title: Human U1 snRNP-specific C protein: complete cDNA and protein sequence and identification of a multigene family in mammals.
abstract: A complementary DNA clone for the human U1 snRNP-specific C protein has been isolated. The nucleotide sequence of the 733 bp cDNA insert includes a 15 bp 5'-untranslated region, an open reading frame of 477 bp corresponding to 159 amino acids (Mr = 17,373 D), and a 223 bp 3'-untranslated region. The identity of the clone was confirmed by in vitro translation of hybrid-selected mRNA or an RNA transcript synthesized from the cDNA. The in vitro synthesized C protein has a slightly greater mobility on SDS-polyacrylamide gels, indicating that the in vivo product is post-translationally modified. The deduced primary structure contains a segment of high proline and methionine content. A region homologous to the RNP consensus sequence, found in the other two U1 snRNP-specific proteins 70K and A, is absent. Analysis of genomic DNA restriction enzyme digests shows hybridizing fragments in the genome of all vertebrate classes. The results are consistent with multi-copy representation of the C protein gene in mammals, whereas in the other vertebrate classes the related protein seems to be encoded by a single-copy gene.
authors.affiliation: Department of Biochemistry, University of Nijmegen, The Netherlands.
authors.forename: P T
authors.initials: PT
authors.lastname: Sillekens
authors.forename: R P
authors.initials: RP
authors.lastname: Beijer
authors.forename: W J
authors.initials: WJ
authors.lastname: Habets
authors.forename: W J
authors.initials: WJ
authors.lastname: van Venrooij
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D004247:DNA / Q000235:genetics; D005796:Genes; D006367:HeLa Cells / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000235:genetics; D012156:Reticulocytes / Q000378:metabolism; D012261:Ribonucleoproteins / Q000378:metabolism*; D017411:Ribonucleoproteins, Small Nuclear; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; D012261:Ribonucleoproteins; D017411:Ribonucleoproteins, Small Nuclear; D004247:DNA