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Related Concept Videos

Three Developmental Domains01:29

Three Developmental Domains

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Human development is typically examined across three main domains: physical, cognitive, and socio-emotional. These domains represent the significant areas of change and continuity throughout the lifespan, from infancy to late adulthood.
Physical Development
Physical processes, also known as maturation, encompass the biological changes that occur across an individual's life. These changes begin with genetic inheritance and continue through various stages, including growth in height and weight,...
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Three-Domain System of Life01:21

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Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...
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Conservation of Protein Domains Over Different Proteins02:26

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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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Membrane Domains01:18

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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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No description available
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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Related Experiment Video

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Polyelectrolyte Complex for Heparin Binding Domain Osteogenic Growth Factor Delivery
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The PDZ domain as a complex adaptive system.

Alexei Kurakin1, Andrzej Swistowski, Susan C Wu

  • 1The Buck Institute for Age Research, Novato, California, USA. ak@alexeikurakin.org

Plos One
|September 27, 2007
PubMed
Summary

PDZ domains balance specificity and promiscuity, acting as complex adaptive systems. This balance is crucial for cellular organization and plasticity in structures like synapses.

Area of Science:

  • Molecular Biology
  • Systems Biology
  • Biophysics

Background:

  • Protein interactions form cellular networks, with PDZ domains mediating specific peptide recognition.
  • Understanding the selectivity-promiscuity relationship in PDZ domain interactions is key to cell function.

Purpose of the Study:

  • Investigate the mechanistic basis of selectivity and promiscuity in PDZ domain interactions.
  • Characterize PDZ domain ligand specificity determinants and their functional implications.

Main Methods:

  • Generated artificial and natural peptide ligands for archetypal PDZ domains (PSD95, SAP97) using target-assisted iterative screening and proteomic fragment synthesis.
  • Performed comparative statistical analysis of affinity-ranked ligands.

Main Results:

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  • Identified known and novel specificity determinants for PDZ domain recognition.
  • Revealed inherent adaptive plasticity in PDZ domain recognition, balancing specificity and promiscuity.

Conclusions:

  • Reconceptualized PDZ domains as complex adaptive systems, mediating both structural order and plasticity.
  • This adaptive system model applies to higher-order sub-cellular organizations like synapses and cell junctions.