Molecular cloning and functional analysis of a novel type of Bowman-Birk inhibitor gene family in rice

文献类型： 外文期刊

第一作者： Qu, LJ

作者： Qu, LJ;Chen, J;Liu, MH;Pan, NS;Okamoto, H;Lin, ZZ;Li, CY;Li, DH;Wang, JL;Zhu, GF;Zhao, X;Chen, X;Gu, HG;Chen, ZL

作者机构：

关键词： Amino-acid-sequence;Proteinase-inhibitor;Trypsin-inhibitor;Protease;inhibitor;Crystal-structure;Alfalfa leaves;Draft sequence;Potato-tubers;Plants;Seeds

期刊名称：PLANT PHYSIOLOGY （ 影响因子：8.34； 五年影响因子：8.972 ）

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收录情况： SCI

摘要： Bowman-Birk inhibitor (BBI) genes encode serine protease inhibitors that have repetitive cysteine-rich domains with reactive sites for the trypsin or chymotrypsin family. We have identified seven BBI genes from japonica rice (Oryza sativa subsp. japonica var Teqing). All of the genes identified were found in a single cluster on the southern end of the long arm of rice chromosome 1. Four of the seven BBI genes have two repetitive cysteine-rich domains, whereas one has a truncated domain with only one reactive site. We have also identified three novel BBI genes, each of which possesses three repetitive domains instead of two. In situ hybridization analyses indicated that the accumulation of rice BBI transcripts was differentially regulated in germinating embryos and also in the leaves, roots, and flower organs at later developmental stages. Different members of the rice BBI gene family displayed different expression patterns during rice seed germination, and wounding induced the expression of rice BBI transcripts. The three-domain BBIs had higher expression levels than the two-domain BBIs. It was also found that the mRNA of rice BBI genes was present in abundant amounts in scutellar epithelium and aleurone layer cells. RBBI3-1 one of the three-domain RBBI, exhibited in vitro trypsin-inhibiting activity but no chymotrypsin-inhibiting activity. Overexpression of RBBI2-3 in transgenic rice plants resulted in resistance to the fungal pathogen Pyricularia oryzae, indicating that proteinase inhibitors confer resistance against the fungal pathogen in vivo and that they might play a role in the defense system of the rice plant.

分类号： Q945

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