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Cell-free protein synthesis : ウィキペディア英語版
Cell-free protein synthesis
Cell-free protein synthesis (also called in-vitro protein synthesis or abbreviated CFPS), is the production of protein using biological machinery without the use of living cells. The in-vitro protein synthesis environment is not constrained by a cell wall or homeostasis conditions necessary to maintain cell viability. Thus CFPS enables direct access and control of the translation environment which is advantageous for a number of applications including optimization of protein production, optimization of protein complexes, to study protein synthesis, incorporating non-natural amino acids, high-throughput screens, and synthetic biology..
==Introduction==

Common components of a cell free reaction include a cell extract, an energy source, a supply of amino acids, cofactors such as magnesium, and the DNA with the desired genes. A cell extract is obtained by lysing the cell of interest and centrifuging out the cell walls, DNA genome, and other debris. The remains are the necessary cell machinery including ribosomes, aminoacyl-tRNA synthetases, translation initiation and elongation factors, nucleases, etc.
Two types of DNA can be used in CFPS: plasmids and linear expression templates (LETs). Plasmids are circular, and only made inside cells. LETs can be made much more effectively via PCR (see polymerase chain reaction), which replicates DNA much faster than raising cells in an incubator. While LETs are easier and faster to make, plasmid yields are usually much higher in CFPS. Because of this, much research today is focused on optimizing CFPS LET yields to approach the yields of CFPS with plasmids.
An energy source is an important part of a cell-free reaction. Usually,a separate mixture containing the needed energy source, along with a supply of amino acids, is added to the extract for the reaction. Common sources are phosphoenol pyruvate, acetyl phosphate, and creatine phosphate.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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