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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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Related Experiment Video

Updated: Dec 29, 2025

Analyzing Synaptic Modulation of Drosophila melanogaster Photoreceptors after Exposure to Prolonged Light
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Blakeslea trispora Photoreceptors: Identification and Functional Analysis.

Wei Luo1, Chao Xue2, Yuzheng Zhao3

  • 1The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, People's Republic of China wluo@jiangnan.edu.cn raozhm@jiangnan.edu.cn.

Applied and Environmental Microbiology
|February 9, 2020
PubMed
Summary

Researchers identified three photoreceptor genes (btwc-1a, -1b, and -1c) in Blakeslea trispora. These genes regulate light-induced carotenoid production and phototropism, crucial for this industrial fungus.

Keywords:
Blakeslea trisporabtwc-1light-regulated processesphotoreceptors

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Area of Science:

  • Mycology
  • Molecular Biology
  • Biochemistry

Background:

  • Blakeslea trispora is industrially significant for carotenoid production.
  • Light-regulated processes like carotenoid biosynthesis and phototropism in B. trispora are not fully understood.

Purpose of the Study:

  • To isolate and characterize photoreceptor genes in B. trispora.
  • To elucidate the function of these photoreceptors in light-dependent physiological processes.

Main Methods:

  • Bioinformatic analysis of isolated photoreceptor genes (btwc-1a, -1b, -1c).
  • Heterologous expression in Escherichia coli and photoreception analysis using HPLC and fluorescence spectrometry.
  • Site-directed mutagenesis to identify functional domains.
  • Complementation analysis in Mucor circinelloides knockout strains.

Main Results:

  • BTWC-1 proteins contain conserved PAS/LOV and zinc finger domains, homologous to known fungal blue-light regulators.
  • Purified BTWC-1 proteins showed light-responsive photocycle changes, with cysteine residues crucial for photon detection.
  • btwc-1a restored phototropism, and btwc-1c restored carotenoid biosynthesis in M. circinelloides knockout strains.

Conclusions:

  • B. trispora possesses conserved photoreceptor genes (btwc-1) involved in distinct light transduction pathways.
  • btwc-1a and btwc-1c play key roles in phototropism and light-inducible carotenogenesis, respectively.
  • This study enhances understanding of photoreception and light-regulated responses in industrial fungi like B. trispora.