当细胞内有不缺乏Trp或Trp-tRNA时,核糖体可翻译前导肽至终止密码子,这时最后的两段RNA互补序列形成一个典型的不依赖Rho的终止结构。导致RNA聚合酶终止色氨酸操纵子的转录,此为衰减子调控。[考点]衰减子调控机制。在阻遏型操纵子中第一个结构基因之前常有一段能减弱转录的序列,称为衰减子。当操纵子被阻遏,RNA...
Present a model to explain attenuation(衰减作用) in the trp operon(色氨酸操纵子) 相关知识点: 试题来源: 解析 色氨酸的操纵区和第一个结构基因E之间存在一段前导肽序列(The leader sequence ),其中包含一个弱化子位点(an attenuator site),有色氨酸的浓度决定转录是否在该位点上终止. 前导肽基因含有4个...
以大肠杆菌色氨酸操纵子为例说明衰减子调控机制:细菌的转录和翻译几乎同步进行,RNA聚合酶在转录前导序列时,核糖体和相应的tRNA紧随其后翻译前导肽。当介质中Trp浓度很低时,tRNA-trp相应短缺,核糖体移至重叠区两个Trp密码子时因缺少相应tRNA-trp而停滞不前,使1区不能和2区配对,所以2区和3区配对,结果不能形成3-...
以大肠杆菌色氨酸操纵子为例说明衰减子调控机制:细菌的转录和翻译几乎同步进行,RNA聚合酶在转录前导序列时,核糖体和相应的tRNA紧随其后翻译前导肽。当介质中Trp浓度很低时,tRNA-trp相应短缺,核糖体移至重叠区两个Trp密码子时因缺少相应tRNA-trp而停滞不前,使1区不能和2区配对,所以2区和3区配对,结果不能形成3-...
网络操纵子和弱化 网络释义 1. 操纵子和弱化 强权和文... ... ) cultural manipulator 文化操纵者 )trp Operon and Attenuationtrp操纵子和弱化) forced maneuver 强制操纵 ... www.dictall.com|基于15个网页
Two rpoB mutations that suppress the temperature defect of the dnaA46 mutation in initiation of replication were tested for effects on attenuation in the tryptophan operon. One of the rpoB mutations caused increased transcription termination at the attenuator independent of the dnaA allele, whereas ...
[主观题] 解释色氨酸操纵子中的衰减子调控(Attenuation regulation in Trp Operon)机制。解释色氨酸操纵子中的衰减子调控(Attenuation regulation in Trp Operon)机制。 查看答案更多“解释色氨酸操纵子中的衰减子调控(Attenuation regulation in Trp Operon)机制。”相关的问题 第1题 什么是应急调控(Strigent ...
Trp operon and attenuation. In: Lennarz, W.J., Lane, M.D. eds. (2004) Encyclopedia of Biological Chemistry. Elsevier, New York, pp. 267-271Gollnick, P.: Trp operon and attenuation. In Lennarz, W.J., Lane, M.D., eds.: Encyclopedia of Biological Chemistry. Elsevier, New York (...
Expression of the Bacillus subtilis trpEDCFBA operon has been shown to be regulated by transcription attenuation in response to the availability of L-tryptophan. Regulation is mediated by the tryptophan-activated trp RNA-binding attenuation protein, TRAP, the product of mtrB. Formation of mutually ...
In this fictitious experiment two trp operon mutants are used: in one of them the two UGG codons coding for tryptophan were converted to GGGs (codons for glycine; designated “trp codon mutant” throughout the test); in the other one, region 3 was deleted (“region 3 mutant”). Wild-ty...