The story of PKC: A discovery marked by unexpected twists and turns

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Signaling

Background:

• Protein kinase C (PKC) plays a vital role in cellular signal transduction pathways.
• PKC activation is linked to the hydrolysis of membrane inositol phospholipids and acts as a receptor for phorbol esters.

Purpose of the Study:

• To provide a historical perspective on the discovery and characterization of Protein Kinase C (PKC).
• To contextualize the enzyme family's emergence within the broader progress of protein phosphorylation research.

Main Methods:

• Review of historical scientific literature and initial experimental findings.
• Analysis of the indirect discovery process of PKC, highlighting unexpected findings.

Main Results:

• PKC was not initially identified through screening for 1,2-diacylglycerol-dependent enzymes or by its phorbol ester binding properties.
• The characterization of PKC, now recognized as a multi-isoform family, resulted from a complex and indirect scientific journey.

Conclusions:

• The discovery of PKC exemplifies the often non-linear progression of scientific research.
• Understanding the historical context of PKC discovery provides insight into the evolution of protein phosphorylation studies.