title: Cloning and characterization of the gene encoding mouse IkappaBbeta.
abstract: IkappaBbeta is a member of the IkappaB family of structurally related proteins that are important regulators of the inducible transcription factor NF-kappaB. In the present study, the mouse IkappaBbeta gene was cloned and sequenced, and its structure determined. The mouse IkappaBbeta gene contains six exons and five introns that span 7435 nucleotides. A single major transcription initiation site is located 59 nucleotides upstream of the initiating methionine. A translation termination codon and a single polyadenylation signal are found within exon 6. The exon/intron structure of IkappaBbeta and IkappaBalpha genes were compared and found to be very similar, with individual ankyrin repeats being maintained on corresponding exons. This suggests a close evolutionary relationship between these two IkappaB isoforms. The significance of this evolutionary relationship is discussed.
authors.affiliation: Section of Immunobiology and Department of Molecular Biophysics and Biochemistry, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06520, USA.
authors.forename: L M
authors.initials: LM
authors.lastname: Budde
authors.forename: S
authors.initials: S
authors.lastname: Ghosh
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000737:chemistry / Q000235:genetics; D005091:Exons; D005796:Genes / Q000235:genetics*; D020672:I-kappa B Proteins / Q000235:genetics*; D007438:Introns; D051379:Mice; D008815:Mice, Inbred Strains; D008969:Molecular Sequence Data; D020033:Protein Isoforms / Q000235:genetics; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: D020672:I-kappa B Proteins; D020033:Protein Isoforms; D004247:DNA