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单词 Negative regulation
释义

Negative regulation

原声例句
TED演讲（音频版） 2021年11月合集

They are incredibly powerful molecules, with a single microRNA having the ability to control up to 200 different targets in what is known as negative regulation.

它们是非常强大的分子，单个 microRNA 能够在所谓的负调节中控制多达 200 个不同的目标。

中文百科

操纵子 Operon

（重定向自Negative regulation）

操纵组（英语：operon，又称操纵子或操纵元）是一组关键的核苷酸串行，包括了一个操纵基因（operator），一个普通的启动子，及一个或以上的结构基因被用作生产信使RNA（mRNA）的基元。操纵子主要在原核生物及线虫动物门出现。它们由方斯华·贾克柏及贾克·莫诺于1961年发现。

操纵子是与调节子及刺激子有关：操纵子包含了一组受操纵基因调节的基因，调节子包含了一组受单一调节蛋白质的基因，而刺激子则包含一组受单一细胞调节的基因。

英语百科

Operon 操纵子

（重定向自Negative regulation）
Polycistronic operon Regulatory sequence Regulatory sequence Enhancer /silencer Operator Promoter 5'UTR ORF UTR ORF 3'UTR Enhancer /silencer Start Stop Start Stop Terminator Transcription DNA RBS Protein coding region RBS Protein coding region Translation mRNA Protein The structure of a prokaryotic operon of protein-coding genes. Regulatory sequence controls when expression occurs for the multiple protein coding regions (red). Promoter, operator and enhancer regions (yellow) regulate the transcription of the gene into an mRNA. The mRNA untranslated regions (blue) regulate translation into the final protein products.
1: RNA Polymerase, 2: Repressor, 3: Promoter, 4: Operator, 5: Lactose, 6: lacZ, 7: lacY, 8: lacA. Top: The gene is essentially turned off. There is no lactose to inhibit the repressor, so the repressor binds to the operator, which obstructs the RNA polymerase from binding to the promoter and making lactase. Bottom: The gene is turned on. Lactose is inhibiting the repressor, allowing the RNA polymerase to bind with the promoter, and express the genes, which synthesize lactase. Eventually, the lactase will digest all of the lactose, until there is none to bind to the repressor. The repressor will then bind to the operator, stopping the manufacture of lactase.
Prokaryotisches Operonmodell
Inaktives Lac-Operon

In genetics, an operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. The genes are transcribed together into an mRNA strand and either translated together in the cytoplasm, or undergo trans-splicing to create monocistronic mRNAs that are translated separately, i.e. several strands of mRNA that each encode a single gene product. The result of this is that the genes contained in the operon are either expressed together or not at all. Several genes must be co-transcribed to define an operon.
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更新时间：2025/6/26 0:46:19