エプスタイン・バールウイルスの起源結合タンパク質EBNA 1のDNA結合ドメインの結晶構造
A Bochkarev1, J A Barwell, R A Pfuetzner
1Department of Pathology, McMaster University, Hamilton, Ontario, Canada.
Cell
|October 6, 1995
まとめ
エプスタイン・バーウイルス核抗原1 (EBNA1) の結晶構造は,2つのDNA結合ドメインを明らかにします. この発見は,EBNA1がウイルスの起源からDNA複製を活性化させる方法についての洞察を提供します.
科学分野:
- 構造生物学 構造生物学とは
- 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.
背景:
- エプスタイン・バーウイルス核抗原1 (EBNA1) は,ウイルスのDNA複製に不可欠です.
- EBNA1は複製の潜在起源 (oriP) に結合し,DNA複製を開始する.
- EBNA1の構造を理解することは,ウイルスの複製における EBNA1の機能を解読する上で極めて重要です.
研究 の 目的:
- EBNA1.1.のDNA結合と二酸化領域の結晶構造を決定する.
- EBNA1がDNAと相互作用する構造的基礎を解明する.
- EBNA1の構造を関連ウイルスタンパク質と比較する.
主な方法:
- X線結晶学を用いて,EBNA1ドメインの結晶構造を2.5A解像度で解明した.
- 構造分析と他の既知のタンパク質構造との比較が行われました.
主要な成果:
- 結晶構造は,2つの異なるDNA結合領域を明らかにしました:コアDNA結合領域と側面DNA結合領域です.
- ディメリゼーションドメインを含むコアドメインは,配列ホモロジーがないにもかかわらず,パピローマウイルスE2タンパク質との構造的類似性を示しました.
- 側面ドメインには,DNA認識要素の外部の領域を結合するアルファヘリックスが含まれています.
結論:
- EBNA1はDNA結合のために2つの独立したドメインを使用しています.
- EBNA1とパピローマウイルスE2の構造的類似性は,DNA結合の収束進化を示唆しています.
- これらの発見は,エプスタイン・バーウイルス複製におけるEBNA1の役割を理解するための構造的基盤を提供します.
関連する概念動画
The DNA Helix
163.1K
Overview
163.1K
The DNA Replication Fork
43.5K
An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork. Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
43.5K
DNA Helicases
25.1K
DNA unwinding helicase enzymes are a type of motor protein. Motor proteins can translocate along filaments or polymers using energy generated from ATP hydrolysis. Helicases are involved in all the important cellular processes where DNA unwinding is required, such as DNA replication, repair, recombination, and transcription. They are present in all living organisms, but vary in their structure, function, and mechanism of action. For example, in prokaryotes, DnaB helicase binds and translocates...
25.1K
Single-Strand DNA Binding Proteins
17.3K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
17.3K
The DNA Helix
31.8K
Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
31.8K
Nucleic Acid Structure
10.4K
The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
DNA Structure
DNA...
DNA Structure
DNA...
10.4K


