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Related Concept Videos

Introduction to Special Senses01:26

Introduction to Special Senses

Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive functions.
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
cAMP-dependent Protein Kinase Pathways01:25

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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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Sensory Modalities

Sensation typically is the process by which the sensory receptors and sense organs detect stimuli from the internal and external environment and transmit this information to the central nervous system for processing.
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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...

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Imaging G-protein Coupled Receptor (GPCR)-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum
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Sensing, presenting, and regulating PAMPs.

J L de Diego1, G Gerold, A Zychlinsky

  • 1Department for Cellular Microbiology, Max Planck Institute for Infection Biology, 10117 Berlin, Germany. diego@mpiib-berlin.mpg.de

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Toll-like receptors (TLRs) detect microbial invaders, initiating immune responses. This review explores how microbial ligand availability influences TLR recognition, aiding understanding of innate immunity against pathogens.

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Area of Science:

  • Immunology
  • Microbiology
  • Molecular Biology

Background:

  • Innate immunity relies on pattern recognition receptors like Toll-like receptors (TLRs) to detect microbial infections.
  • TLRs are crucial for initiating immune responses against pathogens, coordinating defense, and bridging to adaptive immunity.
  • While TLR signaling is well-studied, the precise molecular mechanisms of microbial recognition by TLRs remain incompletely understood.

Purpose of the Study:

  • To review the role of microbial ligand availability in regulating TLR-mediated recognition.
  • To enhance understanding of the molecular basis of how TLRs identify and respond to microbial threats.
  • To consolidate current knowledge on TLRs' interaction with microbial components.

Main Methods:

  • Literature review focusing on studies investigating microbial ligand presentation to TLRs.
  • Analysis of molecular mechanisms governing the interaction between microbial components and TLRs.
  • Synthesis of findings related to the impact of ligand availability on immune activation.

Main Results:

  • Microbial ligand availability and presentation are critical factors influencing TLR activation thresholds.
  • The physical state and accessibility of microbial ligands significantly impact the specificity and efficacy of TLR recognition.
  • Understanding ligand dynamics provides insights into the fine-tuning of innate immune responses.

Conclusions:

  • The availability and presentation of microbial ligands are key determinants in TLR-mediated recognition of pathogens.
  • Further research into ligand-receptor interactions will refine our understanding of innate immune sensing.
  • This knowledge is vital for developing novel therapeutic strategies targeting microbial infections.