関連する実験動画
Updated: Jan 24, 2026
01:23
The Thyroid Gland
6.8K
トランスクリプションは,テンプレート内のポジティブとネガティブにスーパーコイルされたドメインを生成します
1Department of Biological Chemistry, Johns Hopkins School of Medicine, Baltimore, Maryland 21205.
Cell
|May 6, 1988
まとめ
トランスクリプションは,細菌のDNAにスーパーコイルを作り出し,トランスクリプション機構の前と後ろに異なる正と負のドメインが形成されます. DNAトポイソメラーゼは,DNA転写中のこの超巻きの管理に不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- DNAスーパーコイリングは,DNA複製と転写に影響を与える重要な要因です.
- ギラゼやトポイソメラーゼIなどの細菌DNAトポイソメラーゼは,DNAトポロジーを調節する.
- トランスクリプションとスーパーコーリングのダイナミクスとの正確な関係は,in vivoではまだ完全に理解されていません.
研究 の 目的:
- バクテリア内のDNAスーパーコイリングに対するトランスクリプションのインビボ効果を調査する.
- 転写誘発型スーパーコイリングの管理におけるDNAトポイソメラーゼの役割を明らかにする.
主な方法:
- 抑制されたDNAギラゼまたはトポイソメラーゼIの活動条件下で,プラズミド結合数の変化をモニタリングする.
- リンク番号の変化が活性転写と転写単位の方向性に依存しているかを分析する.
主要な成果:
- トランスクリプションは,トランスクリプション複合体の前に局所的な陽性スーパーコイルを誘導し,トランスクリプション複合体の背後には負のスーパーコイルを誘導します.
- DNAギラゼまたはトポイソメラーゼIの阻害は,転写に依存するプラズミド結合数の重要な変化につながります.
- これらのトポロジカルな変化は,プラズミド上の転写単位の方向性に敏感である.
結論:
- バクテリアのDNAスーパーコイリングは,転写プロセスによって動的に調節されます.
- DNAトポイソメラーゼは,トポロジカルストレスを解消するために,転写の延長段階において不可欠な役割を果たします.
関連する概念動画
The Thyroid Gland
6.8K
The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
6.8K
Functions of Thyroid Hormones
5.1K
The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
5.1K
Synthesis and Regulation of Thyroid Hormones
7.3K
Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
Upon reaching the thyroid gland, TSH stimulates the follicular cells' active uptake of iodide ions from the blood. The ions diffuse to the apical surface of the cells and are oxidized to iodine. The...
7.3K
Sustainable Development
14.8K
As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
14.8K
Pedigree Analysis
89.0K
Overview
89.0K
Development of the Lymphatic System
2.0K
The development of lymphatic tissues and vessels in embryonic life begins around the fifth week. These structures originate from the mesoderm layer, with lymph sacs emerging from developing veins.
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
The first lymph sacs to form are the paired jugular lymph sacs located at the junction of the internal jugular and subclavian veins. From these sacs, lymphatic capillary plexuses extend to the thorax, upper limbs, neck, and head, eventually forming lymphatic vessels. Each jugular lymph sac maintains a...
2.0K