Navigation Links
Photosynthesis: The last link in the chain
Date:1/4/2013

For almost 30 years, researchers have sought to identify a particular enzyme that is involved in regulating electron transport during photosynthesis. A team at Ludwig-Maximilians-Universitt (LMU) in Munich has now found the missing link, which turns out to be an old acquaintance.

Photosynthesis sustains life on Earth by providing energy-rich compounds and the molecular oxygen that higher organisms depend on. The process is powered by sunlight, which is captured by "biochemical solar cells" called photosystems that are found in plants, algae and certain types of bacteria. Plants have two photosystems, PSI and PSII. Each consists of a pigment-protein complex that uses solar energy to raise electrons to a higher energy level. These are then passed along a chain of electron acceptors, and the energy released is employed for synthesis of ATP, the "coinage" used for all energy transactions in cells.

Electron transport can proceed along several different routes. So-called linear electron transport requires the participation of both PSI and PSII, and delivers the electrons to a small molecule called NADP, forming NADPH. Cyclic electron flow on the other hand - which can take two alternative paths - involves only PSI, and is used solely for the production of ATP. Electrons that follow the major route are passed via an acceptor called plastoquinone to the cytochrome b6f complex and from there back to PSI, thus completing the cycle.

"The identity of the carrier that donates electrons to plastoquinone, and thus makes the process of cyclic electron flow possible, has long been a subject of controversy," says LMU biologist Professor Dario Leister, who, together with other members of his group, has now succeeded in identifying the crucial missing link in the process.

The crossroads that closes the circuit

Plants can switch between linear and cyclic modes of electron transport in order to maintain the appropriate balance between
'/>"/>

Contact: Kathrin Bilgeri
kathrin.bilgeri@lmu.de
49-892-180-6938
Ludwig-Maximilians-Universitt Mnchen
Source:Eurekalert

Page: 1 2

Related biology news :

1. Oil and water: An icy interaction when oil chains are short, but steamy when chains are long
2. Chain reaction in the human immune system trapped in crystals
3. Pilot Results Move GHX Closer to Delivery of Healthcare Industrys First Implantable Device Supply Chain Solution
4. Stanford scientists document fragile land-sea ecological chain
5. Copper chains: Study reveals Earths deep-seated hold on copper
6. Study confirms oil from Deepwater Horizon disaster entered food chain in the Gulf of Mexico
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/22/2015)... , Jan. 22, 2015 Infinisource has launched its ... the G2 model. The G2 sets a higher standard for ... human capital management solution. With plug-and-play installation, touch screen interface ... clock provides a robust time collection solution for the small ...
(Date:12/19/2014)... Markets ( http://www.researchandmarkets.com/research/8kmfcn/iphone_5s ) has announced the ... Apple/AuthenTec TMDR92 & Sapphire - Technology Report" report ... Following the acquisition of AuthenTec in ... the iPhone 5S. It is currently the only device ...
(Date:12/17/2014)... Va. , Dec. 15, 2014 The Defense ... easier to detect and prevent counterfeit microcircuits from entering ... started performing an in-house microcircuit anti-counterfeit initiative dubbed DNA ... microcircuits while increasing their reliability throughout the supply chain. ...
Breaking Biology News(10 mins):Infinisource's NXG series sets new time clock standard 2iPhone 5S Fingerprint Sensor - Apple/AuthenTec TMDR92 & Sapphire - Technology Report 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3
... In the decade that has passed since the completion ... biologists have grown increasingly aware of a problem ironically ... experiments in the age of genomics -- including DNA ... binding, and other information-rich inquiries -- generate quantities of ...
... University of Wisconsin-Milwaukee (UWM) offer potential for development ... A common beta blocker, propranolol, currently ... has shown to be effective in preventing the ... in animal-addiction models, according to Devin Mueller, UWM ...
... Earth," a review paper that will be published on July ... the decline of large predators and herbivores in all regions ... freshwater, and marine ecosystems. The paper claims that the loss ... influence on nature." The research was funded primarily by the ...
Cached Biology News:Scientists to assemble 'knowledgebase' on plants, microbes, to aid US biofuel, environment efforts 2Scientists to assemble 'knowledgebase' on plants, microbes, to aid US biofuel, environment efforts 3UWM research offers hope for treatment of cocaine addiction 2Loss of top animal predators has massive ecological effects 2Loss of top animal predators has massive ecological effects 3
(Date:1/22/2015)... Cambridge Semantics, the leading provider of smart ... 2014 was a record-breaking year across the board for the ... Smart Data Platform and our Smart Data solutions, our customers ... data which led to record growth for the company in ...
(Date:1/22/2015)... 22, 2015 Pipette.com has added the ... their comprehensive portfolio of Eppendorf products. , The Eppendorf ... a Centrifuge 5424/5424 R and receive the following:, ... Research plus or Eppendorf Reference 2 , ...
(Date:1/22/2015)... January 22, 2015 Selexis SA, a ... Research Cell Banks (RCBs) used for drug discovery to ... Banks will include Next-Generation Sequencing (NGS) data ... de-risks biologic manufacturing by ensuring the integrity of the ...
(Date:1/22/2015)... Calif. , Jan. 22. 2015  Varian Medical Systems (NYSE: ... software, has been honored for its commitment to sustainability with ... companies. Varian is the highest ranked healthcare equipment company among ... today during the World Economic Forum at Davos, ...
Breaking Biology Technology:Cambridge Semantics Announces Record Results for 2014 2Eppendorf Announces Promotional Bundle Which Includes: Eppendorf Centrifuge 5424, 3-Pack of Pipettes, and Tips - Available Now at Pipette.com 2Selexis Generated Research Cell Banks Now Fully Sequenced Using Next-Generation Sequencing 2Varian Honored Among World's 100 Most Sustainable Corporations 2
... been poked and prodded by television ads, pollsters and even ... beer at your neighborhood bar and George W. Bush read ... more in Wisconsin in 2004 than he was seen everywhere ... been in the state so often he's beginning to lose ...
... Brookfield, Wisconsin, telecommunications provider, has launched a new voice ... in Wisconsin and the Chicago area. Next month, the ... Minnesota, Michigan, and Indiana, according to Bernie Rosen, vice ... voice, data and Internet services into one Web-based provider. ...
... joins French company to provide drug purification products ... Alliant Energy announces dip in third-quarter earnings ... selects Citrix IT tools Wisconsin-based ... , Analogix , a maker of drug-purification devices ...
Cached Biology Technology:Twenty ways you can tell this campaign has finally pushed you over the edge 2Tech Digest: whats moving in the Midwest (11/1/04) 2
... Large (Klenow) Fragment, Exonuclease Minus, is a ... 5´→3´ and the 3´→5´ exonuclease activities present ... (1,2). It is used for random primer ... (5). Klenow Fragment, Exonuclease Minus, will leave ...
SMVT (N-14)...
...
... to Dideoxycytidine Dideoxycytidine is a cytidine analog ... inhibiting retroviral activity. Immunogen: Chemical ... Specificity: The specificity of the ddC antiserum ... moles of ddC to moles of ddC analog ...
Biology Products: