数字农科院2.0

Cloning and characterization of a gene encoding cysteine proteases from senescent leaves of Gossypium hirsutum

文献类型： 外文期刊

作者： Yu, SX;Han, XL;Fan, SL

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关键词： cotton;senescence;cysteine protease;programmed cell death

期刊名称： CHINESE SCIENCE BULLETIN

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收录情况： SCI

摘要： A gene encoding a cysteine proteinase was isolated from senescent leave of cotton (Gossypium hirsutum) cv liaomian No. 9 by utilizing rapid amplification of cDNA ends polymerase chain reaction (RACE-PCR), and a set of consensus oligonudeotide primers was designed to anneal the conserved sequences of plant cysteine protease genes. The cDNA, which designated Ghcysp gene, contained 1368 bp terminating in a poly(A)+ trail, and included a putative 5 (98 bp) and a 3'(235 bp) non-coding region. The opening reading frame (ORF) encodes polypeptide 344 amino acids with the predicted molecular mass of 37.88 kD and theoretical pi of 4.80. A comparison of the deduced amino acid sequence with the sequence in the GenBank database has shown considerable sequence similarity to a novel family of plant cysteine proteases. This putative cotton Ghcysp protein shows from 67 percent to 82 percent identity to the other plants. All of them share catalytic triad of residues, which are highly conserved in three regions. Hydropaths analysis of the amino acid sequence shows that the Ghcysp is a potential membrane protein and localizes to the vacuole, which has a transmembrane helix between resides 7-25. A characteristic feature of Ghcysp is the presence of a putative vacuole-targeting signal peptide of 19-amino acid residues at the N-terminal region. The expression of Ghcysp gene was determined using northern blot analysis. The Ghcysp mRNA levels are high in development senescent leaf but below the limit of detection in senescent root, hypocotyl, faded flower, 6 d post anthesis ovule, and young leaf.

分类号： N1

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