cryptochromes


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cryptochromes

[′krip·tə‚krōm]
(cell and molecular biology)
Light-sensitive proteins found in both plants and animals that detect and change conformation in response to blue light; in animals, they play an important role in circadian rhythm.
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Light is absorbed by plant photoreceptors including phytochromes, cryptochromes and phototropins (Muneer et al., 2014).
Though the idea has been posited in the past, now the biologists from Lund University, Sweden, and Carl von Ossietzky University Oldenburg, Germany, were able to pin down the exact molecule responsible for the action - "Cry4." It belongs to a class of proteins called cryptochromes, a group sensitive to blue light and biological sleep cycles of many animals.
Firstly CLOCK and BMAL1 bind to each other to form a heterodimer that binds with Periods (i.e., Perl, Per2 and PerS) and Cryptochromes (i.e., Cryl and Cry2) genes [20].
Terao et al., "A role for cryptochromes in sleep regulation," BMC Neuroscience, vol.
Cryptochromes are blue light receptors linked to a flavin and pterine, and responsible for mediating various plant responses, such as regulation of circadian rhythms, depolarization of membranes, anthocyanins production, and other effects (Yu, Liu, Klejnot, & Lin, 2010).
Yu et al., "Cryptochromes mediate rhythmic repression of the glucocorticoid receptor," Nature, vol.
But putative cell-level detectors such as cryptochromes have been found also in peripheral tissues and in cultured cells [12], so sensitivity to weak MFs could be an intrinsic property of living cells, which has served as the basis for the evolution of a magnetic sense in certain species and in specific organs.
Before addressing the main subject, one can concisely outline the diverse roles of cryptochromes in animals along with the track of related research.
Molecules known as cryptochromes, found within avian retinas, may be behind birds' uncanny navigational skills (SN: 5/9/09, p.
Terao et al., "A role of cryptochromes in sleep regulation," BMC Neuroscience, vol.