Navigation Links
Green plant transport mystery solved
Date:1/26/2010

Contrary to prevailing wisdom, a new study from plant biologists at UC Davis shows that proteins of the Hsp70 family do indeed chaperone proteins across the membranes of chloroplasts, just as they do for other cellular structures.

The findings are published online in the January issue of the journal The Plant Cell.

One of the most crucial tasks in a living cell is to move things across membranes, both in and out of the cell and between different compartments inside.

Chloroplasts are structures inside the cells of green plants that carry out photosynthesis. Like mitochondria, which generate energy for the cell, chloroplasts are thought to be descended from a free-living organism that took up residence in an ancestral cell, bringing photosynthesis with it.

Hsp70s are known to act as 'chaperones' that escort proteins across membranes within cells, including mitochondria. But Hsp70 did not appear to work in the same way in chloroplasts, where a different protein called Hsp93 seemed to fill the chaperone role.

Research scientist Lan-Xin Shi and Steven Theg, professor of plant biology, used the moss Physcomitrella patens to study the Hsp70 proteins in chloroplasts. Unusually for a plant, Physcomitrella repairs its DNA in such a way that specific genes can be selectively "knocked out," much as they can be in a laboratory mouse.

Shi and Theg found four genes that encode chloroplast Hsp70s in the moss. Knocking out one of these genes, Hsp70-2, killed the plant. Moreover, reducing protein levels of Hsp70-2 resulted in reduced protein import into isolated chloroplasts.

The results show that principles used in the transport machineries of chloroplasts, mitochondria and other cellular bodies have been conserved through evolution, Theg said.

"I always wondered why it was different in chloroplasts," Theg said. "This opens the possibility that the mechanism works the same way in all these cases."


'/>"/>

Contact: Andy Fell
ahfell@ucdavis.edu
530-752-4533
University of California - Davis
Source:Eurekalert

Related biology news :

1. Green tea boosts production of detox enzymes, rendering cancerous chemicals harmless
2. New study shows greenback cutthroat trout involved in recovery effort misidentified
3. American Chemical Society calls green chemistry bill a smart step
4. Salmon garnish points the way to green electronics
5. Using green chemistry to deliver cutting-edge drugs
6. Green skies: Engineers work may reduce jet travels role in global warming
7. A greenhouse in order to study the impact of climate change on plants
8. Green leather is in this season
9. Study involving more than 100 scientists provides new insights on green algae
10. Green alga genome project catalogs carbon capture machinery
11. Green algae -- the nexus of plant/animal ancestry
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/22/2016)... http://www.researchandmarkets.com/research/p74whf/global_biometrics ) ... "Global Biometrics Market in Retail Sector 2016-2020" ... --> http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced the ... in Retail Sector 2016-2020" report to ... and Markets ( http://www.researchandmarkets.com/research/p74whf/global_biometrics ) has announced ...
(Date:1/20/2016)... , Jan. 20, 2016  Synaptics Incorporated (NASDAQ: ... interface solutions, today announced sampling of S1423, its ... wearables and small screen applications including smartwatches, fitness ... Supporting round and rectangular shapes, as well as ... performance with moisture on screen, while wearing gloves, ...
(Date:1/13/2016)... , January 13, 2016 ... the addition of the  "India Biometrics ... & Forecast (2015-2020)"  report to ... ) has announced the addition of ... Market - Estimation & Forecast (2015-2020)" ...
Breaking Biology News(10 mins):
(Date:2/9/2016)... 2016 BERG, a biopharmaceutical company uncovering ... has announced the appointment of Jason Haddock ... Officer. Haddock brings to BERG over 20 years ... in senior financial functions at pharmaceutical companies, as ... management. Niven R. Narain , ...
(Date:2/8/2016)... -- --> --> ... company developing next generation cancer therapeutics that are ... chairman emeritus of Tata Sons Limited, Mr Ratan ... part of the first close of Invictus,s Series ... and Aarin Capital. http://photos.prnewswire.com/prnh/20150923/766442 ) , ...
(Date:2/8/2016)... ... February 08, 2016 , ... ... of loose, bulk foods at various stages of the production process. Despite frequently ... inspect large bulk products post packaging such as sacks of dry powders. , ...
(Date:2/8/2016)... -- --> --> ... ultra-rapid Point-Of-Care (POC) molecular diagnostics company, today announces that it ... test to be launched on the Company,s io® platform. By ... test is now cleared for sale within the European Union. ... of the io® CT test signals a new era in ...
Breaking Biology Technology: