Levinthal Paradox

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Cyrus Levinthal (1969) menghitung: protein dengan 100 asam amino memiliki ~3¹⁰⁰ kemungkinan konformasi. Jika dicoba satu per satu secara acak (bahkan dengan 10¹³ percobaan per detik), pencarian membutuhkan waktu 10⁷⁷ tahun. Namun protein melipat dalam 10⁻³ sampai 10⁻⁶ detik.

Resolusi: protein tidak mencari secara acak — evolusi membentuk energy funnel landscape yang mengarahkan pelipatan melalui jalur yang disukai secara energetik. AlphaFold (DeepMind, 2020) menggunakan prinsip ini untuk memprediksi struktur protein dari sekuens — salah satu terobosan terbesar dalam biologi struktural. Paradoks Levinthal mendorong pemahaman modern tentang termodinamika dan kinetika pelipatan protein.

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