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Related Concept Videos

Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

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Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
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Assembly of Signaling Complexes01:30

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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.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

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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...
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Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

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Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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Diversity in Cell Signaling Responses01:22

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The physiological function of a cell and cellular communication are outcomes of a range of extrinsic signals, intracellular signaling pathways, and cellular responses. No two cell types express the same repertoire of signaling components. Receptors are highly selective for their cognate ligands, but once activated, they can alter multiple cellular processes such as DNA transcription, protein synthesis, and metabolic activity. 
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Intracellular Signaling Cascades01:24

Intracellular Signaling Cascades

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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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Related Experiment Video

Updated: Feb 17, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Specificity in two-component signal transduction pathways.

Michael T Laub1, Mark Goulian

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. laub@mit.edu

Annual Review of Genetics
|December 14, 2007
PubMed
Summary
This summary is machine-generated.

Bacteria use two-component signal transduction systems to adapt to environments. This review explores how cells ensure specific signaling pathway activation while preventing cross-talk among numerous similar proteins.

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DNA-affinity-purified Chip DAP-chip Method to Determine Gene Targets for Bacterial Two component Regulatory Systems
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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Two-component signal transduction systems are ubiquitous in bacteria, mediating environmental sensing and adaptation.
  • These systems involve a sensor histidine kinase and a response regulator, crucial for cellular responses like gene expression.
  • Bacteria possess numerous, often highly similar, two-component systems, posing challenges for signal specificity.

Purpose of the Study:

  • To review cellular and molecular mechanisms governing the specificity of bacterial two-component signaling pathways.
  • To explore how bacteria integrate signals or diversify responses using similar signaling proteins.
  • To investigate strategies bacteria employ to prevent cross-talk and maintain pathway insulation.

Main Methods:

  • Literature review of cellular and molecular mechanisms in two-component signaling.
  • Analysis of studies investigating signal integration and response diversification.
  • Examination of research on cross-talk prevention and pathway insulation.

Main Results:

  • Specificity is achieved through various mechanisms, including domain interactions, protein localization, and regulatory feedback loops.
  • Signal integration can occur through shared components or complex network interactions.
  • Mechanisms preventing cross-talk involve precise protein recognition and compartmentalization.

Conclusions:

  • Bacterial two-component systems exhibit sophisticated strategies to ensure specific signal transduction despite high protein similarity.
  • Understanding these specificity mechanisms is key to comprehending bacterial adaptation and information processing.
  • This knowledge has implications for manipulating bacterial signaling pathways in biotechnology and medicine.