Light reception of Phycomyces revisited: several white collar proteins confer blue- and red-light sensitivity and control dynamic range and adaptation
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.The fungus Phycomyces blakesleeanus exhibits phototropism, growing towards blue light. This study proposes novel roles for Wco proteins in light sensing and explains red light
Area Of Science
- Mycology
- Photobiology
- Molecular Biology
Background
- Phycomyces blakesleeanus exhibits phototropism, a growth response to light.
- Blue-light photoreception is mediated by MadA and MadB, homologs of Neurospora crassa's white collar (WC) proteins.
- The roles of additional WC proteins (WcoA, WcoB) and red light's influence on phototropism are not fully understood.
Purpose Of The Study
- To elucidate the function of WcoA and WcoB in Phycomyces blakesleeanus photoreception.
- To explain the mechanism of red light's influence on blue light-mediated phototropism.
- To detail the signal transduction pathway involved in phototropism.
Main Methods
- Analysis of protein homologs and their proposed functions.
- Hypothesizing mechanisms for photoreceptor function and signal transduction.
- Investigating the role of WC complexes in generating light-sensitive radicals.
Main Results
- WcoA and/or WcoB are proposed to expand the dynamic range of photoreception.
- A neutral flavosemiquinone radical generated by WC complexes after blue-light irradiation is hypothesized to absorb red light.
- Ras-GAP (MadC) is implicated in signal transduction and photoreceptor localization for spatial orientation.
Conclusions
- WC complexes play a crucial role in Phycomyces blakesleeanus phototropism, potentially involving novel red light absorption mechanisms.
- Signal transduction involves interactions between WC receptors, small G-proteins, Ras-GAP, and Ras-GEF within specific cellular compartments.
- Further research is needed to confirm the photoreceptor properties of WcoA and WcoB and the precise mechanisms of signal transduction.
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
Related Concept Videos
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
What Is a Photoreceptor?
Plants respond to light using a unique set of light-sensitive proteins called photoreceptors. Photoreceptors contain photopigments, which consist of a protein component bound to a non-protein, light-absorbing pigment called...
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.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...