これら2つのドメインがきわめて近接して存在していることや、いくつかの実験的データからは、これらは直接的な物理的相互作用を行うことでキナーゼドメインの活性を負に調節する単一のユニットとして機能することが示唆されている[24]。歴史的に、この自己阻害ブロックはCR1(Conserved Region 1)と呼ばれており、ヒンジ領域はCR2、キナーゼドメインはCR3と呼ばれていた。自己阻害状態のキナーゼの正確な構造はまだ明らかではない。
自己阻害ブロックとキナーゼドメインの間には、すべてのRafタンパク質に特有の長いフラグメントが存在する。このフラグメントはセリンに富むものの、関連するRafの間での配列の保存性は低い。この領域は構造を持たず、非常に柔軟性が高いようである。この領域の役割として最も可能性が高いのは、堅く折りたたまれた自己阻害ドメインと触媒ドメインとの間の「ヒンジ」としての機能であり、分子内の複雑な動きや大きなコンフォメーション変化を可能にしていると考えられている[25]。このヒンジ領域には、14-3-3タンパク質の認識を担う、小さな保存された領域(short linear motif)が含まれるが、認識が行われるのは重要なセリン残基(ヒトのc-Rafではセリン259番残基(Ser259))がリン酸化されているときのみである。同様のモチーフはすべてのRafのC末端付近(キナーゼドメインよりも下流、リン酸化されるSer621を中心とする領域)にも存在する。
c-RafのC末端側の半分は単一のドメインへと折りたたまれ、触媒活性を担う。このキナーゼドメインの構造は、c-Raf[26]とB-Raf[27]の双方で詳細に解明されている。このドメインは他のRafキナーゼやKSR(kinase suppressor of Ras)タンパク質ときわめて類似しており、MLK(mixed lineage kinase)ファミリーなど、他のMAP3Kの一部とも明らかに類似している。これらはプロテインキナーゼのTKL(tyrosine kinase like)グループを構成する。これらの触媒ドメインの特徴の一部はチロシンキナーゼとも共通であるが、TKLグループのキナーゼの活性は標的タンパク質のセリンとスレオニン残基のリン酸化に限定されている。Rafキナーゼの最も重要な基質は(自身を除くと)MEK1とMEK2(英語版)キナーゼであり、これらキナーゼの活性はRafによるリン酸化に厳密に依存している。
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