関連する実験動画
Updated: Jul 1, 2026
09:51
Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
タンパク質宇宙の構造とゲノムの進化
Eugene V Koonin1, Yuri I Wolf, Georgy P Karev
1National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, USA. koonin@ncbi.nih.gov
Nature
|November 15, 2002
まとめ
タンパク質の折りたたみの数は有限で小さく,分布は不均一である. ゲノム進化は,スケールフリーネットワークに類似した,好ましい結合のような一般的なメカニズムによって駆動されているようです.
科学分野:
- 構造生物学 構造生物学とは
- ゲノミクスゲノミクスとは
- ネットワーク理論 ネットワーク理論
背景:
- 理論的には,タンパク質配列は事実上無限です.
- しかし,異なるタンパク質の折りたたみ (3D構造) の数は有限で,驚くほど小さい.
- これらの折りたたみにおけるタンパク質の分布は極めて不均一で,一般的な折りたたみと珍しい折りたたみがある.
研究 の 目的:
- タンパク質の折り畳み分布の数学的性質を調査する.
- タンパク質の折り畳み分布とゲノム進化の関係を探求する.
- これらの分布が普遍的な数学法則に従っているかどうかを判断する.
主な方法:
- タンパク質の折りたたみと超家族分布の分析,様々なゲノムにわたって.
- 多領域タンパク質におけるドメイン接続性の検討.
- パワー・ローの分布を特定するために統計分析を適用する.
主要な成果:
- タンパク質の折りたたみとファミリーサイズ分布は,パワー法則と一致する数学的性質を示しています.
- これらの分布は,異なるゲノム全体で類似しており,多領域タンパク質構造にまで及ぶ.
- 観測された分布は,スケールフリーネットワークの特徴と一致しています.
結論:
- タンパク質の折り畳み分布は,一般的な数学的原理,特にパワー法則によって支配されます.
- ゲノム進化には,好ましい結合などのメカニズムが含まれており,スケールフリーネットワークの特性につながります.
- これらの発見は,生物システムの発達における普遍的な原動力を示唆しています.
関連する概念動画
01:13Protein Organization
Overview
02:47Protein Families
Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism. Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members. If these new proteins contain similar amino acids in key locations, protein...
02:11Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
02:47Protein Families
Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism. Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members. If these new proteins contain similar amino acids in key locations, protein...
02:11Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
01:24Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.