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Related Concept Videos

Structural Isomerism02:34

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
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Simple Trusses

A truss is a structural framework consisting of slender members connected at joints, designed to support external loads while minimizing material usage and weight. Simple trusses are a type of planar truss where all members lie within a single two-dimensional plane.
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EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
Indeterminate Structure01:18

Indeterminate Structure

Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and some...
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Structure-Activity Relationships and Drug Design

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A Protocol for Computer-Based Protein Structure and Function Prediction
16:41

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Published on: November 3, 2011

Structural basis of integrin activation by talin.

Kate L Wegener1, Anthony W Partridge, Jaewon Han

  • 1Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, England, UK.

Cell
|January 16, 2007
PubMed
Summary

Talin binding to integrin tails activates them, crucial for development and disease. Researchers identified specific talin-integrin contacts required for this activation, enabling potential new therapies.

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Area of Science:

  • Cell biology
  • Structural biology
  • Biochemistry

Background:

  • Integrin activation is vital for multicellular organism development and disease processes.
  • While talin activates integrins through its phosphotyrosine-binding (PTB) domain, other PTB-domain proteins bind integrins without activation.

Purpose of the Study:

  • To define the structural basis of talin-mediated integrin activation.
  • To identify specific molecular interactions between talin and integrin beta3 required for activation.
  • To engineer talin and integrin variants for therapeutic and research applications.

Main Methods:

  • X-ray crystallography to determine the structure of the talin PTB domain bound to the integrin beta3 cytoplasmic domain.
  • Structure-based mutagenesis to create and analyze talin and integrin beta3 variants.
  • Biochemical assays to assess protein-protein interactions and integrin activation.

Main Results:

  • The study defined the high-resolution structure of the talin-integrin beta3 complex.
  • Specific contact points between talin and the integrin tail essential for activation were identified.
  • Engineered talin and beta3 variants competed with endogenous proteins, inhibiting integrin activation.

Conclusions:

  • The structural insights reveal the unique mechanism by which talin activates integrins.
  • The identified interaction site offers a potential target for developing therapeutics that block integrin activation.
  • This work enables the engineering of cells with altered integrin activation for research purposes.