title: Sequence, genomic organization, and chromosomal localization of the human LPAP (PTPRCAP) and mouse CD45-AP/LSM-1 genes.
abstract: Human LPAP (lymphocyte phosphatase associated phosphoprotein) and its mouse homologue, CD45-AP (CD45 associated protein) or LSM-1, represent 32- and 30-kDa transmembrane phosphoproteins that noncovalently associate with the tyrosine phosphatase CD45, a key molecule involved in T- and B-lymphocyte activation. Here we report the isolation and sequencing of genomic clones of the human and mouse genes. LPAP (HGMW-approved symbol PTPRCAP) maps to human chromosome 11q13, distal to the BCL-1 breakpoint, and mouse CD45-AP/LSM-1 maps to Chromosome 19B. Both genes span 3 kb and consist of two exons that are separated by a 1.2-kb intron. The promoter regions do not contain TATA boxes, but possess consensus transcriptional initiator sequences that have also been described for other TATA-less genes. The genomic sequences also provide a genetic basis for two different cDNAs (termed CD45-AP and LSM-1, respectively) that have been described in the mouse system.
authors.affiliation: Institute of Immunology, Ruprecht-Karls-Universität, Heidelberg, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Bruyns
authors.forename: A
authors.initials: A
authors.lastname: Mincheva
authors.forename: R M
authors.initials: RM
authors.lastname: Bruyns
authors.forename: H
authors.initials: H
authors.lastname: Kirchgessner
authors.forename: S
authors.initials: S
authors.lastname: Weitz
authors.forename: P
authors.initials: P
authors.lastname: Lichter
authors.forename: S
authors.initials: S
authors.lastname: Meuer
authors.forename: B
authors.initials: B
authors.lastname: Schraven
mesh_terms: D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping; D002880:Chromosomes, Human, Pair 11; D018076:DNA, Complementary; D005091:Exons; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D047908:Intracellular Signaling Peptides and Proteins; D007438:Introns; D008565:Membrane Proteins / Q000235:genetics*; D051379:Mice; D008969:Molecular Sequence Data; D010750:Phosphoproteins / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid
chemical_list: D018076:DNA, Complementary; D047908:Intracellular Signaling Peptides and Proteins; D008565:Membrane Proteins; C090519:PTPRCAP protein, human; D010750:Phosphoproteins; C513303:Ptprcap protein, mouse