ヒト免疫不全ウイルスのrev遺伝子製品は,エンベロープ特異的なRNA局所化に影響を与えます
1Unité d'Oncologie Virale, Institut Pasteur, CNRS UA1157, Paris, France.
Cell
|June 30, 1989
まとめ
ヒト免疫不全ウイルスのRevタンパク質は,包膜RNAを細胞プラズマに輸送できるようにすることで,包膜タンパク質発現に不可欠です. Revがなければ,ウイルスのRNAは核に閉じ込められ,HIVの複製を妨げます.
科学分野:
- ウイルス学 ウイルス学 ウイルス学
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
背景:
- ヒト免疫不全ウイルス (HIV) は,ウイルスの複製のために構造タンパク質の効率的な発現を必要とします.
- HIV遺伝子発現を制御する規制メカニズムを理解することは,抗ウイルス治療の開発に不可欠です.
研究 の 目的:
- ウイルスエンベロップの遺伝子発現の調節におけるHIV Revタンパク質の役割を調査する.
- Rev媒介RNAの輸送と発現に関与するシス作用元素を特定する.
主な方法:
- トランスフェクトされたCOS細胞におけるin situハイブリダイゼーション分析.
- 免疫プレシピテーションアッセイ.
- RNAの局所化とタンパク質発現の分析.
主要な成果:
- HIV Revタンパク質は,封筒タンパク質の発現に必要である.
- エンベロープ固有のRNAは,Rev.の存在下で細胞質に運ばれます.
- Revが存在しない場合,封筒RNAは核に留まります.
- 封筒遺伝子内の特定のシス作用配列は,Rev依存RNAの輸出と核保持に関与しています.
結論:
- HIV Revタンパク質は,細胞プラズマの局所化を促進し,その後の封筒RNAの発現に重要な役割を果たします.
- RNA輸送のRev-mediated調節は,従来のスプライシング経路とは独立しています.
- シス作用部位を特定することで,Rev.機能の分子機構の洞察が得られます.
関連する概念動画
Retrovirus Life Cycles
43.0K
Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
43.0K
Retroviruses
12.1K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.1K
Regulated mRNA Transport
5.7K
In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
5.7K
Leaky Scanning
4.5K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
4.5K
Size and Structure of Viral Genomes
1.2K
Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
1.2K
Viruses with RNA Genomes
1.5K
RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
1.5K


