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Related Concept Videos

Activation and Inactivation of G Proteins01:22

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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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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Synaptic integration mainly includes the summation of graded potentials. Graded potentials, regardless of their type, cause subtle alterations in membrane voltage, resulting in either depolarization or hyperpolarization. These incremental changes, when combined or summed, can propel the neuron toward its threshold. Consider, for example, a membrane experiencing a +15 mV shift, causing it to depolarize from -70 mV to -55 mV. In this scenario, graded potentials govern the membrane's ability...
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Updated: Jun 3, 2025

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A shared alarmone-GTP switch underlies triggered and spontaneous persistence.

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Bacterial persisters survive antibiotics via a common molecular switch involving the alarmone guanosine tetraphosphate (ppGpp). This molecule depletes GTP, driving cells into dormancy and enabling survival across different persistence types.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Bacterial persisters are non-growing cells tolerant to antibiotics.
  • Understanding the molecular basis of persister formation is crucial for combating antibiotic resistance.
  • Existing knowledge categorizes persisters into triggered, spontaneous, and antibiotic-induced types.

Purpose of the Study:

  • To elucidate the common molecular determinants underlying different types of bacterial persistence.
  • To investigate the role of the alarmone guanosine tetraphosphate (ppGpp) in persister formation.
  • To characterize the mechanisms of triggered, spontaneous, and antibiotic-induced persistence in Gram-positive bacteria.

Main Methods:

  • Investigated persistence mechanisms in a Gram-positive bacterium.
  • Utilized a fluorescent GTP reporter to visualize single-cell GTP dynamics during persister formation.
  • Analyzed the roles of alarmone synthetases (Rel, SasB, SasA) and ppGpp in different persistence pathways.

Main Results:

  • Identified a common persistence switch mediated by ppGpp across triggered, spontaneous, and antibiotic-induced persisters.
  • Demonstrated that ppGpp accumulation depletes intracellular GTP, leading to a rapid switch from growth to dormancy.
  • Showcased distinct alarmone synthesis pathways for each persistence type, converging on ppGpp production.

Conclusions:

  • Alarmone-GTP antagonism is a conserved mechanism driving bacterial persistence and antibiotic survival.
  • ppGpp-mediated GTP depletion is essential for the switch-like dynamics leading to persister formation.
  • This mechanism is likely widespread in Gram-positive bacteria and potentially other microbial species.