Christie's says the gold medal won by James Watson was purchased Thursday by a buyer who wished to remain anonymous. The New York City auction house says it's the first Nobel medal to be offered at auction by a living recipient.
Watson made the 1953 discovery with Francis Crick and Maurice Wilkins.
He says part of the proceeds will go to the University of Chicago, Clare College Cambridge, Cold Spring Harbor Laboratory, Long Island Land Trust and other charities.
Crick's Nobel prize sold last year at Heritage Auctions for $2.2 million. He died in 2004.