, Viral / Q000235:genetics; D015967:Gene Expression Regulation, Viral; D005796:Genes; D066298:In Vitro Techniques; D007438:Introns; D016399:Lymphoma, T-Cell / Q000235:genetics* / Q000382:microbiology*; D020930:MAP Kinase Kinase Kinases; D008969:Molecular Sequence Data; D008979:Moloney murine leukemia virus / Q000235:genetics*; D009838:Oligodeoxyribonucleotides / Q000737:chemistry; D011401:Promoter Regions, Genetic; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D014158:Transcription, Genetic; D016662:Virus Integration
D004279:DNA, Viral; D009838:Oligodeoxyribonucleotides; D011518:Proto-Oncogene Proteins; D012333:RNA, Messenger; D017346:Protein Serine-Threonine Kinases; D020930:MAP Kinase Kinase Kinases; C080356:Map3k8 protein, rat