title: Characterization of porcine dentin sialoprotein (DSP) and dentin sialophosphoprotein (DSPP) cDNA clones.
abstract: Dentin sialophosphoprotein (DSPP) is a chimeric glycoprotein with dentin sialoprotein (DSP) on its N-terminus and dentin phosphoprotein (DPP) on its C-terminus. We have constructed and screened a unidirectional cDNA library derived from the pulp organ of developing pig teeth, and isolated cDNA clones encoding DSP-only, as well as two DSPP clones with alternative sequences in their 3' coding regions. The DSP-only transcript has an open reading frame of 386 codons, and is generated through the use of a polyadenylation signal within intron 4, immediately following the DSP coding region. the use of this polyadenylation signal deletes the DPP coding region and places a TGA translation termination signal as the fourth codon following the exon 4-encoded segment. The DSPP cDNAs contain open reading frames of 593 and 600 codons. Northern blots hybridized to radiolabeled DSP probes showed bands at 1.4, 2.5, 4.4, and 4.8 kb. Cloning and characterization of reverse transcriptase polymerase chain reaction products confirmed the existence of mRNA encoding pDSP386, pDSPP593, and pDSPP600in vivo, but also suggested that DNA sequence redundancies in the DSPP coding region make it prone to cloning artifacts.
authors.affiliation: University of Michigan Dental Research Laboratory, Ann Arbor, MI 48108, USA.
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Yamakoshi
authors.forename: Jan C-C
authors.initials: JC
authors.lastname: Hu
authors.forename: Shengxi
authors.initials: S
authors.lastname: Liu
authors.forename: Chuhua
authors.initials: C
authors.lastname: Zhang
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Oida
authors.forename: Makoto
authors.initials: M
authors.lastname: Fukae
authors.forename: James P
authors.initials: JP
authors.lastname: Simmer
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015152:Blotting, Northern; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000032:analysis; D003804:Dentin / Q000737:chemistry*; D003810:Dentinogenesis / Q000235:genetics*; D016326:Extracellular Matrix Proteins; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D010750:Phosphoproteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics; D026723:Polyadenylation; D011498:Protein Precursors / Q000096:biosynthesis / Q000737:chemistry* / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D051381:Rats; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012795:Sialoglycoproteins / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics; D013552:Swine; D000099311:Dentin Sialophosphoprotein
chemical_list: D018076:DNA, Complementary; D016326:Extracellular Matrix Proteins; D010750:Phosphoproteins; D011498:Protein Precursors; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D012795:Sialoglycoproteins; D000099311:Dentin Sialophosphoprotein