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Related Concept Videos

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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ATP and Macromolecule Synthesis01:28

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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SN1 Reaction: Stereochemistry02:15

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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
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Related Experiment Video

Updated: May 7, 2026

Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Defining Substrate Specificities for Lipase and Phospholipase Candidates

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SRChing for the substrates of Src.

A B Reynolds1, S B Kanner2, A H Bouton3

  • 1Department of Cancer Biology, Vanderbilt University, Nashville, TN, USA.

Oncogene
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PubMed
Summary
This summary is machine-generated.

Identifying oncogenic Src substrates using phosphotyrosine-specific antibodies revealed key proteins like p125FAK. This research significantly impacted cancer biology and substrate identification methods.

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Area of Science:

  • Oncogenic signaling and molecular biology.
  • Protein tyrosine kinase pathways.

Background:

  • The transforming activity of oncogenic Src is linked to its tyrosine kinase domain.
  • Identifying downstream substrates is crucial for understanding cancer transformation pathways.

Purpose of the Study:

  • To review the identification and characterization of Src protein substrates.
  • To reflect on the methodology and challenges in substrate discovery.
  • To highlight the broad biological impact of identified substrates.

Main Methods:

  • Utilized phosphotyrosine-specific antibodies.
  • Employed a shotgun-based approach for substrate identification.
  • Involved cDNA cloning and functional characterization of identified proteins.

Main Results:

  • Successfully identified and characterized numerous Src substrates, including p125FAK, p130Cas, and others.
  • The identified substrates have had a profound impact across various biological fields.
  • The project's original goals evolved due to the broader significance of the findings.

Conclusions:

  • The identification of Src substrates has been pivotal in advancing cancer research.
  • The methods developed have broad applicability in identifying signaling pathway components.
  • Further research continues to explore the roles of these substrates in diverse biological processes.