title: Molecular characterization of a protein-tyrosine-phosphatase enriched in striatum.
abstract: A cDNA clone encoding a neural-specific putative protein-tyrosine-phosphatase (protein-tyrosine-phosphate phosphohydrolase, EC 3.1.3.48) has been isolated from a rat striatal cDNA library. The deduced amino acid sequence predicts a protein of approximately 369 amino acids with a strong homology to other members of the family of protein-tyrosine-phosphatases. In vitro translation produces a protein with an apparent molecular mass of 46 kDa. A potential attachment mechanism to the cytoplasmic membrane is suggested by a myristoylation amino acid-consensus sequence at the N terminus of the protein. RNA analyses of various regions of rat brain reveal a 3-kilobase (kb) and a 4.4-kb mRNA. The 3-kb mRNA is highly enriched within the striatum relative to other brain areas and has been termed a "striatum enriched phosphatase" (STEP). In contrast, the 4.4-kb message is most abundant in the cerebral cortex and rare in the striatum. These two messages appear to be alternatively processed RNA transcripts of a single gene.
authors.affiliation: Child Study Center, Yale University School of Medicine, New Haven, CT 06510.
authors.forename: P J
authors.initials: PJ
authors.lastname: Lombroso
authors.forename: G
authors.initials: G
authors.lastname: Murdoch
authors.forename: M
authors.initials: M
authors.lastname: Lerner
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001921:Brain / Q000201:enzymology; D002417:Cattle; D003001:Cloning, Molecular; D003342:Corpus Striatum / Q000201:enzymology*; D004247:DNA / Q000235:genetics / Q000302:isolation & purification; D015723:Gene Library; D008969:Molecular Sequence Data; D010749:Phosphoprotein Phosphatases / Q000235:genetics*; D014176:Protein Biosynthesis; D017027:Protein Tyrosine Phosphatases; D011699:Putamen / Q000201:enzymology; D012313:RNA / Q000235:genetics / Q000302:isolation & purification; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D015183:Restriction Mapping; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; D012313:RNA; D004247:DNA; D010749:Phosphoprotein Phosphatases; D017027:Protein Tyrosine Phosphatases