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Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven.
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
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Conserved Binding Sites01:49

Conserved Binding Sites

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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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MAPK Signaling Cascades01:07

MAPK Signaling Cascades

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Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
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Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
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Phosphorylation01:02

Phosphorylation

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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
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Mutations01:39

Mutations

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Overview
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Pathogenic mutation hotspots in protein kinase domain structure.

Kirill E Medvedev1, R Dustin Schaeffer1, Jimin Pei2

  • 1Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Protein Science : a Publication of the Protein Society
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Protein kinase mutations drive human diseases. This study maps pathogenic mutations to protein kinase structures, revealing cancer-related hotspots in catalytic regions and a novel non-cancer hotspot in Aurora kinase A.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Eukaryotic cellular functions depend on protein phosphorylation by protein kinases.
  • Dysregulation of protein kinase signaling pathways is linked to various human diseases, including cancer and neurodegenerative disorders.

Purpose of the Study:

  • To map pathogenic mutations in human protein kinase domains.
  • To identify mutation hotspots associated with different disease types.
  • To analyze the structural location of these hotspots relative to protein kinase function.

Main Methods:

  • Utilized the ClinVar database to collect pathogenic mutations.
  • Mapped mutations from 497 human protein kinase domains to the Aurora kinase A (AURKA) reference structure.
  • Grouped mutations based on disease relevance (cancer vs. non-cancer).

Main Results:

  • Identified distinct mutation hotspots for cancer and non-cancer-related diseases.
  • Cancer-associated hotspots are predominantly located in the catalytic and activation loops of kinase domains.
  • Discovered a novel hotspot at residue R371 in AURKA, with 21 exclusively non-cancer pathogenic mutations.

Conclusions:

  • Mutation patterns differ significantly between cancer and non-cancer-related kinase dysfunction.
  • The R371 residue in AURKA represents a potential new target for understanding non-cancerous kinase-related diseases.