通过生物信息学方法对长春花茉莉酸受体CrCOI1氨基酸序列、结构域以及二级、三级结构进行分析,利用分子生物学方法构建重组质粒并进行原核表达。结果显示:CrCOI1编码516个氨基酸,为胞质定位,分子量为58.26 k D,等电点pI为5.45,与番薯COI...通过生物信息学方法对长春花茉莉酸受体CrCOI1氨基酸序列、结构域以及二级、三级结构进行分析,利用分子生物学方法构建重组质粒并进行原核表达。结果显示:CrCOI1编码516个氨基酸,为胞质定位,分子量为58.26 k D,等电点pI为5.45,与番薯COI1蛋白的亲缘关系比较近,CrCOI1含有F-box结构域、多个LRR富集亮氨酸重复结构域以及转运抑制响应1结构域;该蛋白二级结构由50.97%α-螺旋、31.59%无规则卷曲、12.79%延伸链以及少部分β-转角(4.65%)组成;经SWISS-MODEL预测其三级结构显示,CrCOI1蛋白由α-螺旋和无规则卷曲组成,其中F-box的3个α-螺旋从蛋白的N端伸出便于结合配体。进一步地成功构建了重组表达质粒pET28a-CrCOI1,并经IPTG诱导后在大肠杆菌BL21中实现异源表达,且发现经16℃、0.4 mmol/L IPTG诱导至12 h后蛋白表达量最高,具有时间依赖性。上述结果表明,我们成功构建了长春花茉莉酸受体CrCOI1的重组表达质粒,实现大肠杆菌中的表达,并对其进行了序列以及结构分析。这为研究CrCOI1的功能以及通过其介导茉莉酸信号调控植物生长发育以及代谢产物合成提供一定依据。展开更多
茉莉酸是植物响应生物和非生物逆境胁迫的关键激素之一,而茉莉酸信号受体蛋白（Coronatine-insensitive protein 1, COI1）在茉莉酸信号转导过程中发挥着关键作用。本研究基于海南龙血树转录数据中的转录本序列,利用注释拼接和RT-PCR的...茉莉酸是植物响应生物和非生物逆境胁迫的关键激素之一,而茉莉酸信号受体蛋白（Coronatine-insensitive protein 1, COI1）在茉莉酸信号转导过程中发挥着关键作用。本研究基于海南龙血树转录数据中的转录本序列,利用注释拼接和RT-PCR的方法首次鉴定了1个编码海南龙血树茉莉酸受体COI1基因（命名为DcCOI1, GenBank登录号为MF193604）,DcCOI1基因长度为2 274 bp,包含一个1 785 bp的完整开放阅读框,编码594个氨基酸,Dc COI1蛋白与芦笋COI1序列的一致性为94%,系统进化分析中与芦笋、剑兰划为同一分支,同属于单子叶植物大类。生物信息学分析显示,其编码蛋白包含COI1的蛋白的F-box特征结构域,分子量为64.14 k D,理论等电点为6.09,为非分泌型蛋白,且不含跨膜结构域,包含52个磷酸化位点,主要在细胞质中发挥生理作用;二级结构主要有α螺旋（43.10%）和无规则卷曲（29.63%）构成。实时荧光定量PCR检测发现DcCOI1在海南龙血树根、茎、叶和花中均有表达,根和茎中的表达量较高,而花中的表达量最低。此结果为阐明海南龙血树血竭形成过程中茉莉酸的调控作用研究奠定了基础。展开更多
Jasmonates （JAs） are a class of plant hormones that play important roles in the regulation of plant development and plant defense. It has been shown that Arabidopsis plants produce much higher levels of anthocyanins...Jasmonates （JAs） are a class of plant hormones that play important roles in the regulation of plant development and plant defense. It has been shown that Arabidopsis plants produce much higher levels of anthocyanins when treated exogenously with methyl jasmonate （MeJA）. However, a molecular link between the JA response and anthocyanin production has not been determined. The CORONATINE INSENTITIVE1 （COI1） gene is a key player in the regulation of many JA-related responses. In the present study, we demonstrate that the COI1 gene is also required for the JA-induced accumulation of anthocyanins in Arabidopsis. Furthermore, the MeJA-inducible expression of DIHYDROFLAVONOL REDUCTASE （DFR）, an essential component in the anthocyanin biosynthesis pathway, was completely eliminated in the coil mutant. Jasmonateinduced anthocyanin accumulation was found to be independent of auxin signaling. The present results indicate that the expression of both COI1 and DFR genes is required for the regulation of JA-induced anthocyanin accumulation and that DFR may be a key downstream regulator for this process.展开更多
Jasmonates are a new class of plant hormones that play important roles in plant development and plant defense. The COI1 gene was previously shown to be required for jasmonate- regulated plant fertility and defense. We...Jasmonates are a new class of plant hormones that play important roles in plant development and plant defense. The COI1 gene was previously shown to be required for jasmonate- regulated plant fertility and defense. We demonstrated for the first time that COI1 interacts with the Arabidopsis SKP1-LIKE1 (ASK1) to form a complex that is required for jasmonate action in planta. Functional analysis by antisense strategy showed that ASK1 is involved in male fertility.展开更多
Benthodytes occidentpalauta sp.nov.was collected from the Kyushu-Palau Ridge at a depth of 5481 m in 2021.This new species is characterized by a gelatinous body wall,violet skin,six pairs of dorsal papillae,and a roug...Benthodytes occidentpalauta sp.nov.was collected from the Kyushu-Palau Ridge at a depth of 5481 m in 2021.This new species is characterized by a gelatinous body wall,violet skin,six pairs of dorsal papillae,and a rough mid-ventral surface without tube feet.The dorsal deposits are rod-shaped and tripartite.Two types of papillae deposits as crosses with four arms with central bipartite apophyses.Ventral deposits are rods.Tentacle ossicles are rod-shaped with end protrusions.Gonad deposits are rodshaped,tripartite,and cross-shaped.The phylogenetic analyses based on cytochrome oxidase subunit 1(COI)and 16S individually and a concatenated dataset of COI and 16S genes of this species support that B.occidentpalauta sp.nov.belongs to Benthodytes.展开更多
基金Supported by the Hunan Provincial Natural Science Foundation of China （99jjy20016） the National Natural Science Foundation of China （30470990） the Fu-Rong Scholar Program of Hunan Provincial Govemment and Hunan Agricultural University and Scientific Research Fund of Hunan Provincial Education Department （04A024）.
文摘Jasmonates （JAs） are a class of plant hormones that play important roles in the regulation of plant development and plant defense. It has been shown that Arabidopsis plants produce much higher levels of anthocyanins when treated exogenously with methyl jasmonate （MeJA）. However, a molecular link between the JA response and anthocyanin production has not been determined. The CORONATINE INSENTITIVE1 （COI1） gene is a key player in the regulation of many JA-related responses. In the present study, we demonstrate that the COI1 gene is also required for the JA-induced accumulation of anthocyanins in Arabidopsis. Furthermore, the MeJA-inducible expression of DIHYDROFLAVONOL REDUCTASE （DFR）, an essential component in the anthocyanin biosynthesis pathway, was completely eliminated in the coil mutant. Jasmonateinduced anthocyanin accumulation was found to be independent of auxin signaling. The present results indicate that the expression of both COI1 and DFR genes is required for the regulation of JA-induced anthocyanin accumulation and that DFR may be a key downstream regulator for this process.
基金This work was in part supported by the Foundation of Visiting Scientist of the Key Laboratory of University, Foundation of the Union Research Center of Hunan Life Sciences Hunan Natural Science Foundation
文摘Jasmonates are a new class of plant hormones that play important roles in plant development and plant defense. The COI1 gene was previously shown to be required for jasmonate- regulated plant fertility and defense. We demonstrated for the first time that COI1 interacts with the Arabidopsis SKP1-LIKE1 (ASK1) to form a complex that is required for jasmonate action in planta. Functional analysis by antisense strategy showed that ASK1 is involved in male fertility.
基金the National Key R&D Program of China(No.2022YFC2803902)the Project of State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,MNR(No.SOEDZZ2002)the Scientific Research Fund of the Second Institute of Oceanography,MNR(No.SZ2101)。
文摘Benthodytes occidentpalauta sp.nov.was collected from the Kyushu-Palau Ridge at a depth of 5481 m in 2021.This new species is characterized by a gelatinous body wall,violet skin,six pairs of dorsal papillae,and a rough mid-ventral surface without tube feet.The dorsal deposits are rod-shaped and tripartite.Two types of papillae deposits as crosses with four arms with central bipartite apophyses.Ventral deposits are rods.Tentacle ossicles are rod-shaped with end protrusions.Gonad deposits are rodshaped,tripartite,and cross-shaped.The phylogenetic analyses based on cytochrome oxidase subunit 1(COI)and 16S individually and a concatenated dataset of COI and 16S genes of this species support that B.occidentpalauta sp.nov.belongs to Benthodytes.
