…It is easily oxidized by atmospheric oxygen. Carotene is oxidized in the animal body and converted into two molecules of vitamin A, which then become vitamin A aldehyde (retinal), which plays an important role in the reception of light in vision. It also plays an important role in photosynthesis as an auxiliary pigment and protects against the damaging effects of light. … From [Rhodopsin]…The former reacts to strong light and is responsible for color vision, while the latter distinguishes light and dark in weak light, but is not related to color vision. Rhodopsin is a complex protein consisting of opsin, a component of the intracellular disk membrane with a molecular weight of 38,000, bound to 11-cis-retinal, a derivative of vitamin A. Vitamin A deficiency impairs the synthesis of rhodopsin, causing night blindness. … *Some terms that mention "retinal" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…空中酸素により容易に酸化される。カロチンは動物体内で酸化され2分子のビタミンAに変化し,さらにビタミンAアルデヒド(レチナールretinal)となり視覚の光受容に重要な機能をもっている。また補助色素として光合成に関与し,光の破壊作用からの保護機能などを有している。… 【ロドプシン】より…前者は強い光に反応して色覚をつかさどり,後者は弱い光のもとで明暗を識別するが,色覚には関係しない。ロドプシンは,細胞内のディスク膜の成分である分子量3万8000のオプシンopsinに,ビタミンAの誘導体11‐シス‐レチナールretinalが結合した複合タンパク質である。ビタミンAが欠乏するとロドプシンの合成が損なわれ夜盲症の原因となる。… ※「retinal」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 |
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