title: Affinity purification and cDNA cloning of rat neural differentiation and tumor cell surface antigen gp130RB13-6 reveals relationship to human and murine PC-1.
abstract: Monoclonal antibody RB13-6 recognizes a subset of rat brain glial precursor cells that are highly susceptible to malignant conversion by the carcinogen N-ethyl-N-nitrosourea. The corresponding cell surface antigen was identified as a membrane glycoprotein (gp130RB13-6) and purified by immunoaffinity chromatography from the tumorigenic neuroectodermal rat cell line BT4Ca. Sequencing of 5 endoproteinase-generated peptides of the purified antigen permitted the specific amplification of a cDNA fragment by reverse transcription-polymerase chain reaction and subsequent isolation of the complete coding sequence from a fetal rat brain cDNA library. The derived amino acid sequence indicates that the RB13-6 antigen is related to the human and murine plasma cell membrane protein PC-1, a nucleotide pyrophosphatase/alkaline phosphodiesterase and ectoprotein kinase. Similarly, purified gp130RB13-6 possesses 5'-nucleotidase activity that can be inhibited with EDTA. Different from PC-1, gp130RB13-6 isolated from BT4Ca cells is not a disulfide-linked dimer and contains an RGD-tripeptide sequence which, together with other structural features, suggests a possible function in cell adhesion and its subversion in malignant phenotypes.
authors.affiliation: Institute of Cell Biology (Cancer Research), University of Essen Medical School, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Deissler
authors.forename: F
authors.initials: F
authors.lastname: Lottspeich
authors.forename: M F
authors.initials: MF
authors.lastname: Rajewsky
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000944:Antigens, Differentiation, B-Lymphocyte / Q000235:genetics*; D001483:Base Sequence; D002460:Cell Line; D002846:Chromatography, Affinity / Q000379:methods; D003001:Cloning, Molecular; D017931:DNA Primers; D018076:DNA, Complementary; D006801:Humans; D051907:Lysosomal Membrane Proteins; D008562:Membrane Glycoproteins / Q000235:genetics* / Q000302:isolation & purification; D051379:Mice; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000235:genetics* / Q000302:isolation & purification; D051381:Rats; D017386:Sequence Homology, Amino Acid; D052118:Lysosomal-Associated Membrane Protein 1
chemical_list: D000944:Antigens, Differentiation, B-Lymphocyte; D017931:DNA Primers; D018076:DNA, Complementary; D051907:Lysosomal Membrane Proteins; D008562:Membrane Glycoproteins; D009363:Neoplasm Proteins; C489116:LAMP1 protein, human; D052118:Lysosomal-Associated Membrane Protein 1; C052255:Lamp1 protein, mouse; C489117:Lamp1 protein, rat