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Related Concept Videos

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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Heterochromatin02:38

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Euchromatin01:01

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
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Related Experiment Video

Updated: Jun 14, 2025

Long-range Channelrhodopsin-assisted Circuit Mapping of Inferior Colliculus Neurons with Blue and Red-shifted Channelrhodopsins
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A structural decryption of cryptochromes.

Cristina C DeOliveira1, Brian R Crane1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY, United States.

Frontiers in Chemistry
|September 2, 2024
PubMed
Summary
This summary is machine-generated.

Cryptochromes (CRYs) are versatile signaling proteins. Their diverse biological roles, from circadian rhythms to magnetoreception, stem from conserved structural domains (PHR and CCE) that enable varied molecular interactions.

Keywords:
circadian clockflavoproteinlight-sensingphotosensory receptorpost-translational modificationprotein oligomerizationredox chemistrysignal transduction

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Cryptochromes (CRYs) are signaling proteins evolutionarily linked to DNA photolyases.
  • CRYs are involved in crucial biological processes including growth, metabolism, circadian rhythms, and magnetoreception.
  • CRYs possess a conserved structural framework comprising a Photolyase Homology Region (PHR) and a Cryptochrome C-terminal Extension (CCE).

Purpose of the Study:

  • To review the evolutionary relationships and functional diversity of cryptochromes.
  • To elucidate how cryptochrome molecular structures underpin their wide-ranging biological activities.
  • To explore the structural basis of cryptochrome signaling mechanisms.

Main Methods:

  • Structural analysis of cryptochrome proteins.
  • Comparative review of cryptochrome evolutionary relationships.
  • Examination of conserved and divergent structural features.

Main Results:

  • The core CRY structure, featuring the PHR and CCE domains, dictates biological activity.
  • The PHR binds essential cofactors like FAD and mediates interactions, while the CCE confers functional specificity.
  • Structural pockets within the PHR and CCE collaborate to tune molecular recognition and signal transduction.
  • Oligomerization and post-translational modifications modulate CRY activity and downstream signaling.

Conclusions:

  • Cryptochrome functional diversity arises from conserved structural elements elaborated with specific features.
  • Understanding cryptochrome structure provides insights into their roles in diverse sensory responses.
  • The structural basis for cryptochrome action highlights their significance as versatile signaling proteins.