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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Frequency-Domain Interpretation of PD Control01:24

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Proportional-Derivative (PD) controllers are widely used in fan control systems to improve stability and performance. A fan control system can be effectively represented using a Bode plot to illustrate the impact of a PD controller through its transfer function. The Bode plot visually conveys how PD control modifies the fan's response across various frequencies, providing a frequency domain interpretation of the controller's behavior.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Time-Domain Interpretation of PD Control01:07

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Related Experiment Video

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Mapping Dysfunctional Protein-Protein Interactions in Disease
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Published on: October 24, 2025

PDZ domain from Dishevelled -- a specificity study.

Katarzyna Śmietana1, Agnieszka Mateja, Artur Krężel

  • 1Faculty of Biotechnology, Department of Protein Engineering, University of Wrocław, Wrocław, Poland.

Acta Biochimica Polonica
|June 14, 2011
PubMed
Summary

Dishevelled proteins regulate Wnt signaling. Researchers found the Dishevelled-2 PDZ domain binds its own nuclear export signal, potentially controlling Wnt pathway activation.

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In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
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Published on: August 13, 2012

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Developmental Biology

Background:

  • Wnt proteins are crucial for development and cancer, utilizing diverse intracellular signaling cascades.
  • Dishevelled proteins are key regulators of Wnt signaling pathways, but their interaction mechanisms are not fully understood.
  • The precise control over which Wnt response mechanism is activated remains unclear.

Purpose of the Study:

  • To investigate the binding specificity of the human Dishevelled-2 PDZ domain.
  • To elucidate the molecular mechanisms underlying Dishevelled protein interactions.
  • To explore how Dishevelled protein localization impacts Wnt signaling pathway selection.

Main Methods:

  • C-terminal phage display was employed to identify binding partners of the Dishevelled-2 PDZ domain.
  • Fluorescence spectroscopy, mutational analysis, and immunoenzymatic assays were used to characterize PDZ domain interactions.
  • Specific focus was placed on interactions with peptide and protein motifs, including the nuclear export signal (NES) of Dishevelled-2.

Main Results:

  • A leucine-rich binding motif, similar to a nuclear export signal (NES), was identified for the Dishevelled-2 PDZ domain.
  • Experimental validation confirmed that the Dishevelled-2 PDZ domain directly binds to the Dishevelled-2 NES.
  • This intramolecular interaction suggests a mechanism for modulating Dishevelled protein's intracellular localization.

Conclusions:

  • The interaction between the Dishevelled-2 PDZ domain and its NES may regulate the balance of Dishevelled protein between the nucleus and cytoplasm.
  • This regulatory mechanism is proposed to be critical for the differential activation of Wnt signaling cascades.
  • The findings suggest a novel way to selectively promote nucleus-dependent Wnt/β-catenin signaling over non-canonical Wnt pathways.