title: Molecular cloning and characterization of a cDNA encoding alpha-glucosidase from spinach.
abstract: A cDNA encoding spinach alpha-glucosidase was cloned and sequenced by the reverse-transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) methods. The cDNA comprised 2867 bp, and included an open reading frame which encodes a polypeptide of 903 amino acid residues. The calculated molecular mass of 101 kDa was larger than those of native alpha-glucosidases in spinach seeds, which are 78, 78, 82, and 82 kDa by SDS-PAGE for alpha-glucosidase I, II, III, and IV, respectively. The deduced amino acid sequence included those of tryptic peptides from native enzymes. Southern blot analysis suggested that the alpha-glucosidase gene was a single-copy gene. These results indicate the possibility that the multiplicity of alpha-glucosidase in spinach occurs via post-translational modification.
authors.affiliation: Research Institute for Bioresources, Okayama University, Kurashiki, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sugimoto
authors.forename: S
authors.initials: S
authors.lastname: Furui
authors.forename: Y
authors.initials: Y
authors.lastname: Suzuki
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics; D018749:RNA, Plant / Q000235:genetics; D012639:Seeds / Q000201:enzymology / Q000235:genetics*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D018724:Spinacia oleracea / Q000201:enzymology / Q000235:genetics*; D000520:alpha-Glucosidases / Q000235:genetics*
chemical_list: D012333:RNA, Messenger; D018749:RNA, Plant; D000520:alpha-Glucosidases