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自然界中植物的生长发育受到各种环境变化的影响。为了响应外界各种环境条件,植物演化出一系列识别和传递环境信号的蛋白分子,其中比较典型的是植物细胞质膜上的类受体蛋白激酶(RLKs)。凝集素类受体蛋白激酶(LecRLKs)是类受体蛋白激酶家族中的一个亚族,它主要包含3个结构域:细胞外凝集素结构域、跨膜结构域和细胞内激酶结构域。根据细胞外凝集素结构域的不同,LecRLKs可分为3种不同类型:L、G和C型。近年来,研究表明LecRLKs在植物生物/非生物胁迫和发育调控中发挥非常重要的作用。该文综述了植物凝集素类受体蛋白激酶的研究历史、结构特点、分类以及生物学功能,并重点阐述凝集素类受体蛋白激酶在植物生物/非生物胁迫响应和调控发育方面的功能。对不同类型和不同功能的植物凝集素类受体蛋白激酶进行阐述将有利于对该类蛋白开展功能研究,并为作物改良提供有益借鉴。 相似文献
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《植物学报》2020,(1)
自然界中植物的生长发育受到各种环境变化的影响。为了响应外界各种环境条件,植物演化出一系列识别和传递环境信号的蛋白分子,其中比较典型的是植物细胞质膜上的类受体蛋白激酶(RLKs)。凝集素类受体蛋白激酶(LecRLKs)是类受体蛋白激酶家族中的一个亚族,它主要包含3个结构域:细胞外凝集素结构域、跨膜结构域和细胞内激酶结构域。根据细胞外凝集素结构域的不同, LecRLKs可分为3种不同类型:L、G和C型。近年来,研究表明LecRLKs在植物生物/非生物胁迫和发育调控中发挥非常重要的作用。该文综述了植物凝集素类受体蛋白激酶的研究历史、结构特点、分类以及生物学功能,并重点阐述凝集素类受体蛋白激酶在植物生物/非生物胁迫响应和调控发育方面的功能。对不同类型和不同功能的植物凝集素类受体蛋白激酶进行阐述将有利于对该类蛋白开展功能研究,并为作物改良提供有益借鉴。 相似文献
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受体蛋白激酶是蛋白激酶家族中的重要一类。根据其胞外受体结构域的组成不同 ,植物受体蛋白激酶可划分为不同的类型。近些年的研究发现 ,蛋白激酶是植物发育和抗性反应中重要成分 ,是信号分子的重要受体 ,在信号传导过程中起着重要作用。随着对植物发育过程中信号传导机理认识的不断深入 ,人们有望通过操作植物发育过程向人们需要的方向发展 ,达到控制果实的大小和提高产量的目的。 相似文献
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植物受体蛋白激酶通过与胞外信号结合感知和接收外部信号传递,在植物各个生理过程及生物代谢中发挥着重大的作用。其中M/MLD类受体蛋白激酶是一类植物特有的具有Malectin-like结构域的受体蛋白激酶。研究表明,M/MLD-RLKs亚家族参与植物发育过程及生物/非生物胁迫调控。该研究对近年来国内外有关植物M/MLD-RLKs的发现、结构特点以及生物学功能等方面的研究进展进行综述,并重点阐述其在调控植物根系、叶片、花发育及响应多种胁迫过程中的作用,为深入研究M/MLD-RLKs在植物生长发育过程中的生理功能提供参考。 相似文献
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植物中钙依赖蛋白激酶(CDPKs)的结构与功能 总被引:1,自引:0,他引:1
在植物细胞中,钙离子作为第二信使,通过钙依赖蛋白激酶(CDPKs)发挥功能是其传递信号的主要途径之一。CDPKs广泛存在于植物体内,是目前植物体内研究最深入的蛋白激酶。在简要阐述CDPKs于植物体内的分布定位的基础上,介绍了CDPKs的结构特点、生化性质及其在植物细胞生理功能中的作用,并就该领域的研究前景作了展望。 相似文献
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在小麦抗叶锈近等基因系TcLr45中扩增出一条凝集素类受体蛋白激酶基因片段。以该序列为靶序列进行3’和5’RCAE-PCR,获得该基因cDNA全长片段为2347bp,该序列具有完整的开放阅读框,共编码730个氨基酸,命名为LecRK-LR45。经软件分析, LecRK-LR45具有典型的凝集素类受体蛋白激酶结构,属于L类型。聚类分析结果表明,LecRK-LR45与山羊草、小麦(Lr34)中的凝集素类受体蛋白激酶基因具有较近的亲缘关系,与玉米、拟南芥的亲缘关系较远。该基因的克隆为研究小麦中凝集素类受体蛋白激酶的功能奠定基础。 相似文献
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植物受体蛋白激酶的研究进展 总被引:1,自引:0,他引:1
在植物中存在一种由胞外结构域、跨膜区域和胞内的蛋白激酶区域三部分组成的跨膜受体蛋白激酶(receptor-lik protein kinases,RLKs)。该蛋白一方面作为胞外特异配基的受体,同时本身又是一种蛋白激酶。研究表明,植物细胞中的RLKs可能参与了植物细胞抗逆反应,植物形态发生、自交不亲和等生理生化反应,作者将从RLKs的结构、种类,基因表达方式及其植物生长和发育过程中的作用做简要介绍。 相似文献
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Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis
It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis. 相似文献
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RICHARD E. NORRIS 《Botanical journal of the Linnean Society. Linnean Society of London》1991,106(1):1-40
Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera. 相似文献
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JOAN VALUÈS MONTSERRAT TORRELL NÚRIA GARCIA JACAS 《Botanical journal of the Linnean Society. Linnean Society of London》2001,137(4):399-407
Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted. 相似文献
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肝癌中HBV和HCV基因和抗原的分布及意义 总被引:1,自引:0,他引:1
采用原位分子杂交方法检测HCV
RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV
RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV
RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV
X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV
C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细 相似文献
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H.-R. GREGORIUS 《Biological journal of the Linnean Society. Linnean Society of London》1984,23(2-3):157-165
For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献