title: cDNA cloning and expression analysis of a mannose-binding lectin from Pinellia pedatisecta.
abstract: Pinellia pedatisecta agglutinin (PPA)is a very basic protein that accumulates in the tuber of P.pedatisecta .PPA is a hetero-tetramer protein of 40 kDa,composed of two polypeptide chains A (about 12 kDa)and two polypeptides chains B (about 12 kDa).The full-length cDNA of PPA was cloned from P.pedatisecta using SMART RACE-PCR technology; it was 1146 bp and contained a 771 bp open reading frame (ORF)encoding a lectin precursor of 256 amino acid residues with a 24 amino acid signal peptide.The PPA precursor contained 3 mannose-binding sites (QXDXNXVXY) and two conserved domains of 43% identity,PPA-DOM 1 (polypeptides A)and PPA-DOM 2 (polypeptides B).PPA shared varying identities,ranging from 40% to 85%,with mannose-binding lectins from other species of plant families such as Araceae, Alliaceae, Iridaceae, Liliaceae, Amaryllidaceae and Bromeliaceae. Southern blot analysis indicated that ppa belonged to a multi-copy gene family. Expression pattern analysis revealed that ppa expressed in most tested tissues, with high expression being found in spadix,spathe and tuber.Cloning of the ppa gene not only provides a basis for further investigation of its structure,expression and regulatory mechanism,but also enables us to test its potential role in controlling pests and fungal diseases by transferring the gene into plants in the future.
authors: State Key Laboratory of Genetic Engineering, Fudan-SJTU-Nottingham Plant Biotechnology R and D Center, School of Life Sciences, Morgan-Tan International Center for Life Sciences, Fudan University, Shanghai 200433, People's Republic of China.
authors: Juan
authors: J
authors: Lin
authors: Xuanwei
authors: X
authors: Zhou
authors: Shi
authors: S
authors: Gao
authors: Xiaojun
authors: X
authors: Liu
authors: Weisheng
authors: W
authors: Wu
authors: Xiaofen
authors: X
authors: Sun
authors: Kexuan
authors: K
authors: Tang
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D003001:Cloning, Molecular; D016000:Cluster Analysis; D019295:Computational Biology; D018076:DNA, Complementary / Q000235:genetics; D015870:Gene Expression; D037601:Mannose-Binding Lectin / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D030021:Pinellia / Q000235:genetics*; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D018076:DNA, Complementary; D037601:Mannose-Binding Lectin