まとめ
研究者らは,ras遺伝子に類似した,種を超えて保存された対称性を持つrho遺伝子ファミリーを発見しました. これらのrhoタンパク質は,rasタンパク質と機能的特性を共有しており,細胞プロセスにおける異なる役割を示唆しています.
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
- 細胞生物学 細胞生物学
背景:
- クラシックなras遺伝子ファミリー (N-,K-,およびH-ras) は,細胞シグナル伝達において重要な役割を果たしています.
- 関連する遺伝子ファミリーを理解することは,細胞調節の包括的な見方にとって不可欠です.
研究 の 目的:
- ras.に関連した新しい遺伝子ファミリーを特定し,特徴づけること.
- 新しく特定されたロ遺伝子の進化的保存と機能的特性を調査する.
主な方法:
- Aplysia californicaの腹部ガンリアのcDNAライブラリからrho遺伝子の分離.
- rhoタンパク質とH-rasタンパク質のアミノ酸配列ホモロジー分析.
- イースト,ドロソフィラ,ラット,ヒトを含む様々な種間の比較シーケンスの分析.
主要な成果:
- H-ras. と 35% のアミノ酸ホモロジーを持つタンパク質をコードする rho 遺伝子ファミリーの識別.
- 進化的に保存されたrho同類の検出.様々な生物で.
- アプリシアとヒトのロタンパク質の間の高シーケンスホモロジー (85%以上)
- 分子重量 (21,000ダルトン) とC末端の膜結合配列を含む,rasおよびrho遺伝子産物間の共通の特性.
結論:
- rho遺伝子ファミリーは,rasに関連する遺伝子の新しいクラスを表しています.
- 保存された機能ドメインは,細胞経路におけるrasおよびrhoタンパク質の役割が共有されているが,異なることを示唆する.
- rho遺伝子の機能に関するさらなる研究は,その特定の細胞の役割を明らかにするために正当化されています.
関連する概念動画
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
Rous Sarcoma Virus (RSV) and Cancer
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
Rab Cascades
Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
Small GTPases - Ras and Rho
Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Three regulatory proteins control their activity:
Rous Sarcoma Virus (RSV) and Cancer
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...


