Decrypting cryptochrome: revealing the molecular identity of the photoactivation reaction.
Decrypting cryptochrome: revealing the molecular identity of the photoactivation reaction.
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DOI:
10.1021/ja3074819
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发表时间:
2012-10-31
影响因子:
15
通讯作者:
Schulten K
中科院分区:
文献类型:
--
作者:
Solov'yov IA;Domratcheva T;Moughal Shahi AR;Schulten K
Migrating birds fly thousand miles and more, often without visual cues and in treacherous winds, yet keep direction. They employ for this purpose, apparently, as a powerful navigational tool the photoreceptor protein cryptochrome to sense the geomagnetic field. The unique biological function of cryptochrome supposedly arises from a photoactivation reaction involving radical pair formation through electron transfer. Radical pairs, indeed, can act as a magnetic compass; however, the cryptochrome photo-reaction pathway is not fully resolved yet. To reveal this pathway and underlying photochemical mechanisms we carried out a combination of quantum chemical calculations and molecular dynamics simulations on plant (Arabidopsis thaliana) cryptochrome. The results demonstrate that after photoexcitation a radical pair forms becomes stabilized through proton transfer, and decays back to the protein’s resting state on timescales allowing the protein, in principle, to act as a radical pair-based magnetic sensor. We briefly relate our findings on Arabidopsis thaliana cryptochrome to photo-reaction pathways in animal cryptochromes.
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