Skip Ribbon Commands Skip to main content
 

 Global - Sci - Tech - News - Content

 
​Scientists unravel mystery of photosynthesis Update: 10-02-2020
Scientists have solved a critical part of the mystery of photosynthesis, focusing on the initial, ultrafast events through which photosynthetic proteins capture light and use it to initiate a series of electron transfer reactions.

Date: February 5, 2020

Source: DOE/Argonne National Laboratory

Summary:


Sunlight and leaves (stock image). Credit: © Elena Volkova / 
Adobe Stock

Plants have been harnessing the sun's energy for hundreds of millions of years. Algae and photosynthetic bacteria have been doing the same for even longer, all with remarkable efficiency and resiliency.

It's no wonder, then, that scientists have long sought to understand exactly how they do this, hoping to use this knowledge to improve human-made devices such as solar panels and sensors.

Scientists from the U.S. Department of Energy's (DOE) Argonne National Laboratory, working closely with collaborators at Washington University in St. Louis, recently solved a critical part of this age-old mystery, homing in on the initial, ultrafast events through which photosynthetic proteins capture light and use it to initiate a series of electron transfer reactions.

"In order to understand how biology fuels all of its engrained activities, you must understand electron transfer," said Argonne biophysicist Philip Laible. "The movement of electrons is crucial: it's how work is accomplished inside a cell."

In photosynthetic organisms, these processes begin with the absorption of a photon of light by pigments localized in proteins.

Each photon propels an electron across a membrane located inside specialized compartments within the cell.

"The separation of charge across a membrane -- and stabilization of it -- is critical as it generates energy that fuels cell growth," said Argonne biochemist Deborah Hanson.

The Argonne and Washington University research team has gained valuable insight on the initial steps in this process: the electron's journey.

Nearly 35 years ago, when the first structure of these types of complexes was unveiled, scientists were surprised to discover that after the absorption of light, the electron transfer processes faced a dilemma: there are two possible pathways for the electron to travel.

In nature, plants, algae and photosynthetic bacteria use just one of them -- and scientists had no idea why. What they did know was that the propulsion of the electron across the membrane -- effectively harvesting the energy of the photon -- required multiple steps. Argonne and Washington University scientists have managed to interfere with each one of them to change the electron's trajectory.

"We've been on this trail for more than three decades, and it is a great accomplishment that opens up many opportunities," said Dewey Holten, a chemist at Washington University.

The scientists' recent article, "Switching sides -- Reengineered primary charge separation in the bacterial photosynthetic reaction center," published in the Proceedings of the National Academy of Sciences, shows how they discovered an engineered version of this protein complex that switched the utilization of the pathways, enabling the one that was inactive while disabling the other.

"It is remarkable that we have managed to switch the direction of initial electron transfer," said Christine Kirmaier, Washington University chemist and project leader. "In nature, the electron chose one path 100 percent of the time. But through our efforts, we have been able to make the electron switch to an alternate path 90 percent of the time. These discoveries pose exciting questions for future research."

As a result of their efforts, the scientists are now closer than ever to being able to design electron transfer systems in which they can send an electron down a pathway of their choosing.

"This is important because we are gaining the ability to harness the flow of energy to understand design principles that will lead to new applications of abiotic systems," Laible said. "This would allow us to greatly improve the efficiency of many solar-powered devices, potentially making them far smaller. We have a tremendous opportunity here to open up completely new disciplines of light-driven biochemical reactions, ones that haven't been envisioned by nature. If we can do that, that's huge."

Story Source:

Materials provided by DOE/Argonne National Laboratory. Original written by Jo Napolitano. Note: Content may be edited for style and length.

Journal Reference:

1.    Philip D. Laible, Deborah K. Hanson, James C. Buhrmaster, Gregory A. Tira, Kaitlyn M. Faries, Dewey Holten, Christine Kirmaier. Switching sides—Reengineered primary charge separation in the bacterial photosynthetic reaction center. Proceedings of the National Academy of Sciences, 2020; 117 (2): 865 DOI: 10.1073/pnas.1916119117

Source: Science Daily URL: https://www.sciencedaily.com/releases/2020/02/200205132347.htm

Posts on:
Select a date from the calendar.
 
 

 Video Clip

 
  • The NA Chairwoman - Nguyen Thi Kim Ngan - hosted a reception in Hanoi on Jan 29 for Mr Tsutomu Takebe, the special advisor to Japan - Vietnam Friendship Parliamentary Alliance, who confirmed his continued contributions to developing 2 countries’ relations
  • The National Assembly Chairwoman Nguyen Thi Kim Ngan has complimented Vietnam’s U23 football team – the runner-up of the Asian Football Confederation U23 Championship (AFC), on their excellent performance and historical achievements at the continental spo
  • Vietnam U23 welcomed home: State PM Phuc welcomed in Hanoi on January 28 U23 Vietnam – the runner - up of the Asian Football Confederation U23 Championship - AFC in China, praising their excellent performance and achievements at the continental tournament
  • U23 Vietnamese football team’s return wows the foreign press: the impressive performances of the red - shirts have left a mark on the international media, as well as on the hearts of millions of football fans not only in Vietnam but all over the region
  • The Asian Football Confederation has an article praising Vietnam’s final game in Changzhou, China; it said the match at the final round wrapped up Vietnam’s memorable journey but it will live forever in the memory of fans in this Southeast Asian country
  •  

     Photo Library