Jens Christian Skou

Danish physician and Nobel laureate who discovered the Na+/K+-ATPase, revealing how cells use ATP to maintain sodium and potassium gradients essential for nerve, muscle and cellular function.

Jens Christian Skou (1918–2018) was a Danish medical researcher and physician best known for discovering the enzyme now called the Na+/K+-ATPase. Trained as a medical doctor, Skou combined clinical insight with careful laboratory work to reveal a fundamental mechanism by which animal cells maintain ion gradients across their membranes. His work earned him the Nobel Prize in Chemistry in 1997.

Scientific contribution

Skou's key finding was that a membrane-bound enzyme uses the energy of ATP hydrolysis to actively transport sodium (Na+) out of cells and potassium (K+) into cells. This active transport maintains concentration differences that are essential for resting membrane potential, nerve impulse transmission, and muscle contraction. The pump's basic operation — coupling ATP hydrolysis to ion movement — became a cornerstone of cellular physiology and helped explain how cells perform work at the molecular level.

Context and significance

The Na+/K+-ATPase is now recognized as critical to many physiological processes. By exporting Na+ and importing K+, the pump contributes to osmotic balance, secondary active transport of nutrients and ions, and the electrical excitability of neurons and myocytes. The enzyme is also the target of certain drugs and toxins; for example, cardiac glycosides influence heart contractility by interacting with the pump. Skou's discovery therefore bridged basic biochemistry and clinical relevance.

Career and recognition

Skou carried out much of his research in Denmark and was associated with institutions in Aarhus, where he spent later years of his career and life. His Nobel Prize in 1997 was shared with Paul D. Boyer and John E. Walker for complementary discoveries about how cells use chemical energy; Paul D. Boyer was cited for work on ATP synthase, while Skou was singled out for the ion pump. The award highlighted how mechanisms of energy use and ion transport underlie diverse biological functions.

Legacy

Skou's contribution transformed the understanding of membrane physiology and remains central to textbooks and research. His findings helped open fields such as membrane transport, electrophysiology, and pharmacology. He died in May 2018 in Aarhus, Denmark, at age 99, leaving a lasting legacy in both basic science and medicine.

Major discovery: Na+/K+-ATPase, an ATP-driven ion pump.
Impact: foundational role in nerve and muscle physiology.
Recognition: Nobel Prize in Chemistry, 1997.