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Message definition (Vitamin B12 ) ==Definition== Vitamin B<sub>12</sub> is a [[coordination complex]] of [[cobalt]], which occupies the center of a [[corrin]] ligand and is further bound to a [[benzimidazole]] ligand and adenosyl group. A number of related species are known and these behave similarly, in particular all function as vitamins. This collection of compounds is sometimes referred to as "cobalamins". These chemical compounds have a similar molecular structure, each of which shows vitamin activity in a vitamin-deficient biological system, they are referred to as [[vitamer]]s. The vitamin activity is as a [[coenzyme]], meaning that its presence is required for some enzyme-catalyzed reactions. * [[adenosylcobalamin]] * [[cyanocobalamin]], the adenosyl ligand in vitamin B<sub>12</sub> is replaced by [[cyanide]]. * [[hydroxocobalamin]], the adenosyl ligand in vitamin B<sub>12</sub> is replaced by [[hydroxide]]. * [[methylcobalamin]], the adenosyl ligand in vitamin B<sub>12</sub> is replaced by [[methyl]].
定義
ビタミンB12 はコバルト の配位錯体 で、コリン 配位子の中心を占め、さらにベンズイミダゾール 配位子とアデノシル基が結合している。多くの近縁種が知られており、これらは同様の挙動を示し、特にすべてがビタミンとして機能する。この化合物群は「コバラミン」と呼ばれることもある。これらの化合物は類似した分子構造を持ち、それぞれがビタミン欠乏の生体系でビタミン活性を示すことから、ビタマー と呼ばれる。ビタミンの活性は補酵素 としてのもので、酵素触媒反応にその存在が必要であることを意味する。