Cooperative effects

...By the way, there are many enzymes whose substrate saturation curves are not hyperbolic, but are S-shaped (sigmoidal) or rectangular, as shown in Figure 6. This phenomenon is often seen in allosteric enzymes and is called cooperative effects. The properties of such curves are expressed by a parameter called the Hill coefficient (abbreviated as n ). The Hill coefficient can be calculated by drawing the graph in Figure 8. ...

*Some explanations of terms that refer to "cooperative effects" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…ところで，酵素の中には基質飽和曲線が双曲線性でなく，図6のようにS字性(シグモイド性)や矩形に近い形を与えるものも少なくない。この現象はアロステリック酵素によく見られるもので，協同効果cooperative effectsと呼ばれるが，このような曲線の性質をヒル係数Hill coefficient(nと略記)というパラメーターで表す。ヒル係数は図8の作図によって求められる。…

※「cooperative effects」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報