不滅の細胞からの触媒的に活性なヒトテロメラーゼのタンパク質組成
Scott B Cohen1, Mark E Graham, George O Lovrecz
1Cancer Research Unit, Children's Medical Research Institute, 214 Hawkesbury Road, Westmead NSW 2145, Australia.
まとめ
研究者らは,がん細胞の生存に不可欠な酵素であるヒトテロメラーゼを精製した. 浄化された酵素は,
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
背景:
- テロメラーゼは,テロメアの長さを維持するために不可欠なリボヌクレオプロテイン酵素複合体です.
- この酵素は,ヒトの染色体末端に5'-TTAGGG-3'の繰り返しを加える.
- テロメラーゼによるテロメア維持は,約90%のヒトがんに不可欠です.
研究 の 目的:
- 触媒的に活性なヒトテロメラーゼを浄化する.
- 精製された酵素のタンパク質とRNA成分を決定する.
主な方法:
- 人間のテロメラーゼの高倍精製.
- テロメアDNAオリゴヌクレオチドを用いた触媒活動に依存するエリューション.
- タンパク質の識別のための質量スペクトロメトリックシーケンシング.
- 分子サイズ決定. 分子サイズ決定.
主要な成果:
- ヒトテロメラーゼは,約10~8倍に精製されました.
- 浄化により,触媒的に活性なテロメラーゼが生じた.
- 質量スペクトロメトリーは,テロメラーゼ逆転写酵素,テロメラーゼRNA,およびディスカリンのそれぞれ2つの分子として酵素の組成を特定しました.
結論:
- この研究では,活性ヒトテロメラーゼを成功裏に浄化しました.
- ヒトのテロメラーゼの成分が明らかになった.
- テロメラーゼの組成を理解することは,がんの研究と治療の開発に不可欠です.
関連する概念動画
Protein Digestion
Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.
Protein Complex Assembly
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Lysosomes
Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...
Role of Proteins in the Human Body
Proteins are the building block of life. They are also the most abundant macromolecules with as many diverse roles in the body. They are part of many structural components that provide unique shapes and structures to animal cells, tissues, and organs. In addition, they also act as biological catalysts and carry out several anabolic and catabolic reactions. Notably, some proteins are chemical messengers and regulate many critical processes, such as metabolism, growth, and development. They are...
The Proteasome Structure
The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
The proteasome is an...


