(p. B12) Sidney Altman, a molecular biologist who was awarded the Nobel Prize for Chemistry for sharing in the discovery that ribonucleic acid, or RNA, was not just a carrier of genetic information but could also be a catalyst for chemical reactions in cells — a breakthrough that paved the way for new gene therapies and treatments for viral infections — died on April 5  in Rockleigh, N.J.
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HAs seems to happen so often in science, Dr. Altman stumbled upon his discovery. “I wasn’t looking for what I found,” he said in a 2010 interview with Harry Kreisler at the Institute for International Studies at the University of California, Berkeley.
He had studied how a small RNA molecule, called transfer RNA, carries genetic code to make new proteins. Some of the code is not necessary, so an enzyme cuts it out before it is used.
Then, in 1978, Dr. Altman began studying an RNA-cutting enzyme from E. coli bacteria that was composed of an RNA molecule and a protein. He managed to separate the two pieces and test them to see how they reacted in the enzyme process. Much to his surprise, he discovered that the protein did not perform as an enzyme without the RNA molecule. He later discovered that the RNA molecule could be the catalyst, even without the protein.
The finding ran completely contrary to what at the time was established theory, which held that it was the proteins that were the catalysts in enzymes.
The discovery of what are now known as ribozymes was so radical that Dr. Altman had trouble getting it accepted.
Joel Rosenbaum, a professor of cell biology at Yale and a colleague of Dr. Altman’s, told Chemistry World magazine that when Dr. Altman first tried to get other scientists to accept his research, “the community of molecular biologists, including several at Yale working on RNA, did not want to believe the work.”
“He had a hard time obtaining invitations to speak at scientific meetings and, indeed, getting his work published,” Dr. Rosenbaum said.
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(Note: ellipsis, and bracketed year, added.)
(Note: the online version of the obituary was updated April 18, 2022, and has the same title as the print version.)