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Magnetic sensitivity of cryptochrome 4 from a migratory songbird
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Magnetic sensitivity of cryptochrome 4 from a migratory songbird
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Magnetic sensitivity of cryptochrome 4 from a migratory songbird
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Journal Article
Magnetic sensitivity of cryptochrome 4 from a migratory songbird
2021
Overview
Night-migratory songbirds are remarkably proficient navigators
1
. Flying alone and often over great distances, they use various directional cues including, crucially, a light-dependent magnetic compass
2
,
3
. The mechanism of this compass has been suggested to rely on the quantum spin dynamics of photoinduced radical pairs in cryptochrome flavoproteins located in the retinas of the birds
4
–
7
. Here we show that the photochemistry of cryptochrome 4 (CRY4) from the night-migratory European robin (
Erithacus rubecula
) is magnetically sensitive in vitro, and more so than CRY4 from two non-migratory bird species, chicken (
Gallus gallus
) and pigeon (
Columba livia
). Site-specific mutations of
Er
CRY4 reveal the roles of four successive flavin–tryptophan radical pairs in generating magnetic field effects and in stabilizing potential signalling states in a way that could enable sensing and signalling functions to be independently optimized in night-migratory birds.
Cryptochrome 4 from the night-migratory European robin displays magnetically sensitive photochemistry in vitro, in which four successive flavin–tryptophan radical pairs generate magnetic-field effects and stabilize potential signalling states.
