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

Page: 1 2

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:9/16/2014)... harks a season of bounty. Fungi of dizzying variety ... woodlands in search of elusive but delectable wild mushrooms. ... the treasure hunt, and their mysterious not-quite-meat, not-quite-vegetable qualities ... mushrooms which you are eating known to science? , ... although some estimates range up to 10 million ...
(Date:9/15/2014)... cell division has evolved a simple, mechanical solution ... the Sept. 11 Science Express. ... counts and misalignments that lead to infertility, miscarriage, ... cell division cause these problems, but what exactly ... Marston of the Wellcome Trust Center for Cell ...
(Date:9/15/2014)... carbon-halogen bonds are produced naturally across all kingdoms of ... with a broad range of biological activities. The presence ... profound influence on their molecular properties. , ... been to find the late-stage, site-specific incorporation of a ... an sp C-H bond (one of the most inert ...
Breaking Biology News(10 mins):What's for dinner? Rapidly identifying undescribed species in a commercial fungi packet 2What's for dinner? Rapidly identifying undescribed species in a commercial fungi packet 3Cells simply avoid chromosome confusion 2Cells simply avoid chromosome confusion 3Pitt chemical biologist finds new halogenation enzyme 2
... To be published in the June 1 issue of ... comprehensive profile to date of microRNA (miRNA) expression during ... of which are completely novel) in a developmental and ... time ever in a vertebrate ?a new class of ...
... consortium of researchers has for the first time lifted the ... ?or set of all genes ?of the most destructive enemy ... disease. , Dr. Ralph Dean, professor of plant pathology and ... Research, is the lead author of a research paper that ...
... where you might find love these days. A team ... psychologist found love-related neurophysiological systems inside a magnetic resonance ... brains of 17 young men and women who each ... , The multidisciplinary team found that early, intense romantic ...
Cached Biology News:Researchers uncover sequence of major rice pathogen 2Researchers uncover sequence of major rice pathogen 3Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive 2Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive 3Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive 4Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive 5Love's all in the brain: fMRI study shows strong, lateralized reward, not sex, drive 6
(Date:9/16/2014)... Sydney, Australia (PRWEB) September 16, 2014 RENU ... Redox Signaling molecules, became available for purchase in Australia ... hosting a nationwide tour beginning September 16th. The tour will ... on the 17th, Bundaberg on the 18th, Sydney on the ... the market in Australia and New Zealand and to educate ...
(Date:9/15/2014)... GREENBELT, Md. , Sept. 15, 2014 /PRNewswire/ ... a leading innovator of scientific products and services ... government-wide One Acquisition Solution for Integrated Services (OASIS) ... Service (FAS). GST was selected to provide the ... in the Small Business (SB) category in Pool ...
(Date:9/15/2014)... EnGeneIC, Ltd. , an emerging ... cancer through the targeted delivery of therapeutic agents ... the Asbestos Disease Research Institute (ADRI), it has ... (NSW) Premier,s Award for Excellence in Translational Cancer ... that will be involved in the clinical trial, ...
(Date:9/15/2014)... State University have developed a technique for controlling the ... voltages, opening the door to a new generation of ... hinges on the fact that the oxide "skin" of ... acts as a surfactant, lowering the surface tension ... researchers used a liquid metal alloy of gallium and ...
Breaking Biology Technology:Global Wellness Company Hosts ASEA Australia Tour September 16-22 2Global Science & Technology, Inc. Awarded GSA OASIS Small Business Contract 2Global Science & Technology, Inc. Awarded GSA OASIS Small Business Contract 3EnGeneIC Named a Recipient of the Cancer Institute NSW Premier's Award for Excellence in Translational Cancer Research 2EnGeneIC Named a Recipient of the Cancer Institute NSW Premier's Award for Excellence in Translational Cancer Research 3Researchers control surface tension to manipulate liquid metals 2
... , , , ... Bulletin Board: BLFS), a leading developer, manufacturer, and marketer of ... launch of its BloodStor biopreservation media product platform. The ... blood stem cells, as well as other variants for peripheral ...
... , , LAKE MARY, Fla., ... Inc. (NasdaqCM: NGBF) today announced that on August 26, 2009, ... staff indicating that, based on the Company,s stockholders equity as ... the quarter ended June 30, 2009, the Company is no ...
... Mylan Inc. (Nasdaq: MYL ) today is pleased ... notified by the World Health Organization (WHO) Prequalification of Medicines ... for Matrix Unit 8, which is located in the Vizianagaram ... , Mylan Inc., which provides products to customers ...
Cached Biology Technology:BloodStor(TM) Stem Cell Biopreservation Media Platform Launched by BioLife Solutions 2BloodStor(TM) Stem Cell Biopreservation Media Platform Launched by BioLife Solutions 3New Generation Biofuels Receives NASDAQ Notice of Noncompliance with Continued Listing Requirements 2
... CrysScreen is a software package ... user interface for custom buffer creation, ... management in crystallization trials. The software ... steps in automated protein crystallography: ...
BD Falcon insert HTS 96 well, square A-bottom with lid. PET membrane, sterile. (5/ca) Packaging: 5 / pack, 5 / case ...
... 96-well semi-skirted PCR plate, Directly compatible with ... Flat deck for improved sealing characteristics ... seals, mats or cap strips, Certified free ... We are part of Thermo Fisher Scientific, ...
Vented Caps for 75 cm2 Flasks...
Biology Products: