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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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Protein Kinases and Phosphatases02:54

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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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Oligopeptide Competition Assay for Phosphorylation Site Determination
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Phosphorylation/Dephosphorylation Assays.

Hiroshi Suzuki1

  • 1Asahikawa Medical University, 2-1-1-1, Midorigaokahigashi, Asahikawa, Hokkaido, 078-8510, Japan. hisuzuki@asahikawa-med.ac.jp.

Methods in Molecular Biology (Clifton, N.J.)
|December 24, 2015
PubMed
Summary

P-type ATPases use ATP hydrolysis for energy coupling. Analyzing these reactions in SERCA1a, a calcium pump, is key to understanding pump function and related diseases.

Keywords:
ATPATP -driven pumpsAspartyl phosphateAutoradiographyInorganic phosphateP-type ATPase sPhosphorylated intermediate sPhosphorylationSDS -PAGESERCA

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • P-type ATPases are essential membrane proteins that couple ATP hydrolysis to ion transport.
  • Autophosphorylation and subsequent hydrolysis of ATP form key intermediates in the P-type ATPase catalytic cycle.
  • Understanding these reactions is critical for elucidating pump mechanisms and the pathophysiology of diseases linked to ATPase defects.

Purpose of the Study:

  • To present methodologies for analyzing the ATP-dependent reactions of P-type ATPases.
  • To investigate the isomeric transition and hydrolysis steps within the transport cycle.
  • To apply these methods to SERCA1a, a well-characterized Ca(2+)-ATPase.

Main Methods:

  • Detailed biochemical assays to monitor ATP binding and hydrolysis.
  • Kinetic analyses to characterize intermediate states.
  • Spectroscopic techniques to probe conformational changes during the catalytic cycle.
  • Enzyme kinetics and reaction mechanism studies.

Main Results:

  • Characterization of the autophosphorylated intermediate formation and decay.
  • Quantification of ATP hydrolysis rates and associated conformational changes.
  • Elucidation of the sequence of events in the SERCA1a transport cycle.
  • Identification of rate-limiting steps in the catalytic mechanism.

Conclusions:

  • The described methods provide a robust framework for studying P-type ATPase mechanisms.
  • Detailed analysis of ATP-dependent reactions is crucial for understanding energy transduction in these pumps.
  • Insights gained from SERCA1a can be extrapolated to other P-type ATPases and related diseases.