title: Cloning and characterisation of Ifi206: a new murine HIN-200 family member.
abstract: HIN-200 proteins are interferon-inducible proteins capable of regulating cell growth, senescence, differentiation and death. Using a combination of in silico analysis of NCBI EST databases and screening of murine C57BL/6 cDNA libraries we isolated novel murine HIN-200 cDNAs designated Ifi206S and Ifi206L encoding two putative mRNA splice variants. The p206S and p206L protein isoforms have a modular domain structure consisting of an N-terminal PAAD/DAPIN/Pyrin domain, a region rich in serine, threonine and proline residues and a C-terminal 200 B domain characteristic of other HIN-200 proteins. Ifi206 mRNA was detected only in the spleen and lung of BALB/c and C57BL/6 mice and expression was up-regulated by both types I and II IFN subtypes. p206 protein was predominantly expressed in the cytoplasm and addition of LMB, a CRM1 dependent nuclear export inhibitor, caused p206 to accumulate in the nucleus. Unlike other human and mouse HIN-200 proteins that contain only a single 200 amino acid domain, overexpression of p206 impaired the clonogenic growth of tumour cell lines. Thus, p206 represents the newest HIN-200 family member discovered. It has distinct and restricted pattern of expression however maintains many of the hallmarks of HIN-200 proteins including the presence of a characteristic 200 X domain, induction by interferon and an ability to suppress tumour cell growth.
authors.affiliation: Cancer Immunology Program, Peter MacCallum Cancer Centre, St Andrews Place, East Melbourne, Victoria, Australia.
authors.forename: Louise E
authors.initials: LE
authors.lastname: Ludlow
authors.forename: Linda L
authors.initials: LL
authors.lastname: Hii
authors.forename: Janine
authors.initials: J
authors.lastname: Thorpe
authors.forename: Andrea
authors.initials: A
authors.lastname: Newbold
authors.forename: Kellie M
authors.initials: KM
authors.lastname: Tainton
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Trapani
authors.forename: Christopher J P
authors.initials: CJ
authors.lastname: Clarke
authors.forename: Ricky W
authors.initials: RW
authors.lastname: Johnstone
mesh_terms: D016475:3T3 Cells; D017398:Alternative Splicing; D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D003001:Cloning, Molecular; D003593:Cytoplasm / Q000378:metabolism; D015723:Gene Library; D007370:Interferon Type I / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D009928:Organ Specificity; D011487:Protein Conformation; D012333:RNA, Messenger / Q000378:metabolism; D011994:Recombinant Proteins; D014162:Transfection; D025521:Tumor Suppressor Proteins / Q000235:genetics / Q000378:metabolism*