AppAは青い光の光受容体で,Rhodobacter sphaeroidesの光合成遺伝子発現を抑制する
1Department of Biology, Indiana University, Bloomington, IN 47405, USA.
Cell
|September 17, 2002
まとめ
PpsR抑制器は,Rhodobacter sphaeroidesにおける光系遺伝子発現を制御する. アンチレプレッサーAppAは,レドックスと青い光を介してPpsRDNA結合を調節し,光システム合成に影響を与えます.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- バイオケミストリー バイオケミストリー
背景:
- 光合成細菌は,酸素や光のような環境のシグナルに反応して,光システム合成を調節する.
- PpsR抑制剤は,光学系遺伝子発現を制御する上で重要な役割を果たします.
研究 の 目的:
- PpsR抑制器の酸化還元依存性DNA結合メカニズムを解明する.
- 異なる照明条件下でPpsR活動を調節するアンチレプレッサーAppAの役割を調査する.
主な方法:
- PpsR DNA結合を研究するために,電泳運動シフトアッセイ (EMSAs) を実施する.
- AppAの光周期とPpsRとの相互作用を特徴付けるためのスペクトル解析.
- サイト・ディレクテッド・ミュータゲネシスは,PpsR.におけるディスルファイド結合形成を理解するためのものです.
主要な成果:
- PpsRは,分子内ジスルファイド結合を介して,酸化還元に依存した方法でDNAを結合します.
- AppAは,二酸化硫化物結合を断ち,安定した複合体を形成することによって,PpsRに敵対する.
- AppAの青光刺激はAppA-PpsR複合体の形成を防止し,PpsR抑制を解放する.
結論:
- AppAは写真系遺伝子発現を制御する転写因子として作用する.
- AppAは,PpsR DNA結合を調節するために,リドックスとブルーライト信号を統合します.
- このメカニズムは,光合成細菌における光システム遺伝子調節の包括的な理解を提供します.
さらに関連する動画
09:32Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
Published on: June 15, 2017
08:09Electrophysiological Methods for Measuring Photopigment Levels in Drosophila Photoreceptors
Published on: June 2, 2022
関連する概念動画
Photoreceptors and Plant Responses to Light
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
The Photochemical Reaction Center
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
Channel Rhodopsins
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Repressible Operon: trp Operon
The trp operon in Escherichia coli exemplifies a repressible operon. It regulates the synthesis of tryptophan through repressor-mediated transcriptional control and attenuation. This dual regulatory mechanism ensures tryptophan biosynthesis occurs only when needed, conserving cellular resources.Structure of the trp OperonThe trp operon consists of five structural genes (trpE, trpD, trpC, trpB, and trpA) that encode enzymes for tryptophan biosynthesis. These genes are transcribed as a single...
Anoxygenic Phototrophic Bacteria
Anoxygenic phototrophic bacteria are a diverse group of microorganisms that perform photosynthesis without producing oxygen. They primarily include purple sulfur bacteria, purple nonsulfur bacteria, green sulfur bacteria, and green nonsulfur bacteria. These bacteria are classified into the Gammaproteobacteria, Alphaproteobacteria, Betaproteobacteria, Chlorobi, and Chloroflexi lineages, each with distinct physiological and ecological adaptations.Purple sulfur bacteria belong to the...
