一例としてピルビン酸キナーゼでは、all-βの調整ドメイン、α/β-基質結合ドメイン、α/β-核結合ドメインがポリペプチドのリンカーで結合されている(George and Heringa, 2002a) 。これらのドメインは別々のファミリーに属している。
酵素の中心にあるTIMバレルの基質結合ドメインは最もよく見られるものの1つである[3]。これは相互に全く関係のない反応を触媒する多くの異なった酵素ファミリーの中に見られる(Hegyi and Gerstein, 1999)。TIMバレルはこのような構造のうち最も早くに構造が解かれたものである。CATHドメインデータベースには、現在26のホモログファミリーが分類されている(Orengo et al., 1997)。TIMバレルはβ-α-βというモチーフを持ち、末端同士が水素結合で閉じられている。起源については、大昔の1つの酵素にあったものが急速に拡散したという説や[4]、収束進化によるという説がある(Lesk et al., 1989)。
ピルビン酸キナーゼ中のTIMバレルは、ドメインを形成するのに2つ以上のポリペプチド鎖を要するという意味で「不連続」である。これはタンパク質の進化中にあるドメインが別のドメインの中に挿入されたためであると考えられている。これまで知られているドメインのうち、約4分の1が不連続となっている(Jones et al., 1998; Holm and Sander, 1994)。
共有結合している2つのドメインは、タンパク質の構造や機能の安定性の面において、共有結合していないものよりも有利である(Ghelis and Yon, 1979)。また共有結合は、触媒作用の中間体を安定化したり量比を固定するのにも役立つ(Ostermeier and Benkovic, 2000)。
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