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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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Assaying the Kinase Activity of LRRK2 in vitro
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Kinase Mobility Shift Assay (KiMSA) for Assessing Protein Kinase A Activity.

Analia G Novero1, Tomás J Steeman1, Catalina Curcio1

  • 1Cell Signal Transduction Networks Laboratory, IBR (CONICET-UNR), Rosario, Argentina.

Bio-Protocol
|July 14, 2025
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Summary
This summary is machine-generated.

A new non-radioactive kinase mobility shift assay (KiMSA) offers a sensitive and safe method for measuring cAMP-dependent protein kinase (PKA) activity. This assay is valuable for studying PKA in sperm capacitation and cAMP signaling pathways.

Keywords:
FertilityFluorescence assayGel electrophoresisKemptide kinase activityKinase assayNon-radioactive assayPhosphorylationProtein kinase A (PKA)Sperm capacitationcAMP

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Reproductive Biology

Background:

  • cAMP-dependent protein kinase (PKA) is crucial for intracellular signaling and sperm capacitation.
  • Traditional PKA assays use radioactive [γ-32P] ATP and Kemptide, posing cost and safety concerns.
  • There is a need for safer, more accessible methods to quantify PKA activity.

Purpose of the Study:

  • To develop and validate a non-radioactive assay, KiMSA, for quantifying PKA activity.
  • To demonstrate KiMSA's utility in various biological contexts, including sperm capacitation and drug inhibition studies.
  • To establish KiMSA as a versatile tool for studying cAMP/PKA pathways.

Main Methods:

  • Development of KiMSA using a fluorescently labeled Kemptide substrate (Kemptide-FITC).
  • Separation and quantification of phosphorylated Kemptide-FITC via agarose gel electrophoresis and fluorescence densitometry.
  • Application of KiMSA to isolated PKA, cell extracts, and live sperm cells.

Main Results:

  • KiMSA successfully quantifies PKA activity in isolated enzyme and cell extracts.
  • The assay effectively monitors PKA activity during mouse sperm capacitation.
  • KiMSA allows for the assessment of PKA inhibition by pharmacological agents in live cells.
  • The method also enables measurement of cAMP concentrations.

Conclusions:

  • KiMSA is a sensitive, versatile, and non-radioactive alternative for measuring PKA activity.
  • This assay facilitates the study of PKA in sperm physiology and cAMP signaling.
  • KiMSA offers a safer and potentially more cost-effective approach compared to traditional radioactive methods.