Yongquan Lu

Fudan University, Shanghai, Shanghai Shi, China

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Publications (3)6.57 Total impact

  • [Show abstract] [Hide abstract] ABSTRACT: 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.
    No preview · Article · Sep 2003 · Journal of Plant Physiology
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    [Show abstract] [Hide abstract] ABSTRACT: It has been established that changes in gene expression occur during cold acclimation in a wide range of plants. Here we present a novel cDNA encoding a protein with a calculated molecular mass of 25 kDa, designated cor25, from Brassica pekinensis cv. Zaoshu 5 (Chinese cabbage) that was similar with a cold-regulated Arabidopsis thaliana L. gene, cor47. Protein sequence alignment showed that COR25 had 53.5% of identity with COR47 and 59.6% of identity with ERD10, an Arabidopsis thaliana L. early-responsive gene to dehydration stress. Northern blot analysis revealed that the cor25 expression was cold inducible. Moreover, the transcripts of the cor25 accumulated in plants in response to exogenous application of ABA and water stress. The possible functions of the cold-regulated gene and the mechanism for plants to cope with low temperature are discussed.
    Full-text · Article · Jul 2003 · DNA Sequence
  • [Show abstract] [Hide abstract] ABSTRACT: A new lectin gene was cloned from Arisaema heterophyllum. The full-length cDNA of Arisaema heterophyllum agglutinin (AHA) was 1169 bp and contained a 777 bp open reading frame encoding a 258 amino acid protein. Homology analysis showed that AHA had high homology with many other mannose-binding lectins. Secondary and three-dimensional analyses showed that AHA had many common characters of mannose-binding lectin superfamily. Southern blot analysis of the genomic DNA revealed that aha belonged to a multigene family. Northern blot analysis demonstrated that aha constitutively expressed in various plant tissues including inflorescence, leaf and tuber, and highly expressed in the tuber.
    No preview · Article · Jul 2003 · Plant Science