title: Isolation, expression and characterization of a human apolipoprotein B 100-specific cDNA clone.
abstract: The isolation and characterization of a human apolipoprotein B 100-specific cDNA clone (lambda gt-B1) containing a 1321 base pairs (bp) spanning insert is described. It encodes the 3'-nontranslated 281 bp long region up to the polyadenylation site and 1040 bp of the C-terminal coding region of 345 amino-acid residues of human apo B 100 and the stop codon. The lambda gt-B1 cDNA clone has been isolated from a human hepatoma cDNA expression library by immunoscreening using affinity-purified polyclonal anti apo B 100 antibodies. The nucleotide sequence of the apo B 100 insert has been determined. A part of the polypeptide sequence derived from this nucleotide sequence was identical with the amino-acid sequence obtained by protein sequencing of a purified cyanogen bromide fragment of apo B 100. The fusion protein consisting of beta-galactosidase and the 345 amino-acid residue long C-terminus of apo B 100 had an apparent molecular mass of 148 kDa in NaDodSO4 polyacrylamide gel electrophoresis. In Northern blot hybridization analysis the insert of the apo B 100-cDNA clone hybridized to a 20 to 22 kb mRNA from adult human liver.
mesh_terms: D000595:Amino Acid Sequence; D053299:Apolipoprotein B-100; D001055:Apolipoproteins B / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics* / Q000302:isolation & purification; D004262:DNA Restriction Enzymes; D006801:Humans
chemical_list: D053299:Apolipoprotein B-100; D001055:Apolipoproteins B; D004247:DNA; D004262:DNA Restriction Enzymes