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J Plant Physiol ; 160(8): 913-20, 2003 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12964867

RESUMO

Full-length cDNA of a mannose-binding lectin or agglutinin gene was cloned from a traditional Chinese medicinal herb Crinum asiaticum var. sinicum through RACE-PCR cloning. The full-length cDNA of C. asiaticum agglutinin (caa) was 820 bp and contained a 528 bp open reading frame encoding a lectin precursor (preproprotein) of 175 amino acid residues with a 22 aa signal peptide. The coding region of the caa gene was high in G/C content. The first 20 bp of the 5' UTR had a dC content of 50%, which was a typical feature of the leader sequence. By cutting away the signal peptide, the CAA proprotein was 15.79 kDa with a pl of 9.27 and contained 3 mannose-binding sites (QDNY). Random coil and extended strand constituted interlaced domination of the main part of the secondary structure. B-lectin conserved domain existed within N24 to G130. Predicted three-dimensional structure of CAA proprotein was very similar to that of GNA (Galanthus nivalis agglutinin). It is significant that besides certain homologies to known monocot mannose-binding lectins from Amaryllidaceae, Orchidaceae, Alliaceae and Liliaceae, caa also showed high similarity to gastrodianin type antifungal proteins. No intron was detected within the region of genomic sequence corresponding to the caa full-length cDNA. Southern blot analysis indicated that the caa gene belonged to a low-copy gene family. Northern blot analysis demonstrated that caa mRNA was constitutively expressed in all the tested tissue types including the root, bulb, leaf, rachise, flower and fruit tissues.


Assuntos
Crinum/genética , Lectina de Ligação a Manose/química , Lectina de Ligação a Manose/genética , Sequência de Aminoácidos , Sequência de Bases , Clonagem Molecular , Primers do DNA , DNA Complementar/química , DNA Complementar/genética , Modelos Moleculares , Dados de Sequência Molecular , Conformação Proteica , Alinhamento de Sequência , Homologia de Sequência de Aminoácidos
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