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Spare Receptors01:30

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Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...
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Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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SERKing Coreceptors for Receptors.

Xiyu Ma1, Guangyuan Xu2, Ping He3

  • 1Institute for Plant Genomics & Biotechnology, Texas A&M University, College Station, TX 77843, USA; Department of Biochemistry & Biophysics, Texas A&M University, College Station, TX 77843, USA.

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Summary

Somatic embryogenesis receptor kinases (SERKs) act as crucial coreceptors in plant signaling pathways. These receptor-like kinases (RLKs) integrate diverse signals, ensuring specific cellular responses in growth, differentiation, and immunity.

Keywords:
plant growth and developmentplant immunityreceptor-like kinases (RLKs)receptor-like proteins (RLPs)somatic embryogenesis receptor kinases (SERKs)

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Area of Science:

  • Plant molecular biology
  • Cell signaling
  • Plant development

Background:

  • Plants utilize numerous cell surface receptor-like kinases (RLKs) and receptor-like proteins (RLPs) to perceive external and internal cues.
  • Signaling pathways initiated by RLKs and RLPs converge on a conserved set of RLKs known as somatic embryogenesis receptor kinases (SERKs).

Purpose of the Study:

  • To review recent discoveries regarding SERK functions in plant cell differentiation, growth, and immunity.
  • To elucidate the regulatory and activation mechanisms of SERK-associated receptor complexes.
  • To understand how SERKs maintain signaling specificity despite their role as convergent hubs.

Main Methods:

  • Literature review of recent advances in SERK research.
  • Analysis of signaling pathways involving RLKs, RLPs, and SERKs.
  • Discussion of ligand-induced heterodimerization and transphosphorylation mechanisms.

Main Results:

  • SERKs function as shared coreceptors in various signaling pathways, demonstrating functional plasticity.
  • Newly identified SERK functions impact plant cell differentiation, growth, and immunity.
  • SERKs are critical for maintaining signaling specificity within complex plant signaling networks.

Conclusions:

  • SERKs play a pivotal role as convergent hubs in plant signaling, integrating diverse inputs.
  • Understanding SERK regulation and activation is key to deciphering plant cellular responses.
  • SERKs are essential for precise control over plant development and defense mechanisms.