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1.
厌氧状态下植物蛋白质的功能,合成及其调节   总被引:3,自引:0,他引:3  
植物的生长发育过程中常常遇到下列逆境条件,它们是:干旱、涝害、高温或低温、盐害、重金属离子、高强度辐射、有害气体、以及致病因子感染等。由于植物的不能运动性,它们必须对自身的代谢及结构进行必要的调整以应付这些逆境条件。为了这一目的,正常植物  相似文献   

2.
本文论述了蛋白质生物合成的遗传信息的来源,基因与蛋白质合成的遗传信息的关系,翻译的准确性的依据,真核生物蛋白质生物合成的特点,并就蛋白质合成及其调节研究的最新进展作了介绍。  相似文献   

3.
植物过敏性蛋白质及其生物学功能   总被引:2,自引:0,他引:2  
在引起I型超敏反应的变应原中 ,植物的花粉、果实和汁液可以分别作为吸入性变应原 (inhalentallergen)、食入性变应原 (ingestentallergen)、接触性变应原 (contactentallergen)使过敏者患上鼻炎、哮喘、枯草热等疾病。而其中引起这些超敏反应的植物类蛋白质本身在植物体内亦行使着特定的生物学功能。对这些植物类过敏性蛋白质的研究不仅在植物学本身研究中具有一定意义 ,同时在变态反应性疾病的免疫治疗中亦具有重要的应用价值。目前 ,这类涉及植物学、免疫学和变态反应学的研究逐渐形成了一个新的交叉研究领域。  相似文献   

4.
近年来我们对体内的蛋白质生物合成,已有了稍为深入的了解,但是还不能解答,哺乳动物体内从同一受精卵发育、分化而来的各种组织或细胞,理应含有相同遗传信息,何以其所合成的蛋白质并不完全相同?例如,胰岛β细胞合成的蛋白质主要是胰岛素,而肝细胞合成的蛋白质却主要是血浆清蛋白。不仅如此,即使在同一种细胞中,不同时间合成的蛋白质的种类和数量亦可有所不同,这又是为什么? 据了解,在体内各种蛋白质的合成并非漫  相似文献   

5.
植物离子通道特征、功能、调节与分子生物学   总被引:6,自引:1,他引:6  
本文对植物离子通道的特征、生理功能、影响通道启闭的因素和通道分子生物学研究的新进展作了较为系统的综述  相似文献   

6.
植物蛋白质合成延伸因子   总被引:1,自引:0,他引:1  
蛋白质的生物合成是一个需要许多大分子如起动因子、延伸因子、终止因子、核糖体、信使RNA、氨酰合成酶和tR NA协同作用的复杂的生理生化过程。植物蛋白质合成延伸因子eEF1和eEF2通过在核糖体上催化氨基酸链的延伸而推动、控制蛋白质的合成。文章介绍植物蛋白质生物合成延伸因子的研究进展  相似文献   

7.
本文对植物离子通道的特征、生理功能、影响通道启闭的因素和通道分子生物学研究的新进展作了较为系统的综述。  相似文献   

8.
植物蔗糖转运蛋白及其功能调节研究进展   总被引:1,自引:0,他引:1  
综述了高等植物蔗糖转运蛋白基因家族的分类,蔗糖转运蛋白的细胞定位,蔗糖转运蛋白的功能调节,以及果实中糖运转的特性等方面的研究进展,并提出了深入研究果实蔗糖运转蛋白的展望。  相似文献   

9.
钙调节蛋白及其在植物体内的功能   总被引:21,自引:0,他引:21  
1967~1970年期间张槐耀(W.Y.Chen-ng)在提纯研究环腺苷酸磷酸二脂酶时在一个偶然的机会中首先在动物里发现了它的激活因子—钙调节蛋白(Calmodulin简称CaM,下同)。十年后,Anderson和Corm-ier与 Waisman和 Wang(1978)分别证实植物内NAD激酶的激活蛋白实际上也就是  相似文献   

10.
种子萌发时胚的生长需要营养物质。禾谷类的种子在胚乳中贮藏着丰富的养分。这些贮藏物质的动用主要受植物激素赤霉素(GA)的控制。GA是在胚中合成,经过盾片输送到胚乳周围的糊粉层细胞-GA发生作用的靶细胞。糊粉层组织由均一的、不分裂的、富含蛋白质的二到三层细胞组成,这些细胞对GA反应时合成多种水解酶如a-淀粉酶和蛋白酶。这些酶被分泌释放到胚乳中去,水解大分子贮藏物质淀粉和蛋白质等形  相似文献   

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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   

13.
    
Zhao  Li  Gao  Ruqin  Lu  Roujian  Wang  Huijuan  Deng  Yao  Niu  Peihua  Jiang  Fachun  Huang  Baoying  Liang  Jiwei  Jia  Jing  Zhang  Feng  Wang  Wenling  Wu  Guizhen  Tan  Wenjie 《中国病毒学》2021,36(5):1088-1092
  相似文献   

14.
    
Han  Zhenzhi  Xiao  Jinbo  Song  Yang  Zhu  Shuangli  Wang  Dongyan  Lu  Huanhuan  Ji  Tianjiao  Yan  Dongmei  Xu  Wenbo  Zhang  Yong 《中国病毒学》2021,36(6):1652-1655
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17.
    
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   

18.
    
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   

19.
    
正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases  相似文献   

20.
Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.  相似文献   

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