Smithsonian Magazine · People & society

Nobel Prize for Chirality Research Aids Drug Development

Two chemists, Henri Kagan and Kenso Soai, received the Nobel Prize in Chemistry for their work on molecular chirality, crucial for developing safer, more targeted medicines.

Chirality describes molecules with mirror-image forms, like hands. These forms can behave differently; for instance, one version of carvone smells like mint, another like caraway.

Life predominantly uses one chiral form (homochirality). DNA sugars are right-handed, while most protein amino acids are left-handed.

Scientists long puzzled over how nature creates this asymmetry and why life prefers specific forms, as lab experiments yielded 50-50 mixtures.

Kagan showed in 1986 that asymmetrical catalysts could produce predominantly one chiral form. This nonlinear effect means a small catalyst imbalance creates a larger molecular imbalance.

Soai developed autocatalytic reactions where the process creates its own catalyst, amplifying asymmetry. His 2003 "Soai reaction" produced a vast majority of one mirror image.

Their work provides a mechanism for chirality's origin but doesn't fully explain its natural occurrence or preferences.

This research enables drugmakers to create single-chiral-form drugs, reducing side effects from unwanted mirror images and improving therapeutic control.

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