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タンパク質キナーゼCにおける亜鉛結合部位の識別と特徴付け

S R Hubbard¹, W R Bishop, P Kirschmeier

¹Howard Hughes Medical Institute, New York, NY.

Science (New York, N.Y.)

|December 20, 1991

まとめ

タンパク質キナーゼC (PKC) は,分子あたり4個の亜鉛イオンを緊密に結合します. 拡張X線吸収微細構造 (Extended X-ray absorption fine structure,EXAFS) 分析により,これらの亜鉛イオンに対する窒素1原子と硫黄3原子の協調が明らかになった.

科学分野:

バイオケミストリーバイオケミストリー
構造生物学構造生物学とは
メタロタンパク質化学メタロタンパク質化学

背景:

タンパク質キナーゼC (PKC) は,細胞の信号伝達経路において極めて重要です.
PKCの調節領域に保存されたシステインとヒスティジンの残留物は,金属イオン結合を示唆する.
PKCにおける金属イオンの正確な役割と協調性は,依然としてほとんど特徴づけられていない.

研究の目的:

プロテインキナーゼCβI (PKCβI) の規制領域内の金属イオン協調の直接的な証拠を調査する.
PKC beta I.における結合金属イオンのステキオメトリーと調整環境を決定する.

主な方法:

ネズミのPKCββIが昆虫の細胞で過剰発現している.
PKC beta I.の浄化について
金属イオン結合をモニターするためのX線光スペクトロスコーピー.
拡張X線吸収微細構造 (EXAFS) スペクトロスコピーは,金属イオン協調を決定します.

主要な成果:

PKC beta Iは,分子あたり4個の亜鉛イオン (Zn2+) を強く結合することが判明しました.
EXAFSのデータ分析は,平均的な1つの窒素原子と3つの硫黄原子のZn2+協調環境を示した.
合理的な調整モデルは,橋渡しされていないZn2+サイトがEXAFSデータと保存されたリガンドに適合することを要求します.

結論:

直接的な証拠は,PKC beta I.に亜鉛イオン結合を確認しています.
調整環境は,PKC規制における亜鉛イオンの特定の構造的役割を示唆しています.
これらの発見は,PKC機能の構造的基礎についての洞察を提供します.

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