ドロソフィラ・ウルトラスピラクルは,ヘテロジマー形成経由でエクディゾン受容体の機能を調節する
T P Yao1, W A Segraves, A E Oro
1Howard Hughes Medical Institute, La Jolla, California.
Cell
|October 2, 1992
まとめ
RXRのホモログであるドロソフィラ・ウルトラスピラクル (usp) は,エクディゾン受容体 (EcR) と提携して遺伝子発現を調節する. この発見は,内分泌系における受容体異体化による古代の役割を強調している.
科学分野:
- 分子内分泌学分子内分泌学
- 比較ゲノミクスとは
- 昆虫生理学 昆虫生理学とは
背景:
- 脊椎動物のレチノイドX受容体 (RXRs) は,ヘテロメア複合体を通してホルモン信号伝達を調節する.
- ウルトラスピラクル (usp) は,RXR.のドロソフィラ同種である.
研究 の 目的:
- 核受容体シグナル伝達におけるドロソフィラ・ウルトラスピラクル (usp) の機能的役割を調査する.
- uspのドロソフィラパートナーを特定し,それらの機能的相互作用を明らかにする.
主な方法:
- RXRに対するuspの機能的置換アッセイは,DNA結合を刺激する.
- エクディゾーン受容体 (EcR) を uspの結合パートナーとして特定.
- エクディゾンの反応性を評価するために,培養された哺乳類の細胞における共感染実験.
主要な成果:
- ドロソフィラ uspは,様々な核受容体のDNA結合を活性化するために,脊椎動物のRXRを代用することができます.
- uspは,ecdysone受容体 (EcR) と非常に協力的なDNA結合複合体を形成する.
- EcRとuspの共同発現は,哺乳類の細胞におけるecdysone誘発遺伝子発現に不可欠である.
結論:
- ドロソフィラ uspは,機能的なエクディゾン受容体 (EcR) 複合体の不可欠な構成要素です.
- RXR/uspを含む受容体ヘテロディメリゼーションは,おそらく脊椎動物と無脊椎動物の系統の分岐に先行する.
- これは,核受容体媒介による内分泌の調節と進化におけるRXRとuspの保存され,根本的な役割を強調しています.
関連する概念動画
Master Transcription Regulators
6.1K
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
6.1K
Positive and Negative Feedback Loops
14.9K
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis ("steady state"). Examples of these changes include regulation of the level of glucose or calcium in the blood or internal responses to external temperatures. Homeostasis requires maintaining an internal dynamic equilibrium:
14.9K
pH Regulation in Cells
5.4K
pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
5.4K
Feedback Regulation of Calcium Concentration
2.9K
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
2.9K
Transducer Mechanism: Nuclear Receptors
6.7K
Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:
6.7K
Transduction
3.0K
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
3.0K


