Three biophysicists win 2017 Nobel Prize in chemistry for imaging molecules of life - World Big News

Three biophysicists win 2017 Nobel Prize in chemistry for imaging molecules of life

In Science

Jacques Dubochet, Joachim Frank and Richard Henderson have won the Nobel Prize in chemistry “for developing cryo-electron microscopy for the high-resolution structure determination of biomolecules in solution,” the Nobel committee announced Wednesday.

Cryo-electron microscopy is “a cool method for imaging the materials of life,” said Nobel committee member Göran K. Hansson from Stockholm. The development allows scientists to visualize proteins and other biological molecules at the atomic level.

Dubochet, a Swiss citizen, is a professor at the University of Lausanne in Switzerland. Joachim Frank, born in Germany, is a Columbia University professor in New York. Richard Henderson, of Scotland, works at Cambridge University in Britain.

To see the structure of molecules at ultrahigh resolution, scientists must hold molecules in place in their natural configuration. Other microscopic techniques, such as X-ray crystallography, are far more rigid than cryo-electron microscopy. Stockholm University biochemist Peter Brzezinski said on Wednesday that the future of cryo-electron imaging will not be simply taking still images but those of moving molecules, creating movies that illuminate a world in motion on the atomic scale.

“Cryo-electron microscopy is about to completely transform structural biology,” said Frank, by phone to the Nobel conference, who had been woken by the committee’s telephone call Wednesday morning.

The technique flash-freezes a sample to create a layer of ice like a pane of glass over a layer of liquid where the molecules can retain their natural shape.

Ice crystals distort microscopic images. In the 1980s, Dubochet figured out how to cool water so quickly that crystals would not form. But when he first submitted the finding for publication, it was rejected — the publishers did not believe water could be manipulated this way.

“No miracle was involved, not even fundamental discoveries; the progress came from a large numbers of incremental improvements affecting all the various steps of the specimen preparation protocol,” wrote Dubochet in 2011. During 25 years of labor, the biophysicist wrote, “a good dozen dedicated colleagues, mostly doctoral students” worked to refine the microscopic technique.

Frank created three-dimensional pictures from electron microscopes’ two-dimensional images. For him, he said, the “coolest molecule has always been the ribosome.” The ribosome, a cluster of RNA and protein, is tiny and hard to image. Its width is less than the wavelength of visible light. Cryo-electron microscopy allowed Frank and his colleagues to view the camera-shy particle.

In the 1990s, Henderson showed that cryo-electron microscopy could be as detailed as X-ray crystallography when he made an atomic model of a membrane protein found in microorganisms.

Scientists used cryo-electron imaging to quickly determine the shape of the Zika virus once it was identified as the cause of severe birth defects. Knowing the shape of a virus can speed up research into vaccines.

This years winners of science Nobel Prizes (in physiology or medicine, physics, and now chemistry) include seven Americans. Asked after the announcement why the U.S. has produced so much Nobel-winning work over the years, Hansson pointed out that since World War II, the U.S. has invested heavily in science and has “allowed scientists to perform fundamental research to focus on important questions of science, without forcing them to have immediate applications and not controlling them in a political way.”

The Royal Swedish Academy of Sciences has awarded 109 prizes in chemistry. Jacobus Henricus van ‘t Hoff, a pioneer in physical chemistry, won the inaugural award in 1901. Last year, the Nobel committee recognized three chemists who created truly micro machines: engines just a few molecules in size. The researchers defeated molecular equilibrium to design shapes that, like microscopic wheels, move on command.

For this year’s award, some Nobel prognosticators gave the nod to John B. Goodenough, 94, inventor of the lithium-ion battery. Gene-editing system CRISPR-Cas9, too, has been an oft-cited contender during the Nobel award season.

Microbes evolved CRISPR to defend against viruses. Scientists have wielded CRISPR as a tool to shape organisms’ genes, demonstrating what a few researchers say is its Nobel-worthy potential. In one recent study, biologists grew butterflies with strange new wing colors. Others created the first mutant ants. Geneticists implanted a black-and-white movie in E. coli bacteria, using CRISPR to store pixels as DNA snippets.

But contention over who should get primary credit for the work — a patent dispute that pits MIT and Harvard’s Broad Institute against the University of California at Berkeley — may be keeping CRISPR from being awarded a Nobel, bound as the committee is by its rule that only three winners can share the prize.

The Nobel Prize in literature will be announced on Thursday, followed by the peace prize on Friday. An award in economics, not one of the original prizes but now conducted in memory of Alfred Nobel, will be announced Monday.

This article has been updated.

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