…Feedback inhibition is essentially different from the previously known inhibition of enzyme synthesis, i.e. repression, and is derived from the specific interaction between a specific enzyme molecule and a specific initial product. As a result of research by Purdy et al., in the case of aspartate carbamoyltransferase (ATCase) shown in Figures 10 and 11, for example, it was revealed that the final product, CTP (cytidine triphosphate), binds to the control center present in the regulatory subunit of ATCase, which catalyzes the initial reaction, and the activity of the enzyme is regulated through a change in the higher-order structure of the enzyme protein. J. Monod, who had just published the operon theory, became interested in this phenomenon and gave it the name allosteric effects, meaning the regulation of activity by a substance with a different structure from the substrate. … *Some of the terminology that mentions "aspartate carbamoyltransferase" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…フィードバック阻害は,先に知られていた酵素合成の抑制,すなわちリプレッションとは本質的に異なり,特定の酵素分子と特定の最初生成物との特異的相互作用に由来している。パーディーらの研究の結果,たとえば図10,図11に示すアスパラギン酸カルバモイル転移酵素(ATCアーゼ)の場合には,最終産物であるCTP(シチジン三リン酸)が,初発段階の反応を触媒するATCアーゼの調節サブユニットに存在している制御中心に結合し,酵素タンパク質の高次構造変化を介して酵素の活性が調節されるというしくみが判明した。ちょうどオペロン説を発表したJ.モノーがこのような現象に興味を示し,基質とは構造が異なる物質による活性の調節という意味で,アロステリック効果allosteric effectsという名を与えた。… ※「アスパラギン酸カルバモイル転移酵素」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 |
>>: Aspartate aminotransferase
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