Jujube witches’broom(JWB)phytoplasmas parasitize the sieve tubes of diseased phloem and cause an excessive proliferation of axillary shoots from dormant lateral buds to favour their transmission.In previous research,...Jujube witches’broom(JWB)phytoplasmas parasitize the sieve tubes of diseased phloem and cause an excessive proliferation of axillary shoots from dormant lateral buds to favour their transmission.In previous research,two JWB effectors,SJP1 and SJP2,were identified to induce lateral bud outgrowth by disrupting ZjBRC1-mediated auxin flux.However,the pathogenesis of JWB disease remains largely unknown.Here,tissue-specific transcriptional reprogramming was examined to gain insight into the genetic mechanisms acting inside jujube lateral buds under JWB phytoplasma infection.JWB phytoplasmas modulated a series of plant signalling networks involved in lateral bud development and defence,including auxin,abscisic acid(ABA),ethylene,jasmonic acid,and salicylic acid.JWB-induced bud outgrowth was accompanied by downregulation of ABA synthesis within lateral buds.ABA application rescued the bushy appearances of transgenic Arabidopsis overexpressing SJP1 and SJP2 in Col-0 and ZjBRC1 in the brc1-2 mutant.Furthermore,the expression of ZjBRC1 and ABA-related genes ZjHB40 and ZjNCED3 was negatively correlated with lateral main bud outgrowth in decapitated healthy jujube.Molecular evidence showed that ZjBRC1 interacted with ZjBRC2 via its N-terminus to activate ZjHB40 and ZjNCED3 expression and ABA accumulation in transgenic jujube calli.In addition,ZjBRC1 widely regulated differentially expressed genes related to ABA homeostasis and ABA signalling,especially by binding to and suppressing ABA receptors.Therefore,these results suggest that JWB phytoplasmas hijack the ZjBRC1-mediated ABA pathways to stimulate lateral bud outgrowth and expansion,providing a strategy to engineer plants resistant to JWB phytoplasma disease and regulate woody plant architecture to promote crop yield and quality.展开更多
研究使用ZDOCK算法进行HsRAD51蛋白与多肽BRC4分子对接的准确性.采用Accelrys Discovery Studio 3.5软件计算平台,使用基于快速傅立叶转换的ZDOCK分子对接程序进行蛋白HsRAD51与乳腺易感基因BRCA2的重复基元BRC4的分子对接,然后使用RDOC...研究使用ZDOCK算法进行HsRAD51蛋白与多肽BRC4分子对接的准确性.采用Accelrys Discovery Studio 3.5软件计算平台,使用基于快速傅立叶转换的ZDOCK分子对接程序进行蛋白HsRAD51与乳腺易感基因BRCA2的重复基元BRC4的分子对接,然后使用RDOCK程序进行结果优化,最后将通过分子对接得到的几个蛋白-多肽复合物的三级结构与文献报道的通过X射线测得的蛋白HsRAD51与BRC4复合物的准确结构进行叠合比较,结果发现其中一些结构的叠合效果较好,碳链骨架叠合的RMSD最小的为0.034 4nm.推测使用ZDOCK分子对接程序来进行HsRAD51蛋白与多肽的对接,具有较高的准确性.该结果为今后研究HsRAD51蛋白与BRCA2其他重复基元的分子对接以及相互作用提供了重要依据.展开更多
基金supported by the National Natural Science Foundation of China(31971687 and 32002007)the Anhui Province Key Research and Development Program(202004a06020008)+1 种基金the Natural Science Foundation of Anhui Province(2008085QC127)the Natural Science Foundation of Anhui Provincial Department of Education(KJ2019A0186).
文摘Jujube witches’broom(JWB)phytoplasmas parasitize the sieve tubes of diseased phloem and cause an excessive proliferation of axillary shoots from dormant lateral buds to favour their transmission.In previous research,two JWB effectors,SJP1 and SJP2,were identified to induce lateral bud outgrowth by disrupting ZjBRC1-mediated auxin flux.However,the pathogenesis of JWB disease remains largely unknown.Here,tissue-specific transcriptional reprogramming was examined to gain insight into the genetic mechanisms acting inside jujube lateral buds under JWB phytoplasma infection.JWB phytoplasmas modulated a series of plant signalling networks involved in lateral bud development and defence,including auxin,abscisic acid(ABA),ethylene,jasmonic acid,and salicylic acid.JWB-induced bud outgrowth was accompanied by downregulation of ABA synthesis within lateral buds.ABA application rescued the bushy appearances of transgenic Arabidopsis overexpressing SJP1 and SJP2 in Col-0 and ZjBRC1 in the brc1-2 mutant.Furthermore,the expression of ZjBRC1 and ABA-related genes ZjHB40 and ZjNCED3 was negatively correlated with lateral main bud outgrowth in decapitated healthy jujube.Molecular evidence showed that ZjBRC1 interacted with ZjBRC2 via its N-terminus to activate ZjHB40 and ZjNCED3 expression and ABA accumulation in transgenic jujube calli.In addition,ZjBRC1 widely regulated differentially expressed genes related to ABA homeostasis and ABA signalling,especially by binding to and suppressing ABA receptors.Therefore,these results suggest that JWB phytoplasmas hijack the ZjBRC1-mediated ABA pathways to stimulate lateral bud outgrowth and expansion,providing a strategy to engineer plants resistant to JWB phytoplasma disease and regulate woody plant architecture to promote crop yield and quality.
文摘研究使用ZDOCK算法进行HsRAD51蛋白与多肽BRC4分子对接的准确性.采用Accelrys Discovery Studio 3.5软件计算平台,使用基于快速傅立叶转换的ZDOCK分子对接程序进行蛋白HsRAD51与乳腺易感基因BRCA2的重复基元BRC4的分子对接,然后使用RDOCK程序进行结果优化,最后将通过分子对接得到的几个蛋白-多肽复合物的三级结构与文献报道的通过X射线测得的蛋白HsRAD51与BRC4复合物的准确结构进行叠合比较,结果发现其中一些结构的叠合效果较好,碳链骨架叠合的RMSD最小的为0.034 4nm.推测使用ZDOCK分子对接程序来进行HsRAD51蛋白与多肽的对接,具有较高的准确性.该结果为今后研究HsRAD51蛋白与BRCA2其他重复基元的分子对接以及相互作用提供了重要依据.
