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Abb26.7

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Abb26.7

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  1. Abb. 26.7 Die Kinasen p38α und p38β besitzen als Türsteherrest ein Threonin (Thr 106, violett), in den strukturähnlichen p38γ- und p38δ-Kinasen liegt dort ein sterisch anspruchsvolleres Methionin vor. SB 203580 26.3 bindet mit seinem p-Fluorphenylrest am zentralen Imidazolring in eine kleine Nische neben dem Threonin (grüne Oberfläche, Innenseite blau). Gegen die anderen Kinasen mit einer voluminöseren Aminosäure in dieser Position (Met, Gln) bricht wegen sterischer Konflikte die Wirkung ein.

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