title: Molecular cloning and expression of a human B-cell growth factor gene in Escherichia coli.
abstract: A human B-cell growth factor (BCGF) (12 kilodaltons) supports the clonal proliferation of B lymphocytes. A clone was isolated that contained the proper structural sequence to encode biologically active, 12-kilodalton BCGF in Escherichia coli and to hybridize to a specific messenger RNA, identified by in vitro translation in Xenopus laevis oocytes. A relatively hydrophobic region of 18 amino acids was found at the amino terminal of the 124-amino acid-long polypeptide. The carboxyl terminal is composed of at least 32 amino acids that are derived from nucleotide sequences bearing significant homology to the Alu repeat family.
mesh_terms: D000595:Amino Acid Sequence; D001402:B-Lymphocytes / Q000502:physiology*; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004926:Escherichia coli; D005786:Gene Expression Regulation; D006133:Growth Substances / Q000235:genetics*; D015847:Interleukin-4; D008222:Lymphokines / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: D006133:Growth Substances; D008222:Lymphokines; D015847:Interleukin-4; D004247:DNA