title: Molecular cloning of preprocathepsin E cDNA from the stomach of bullfrog Rana catesbeiana.
abstract: A cDNA library was constructed from a poly(A)(+) RNA fraction of the gastric mucosa of bullfrog Rana catesbeiana. We cloned a cDNA encoding preprocathepsin E (Pre-Pro-CE) from the library. The present study is the first demonstration of the Pre-Pro-CE cDNA of lower vertebrate such as amphibian. Amino acid sequence deduced from the cDNA was compared with partial amino acid sequence determined by Edman degradation, suggesting that the cDNA comprises an open reading frame encoding a signal peptide (16 amino acids), a pro-sequence (33 amino acids) and a mature protein region (348 amino acids). Two consensus tri-peptide sequences (FDT and VDT) as active site and positions of seven cysteine residues were conserved in this amphibian CE. Although the bullfrog CE was deduced to contain one potential N-linked glycosylation site, its position (Asn(139)-Leu(140)-Thr(141)) was different from that of mammalian CEs. Molecular phylogenetic analysis showed that the bullfrog Pro-CE belongs to the typical Pro-CE group among various aspartic proteinases.
authors.affiliation: Department of Biology, Faculty of Education, Utsunomiya University, 350 Mine, Utsunomiya 321-8505, Japan. inokuchi@utsunomiya-u.ac.jp
authors.forename: Tomofumi
authors.initials: T
authors.lastname: Inokuchi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Ikuzawa
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Mineta
authors.forename: Shigeki
authors.initials: S
authors.lastname: Yasumasu
authors.forename: Ken-ichiro
authors.initials: K
authors.lastname: Kobayashi
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D020059:Cathepsin E / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D003001:Cloning, Molecular; D005753:Gastric Mucosa / Q000502:physiology*; D006801:Humans; D008969:Molecular Sequence Data; D010802:Phylogeny; D011498:Protein Precursors / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D011892:Rana catesbeiana / Q000033:anatomy & histology* / Q000378:metabolism*; D016415:Sequence Alignment
chemical_list: D011498:Protein Precursors; D020059:Cathepsin E