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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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Correction: Novel frequenin-modulated Ca2<sup>+</sup>-signaling membrane guanylate cyclase (ROS-GC) transduction pathway in bovine hippocampus.

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Multilimbed membrane guanylate cyclase signaling system, evolutionary ladder.

Teresa Duda1, Rameshwar K Sharma1

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The membrane guanylate cyclase (mGC) system, crucial for cell biology, generates cyclic GMP to regulate vital physiological functions. Its complex, multi-limbed structure and diverse signaling pathways are key to its broad impact.

Keywords:
calciumcarbon dioxidecardiovascularcyclic GMP signaling pathwaysmembrane guanylate cyclasesensory neuronssurface receptorstransduction modes

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry
  • Physiology

Background:

  • The membrane guanylate cyclase (mGC) signal transduction system is a pivotal discovery in cell biology.
  • Its molecular, biochemical, and genetic features have revolutionized therapeutic development for endocrine, cardiovascular, and sensory neuron diseases.
  • The system's role extends to environmental factors like atmospheric carbon dioxide.

Purpose of the Study:

  • To provide a historical account of the evolutionary development of the mGC system.
  • To describe the structural components and interaction mechanisms of mGC.
  • To elucidate the complexity and diverse functions of the cyclic GMP signaling pathway.

Main Methods:

  • Review of historical scientific literature and foundational discoveries.
  • Analysis of the structural components and modular design of mGC.
  • Examination of signaling pathways including ACTH, ATP binding, Ca2+-sensor proteins, and environmental modulations.

Main Results:

  • The mGC system operates independently of soluble guanylate cyclases and utilizes a one-component transduction system.
  • mGC possesses a multi-limbed structure with at least six distinct signaling pathways.
  • These pathways include ACTH modulation, ATP binding/phosphorylation, Ca2+-sensor proteins (GCAP1, S100B), and responses to CO2 and temperature.

Conclusions:

  • The mGC system's complex structure and diverse signaling mechanisms enable its critical roles in regulating cardiovascular, sensory neuron, and endocrine functions.
  • Understanding mGC's evolution and function is essential for developing targeted therapies.
  • The system's interaction with environmental factors highlights its broad physiological significance.