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Related Concept Videos

Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

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,...
Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
Another mechanism for membrane domain formation involves membrane proteins interacting with cytoskeletal...
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.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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Intrinsically Disordered Proteins02:18

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Plakins are large proteins with binding domains for microtubules, microfilaments, intermediate filaments, and membrane-associated protein complexes at cell junctions. Plakin functions are evolutionarily conserved and are primarily involved in organizing the different components of the cytoskeleton by crosslinking them to each other and connecting them to the cell-matrix and cell adhesion complexes. They are also known to interact with signal transducers, serve as scaffolds for signaling...

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Related Experiment Video

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In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes
10:05

In Vitro Analysis of PDZ-dependent CFTR Macromolecular Signaling Complexes

Published on: August 13, 2012

Extensions of PDZ domains as important structural and functional elements.

Conan K Wang1, Lifeng Pan, Jia Chen

  • 1Department of Biochemistry, Molecular Neuroscience Center, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Protein & Cell
|January 5, 2011
PubMed
Summary

Researchers discovered protein domain extensions that significantly impact protein structure and function. These extensions, particularly in PDZ domains, offer new insights into protein interactions and dynamics.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Bioinformatics

Background:

  • Proteins are traditionally studied by dividing them into domains with canonical structures.
  • However, regions outside these canonical definitions, termed 'extensions,' can influence protein behavior.

Purpose of the Study:

  • To investigate the existence and functional significance of domain extensions.
  • To focus on the abundant PDZ (PSD-95, DLG1 and ZO-1) domain and its extensions.

Main Methods:

  • Bioinformatic analysis to identify potential extensions in PDZ domains.
  • Development of an openly accessible website (http://bcz102.ust.hk/pdzex/) to present findings.

Main Results:

  • Identification of numerous PDZ domains with potential extensions.
  • Classification of PDZ extension roles into four categories: modulating binding affinity, enabling macromolecular assembly, integrating multi-domain modules, and expanding ligand-binding pockets.

Conclusions:

  • Protein domain extensions play crucial roles in protein structure and function.
  • Future research should consider these extensions beyond canonical domain boundaries for a comprehensive understanding.