title: Cloning and characterization of a novel trypsin inhibitor (BTIomega1) gene from Fagopyrum esculentum.
abstract: Based on the amino acid information of trypsin inhibitor of buckwheat (Fagopyrum Esculentum Moench), degenerated primers were designed and a full-length cDNA sequence named BTIomega1 (Buckwheat Trypsin Inhibitor) was amplified from the leaves RNA by using RT-PCR and rapid amplification of cDNA ends (RACE) methods. Sequence analysis shows that the 392 bp cDNA contained an open reading frame (ORF) of 216 bp, encoding 72 amino acids residues. The deduced amino acid sequence exhibits 96 and 93% homology with BWI-1 and BTI-2, a natural trypsin inhibitor from buckwheat seeds. Southern blotting suggested that three copies of BTIomega1 gene existed in the buckwheat genome. Moreover, a predicted secondary structure and 3D-structural model was constructed by homology modeling. To our knowledge, this is the first all-round report of the gene BTIomega1. The novel BTIomega1 gene has been submitted to the GeneBank under Accession No. DQ289792.
authors.affiliation: Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Biotechnology, Shanxi University, Taiyuan 030006, People's Republic of China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Li
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhang
authors.forename: Aihua
authors.initials: A
authors.lastname: Liang
authors.forename: Zhuanhua
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D019612:Fagopyrum / Q000235:genetics*; D008957:Models, Genetic; D008969:Molecular Sequence Data; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics*; D017433:Protein Structure, Secondary; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017385:Sequence Homology; D014361:Trypsin Inhibitors / Q000235:genetics*
chemical_list: D018076:DNA, Complementary; D010940:Plant Proteins; D014361:Trypsin Inhibitors