Paul Boyer

Paul D. Boyer (1918–2018) was an American biochemist who shared the 1997 Nobel Prize in Chemistry with John Walker and Jens Skou for elucidating the enzymatic mechanism of ATP synthesis. Boyer's central contribution was the binding-change mechanism, which proposed that the three catalytic sites of ATP synthase cycle through distinct conformational states — loose, tight, and open — driven by rotation of the enzyme's central stalk. This hypothesis, initially controversial, was vindicated by crystallographic studies and remains the accepted framework for understanding rotational catalysis.

Boyer is a paradigmatic case of how biochemical insight advances through the interplay of mechanistic hypothesis and structural determination. His work transformed ATP synthase from a black-box catalyst into a precisely characterized rotary machine — a shift that mirrors the broader transition in systems-level biology from descriptive catalogues to mechanistic explanations. The binding-change mechanism itself has become a template for understanding conformational coupling in other enzyme families.