title: Molecular cloning of Phaseolus vulgaris lectin mRNA and use of cDNA as a probe to estimate lectin transcript levels in various tissues.
abstract: The complete amino acid sequence of a Phaseolus vulgaris cv. Tendergreen lectin was deduced from the nucleotide sequence of a cDNA plasmid. The lectin appears to be synthesized as a prepeptide consisting of a signal sequence of at least 20 residues and a mature protein of 223 amino acids. The 5' region of the lectin cDNA contains four AUG codons, one of which may initiate a 58 amino acid peptide out of phase with lectin translation. Lectin transcripts 1.1 kb long begin accumulating in cotyledons by the 9 mm stage, increasing in amount until about the 16 mm stage, after which their levels dramatically decrease. In addition, larger lectin-specific transcripts are detected in mid-maturation phase cotyledons. A 1.1 kb RNA species in leaves from plants filling their pods hybridizes with lectin cDNA, but no hybridizing RNA is found in primary leaves or roots.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000378:metabolism*; D010835:Phytohemagglutinins; D037121:Plant Lectins; D010944:Plants / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics* / Q000302:isolation & purification; D014158:Transcription, Genetic
chemical_list: D010835:Phytohemagglutinins; D037121:Plant Lectins; D012333:RNA, Messenger; D004247:DNA