HOME >> BIOLOGY >> NEWS
The role of phytochromes in bacteria revealed

The phytochromes are photosensitive substances which play an essential role in the various phases of plant development and growth. As photoreceptors they act as sensors that convey information to the plant about changes in ambient light. The two existing forms -active and inactive- can switch one to the other in response to such changes. Under red light they become active and trigger off a cascade of biochemical, in the plant cells to induce processes such as germination, flowering or stem elongation. Although it is well established that phytochromes function like light switches, the chain of biochemical reactions triggered when they are activated are still not well understood. Phytochromes were discovered in bacteria five years ago. However, their role even in these simple organisms has remained difficult to fathom. This has now been partially clarified by researchers from the IRD (Institut de Recherche pour le Dveloppement) and the CEA in conjunction with the CNRS. Their revelatory work has just been published in Nature. The study of bacteriophytochromes might give useful insights into the functional mechanisms of their counterparts in plants.

A research team jointly involving the IRD, the CEA and the CNRS has very recently found phytochromes in a strain of nitrogen-fixing bacterium, Bradyrhizobium (1), symbiont on certain tropical leguminous plants (the Aeschynomene). Techniques of molecular biology, biophysics and biochemistry revealed that the newly-discovered phytochrome has an essential role as regulator of the bacteriums photosystem synthesis. An identical function was shown in the photosynthetic bacterium Rhodopseudomonas palustris, phylogenetically very close to Bradyrhizobium (2).

The researchers experimented by subjecting Bradyrhizobium cells to different wavelengths of light, from the red to the infrared. It appeared that the bacterial photosynthetic apparatus was synthesized in its complete form only when the phytochrome was in its active
'"/>

Contact: Marie Lise Sabrie
sabrie@paris.ird.fr
33-01-48-03-75-36
Institut de Recherche Pour le Dveloppement
13-May-2002


Page: 1 2 3

Related biology news :

1. Researchers find color sensitive atomic switch in bacteria
2. Cancer vaccine based on pathogenic listeria bacteria shows promise targeting metastases
3. Researchers create nanotubes that change colors, form nanocarpet and kill bacteria
4. Scientists discover potential new way to control drug-resistant bacteria
5. 22nd amino acid synthesized and added to genetic code of e. coli bacteria
6. Missing genes may help explain why plague bacteria are so deadly
7. Complex cells likely arose from combination of bacterial and extreme-microbe genomes
8. Stuck on you: Scientists lay bare secrets of bacterial attachment proteins
9. UC Irvine scientists to develop vaccine to combat bioterrorism threat from deadly bacteria
10. UV light, coatings reduce bacterial adhesion up to 50 percent
11. PCB breakdown in rivers depends on sediment-specific bacteria, find Carnegie Mellon U. scientists

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/18/2017)... 18, 2017  Socionext Inc., a global expert in SoC-based imaging ... server, the M820, which features the company,s hybrid codec technology. A ... Tera Probe, Inc., will be showcased during the upcoming Medtec Japan ... at the Las Vegas Convention Center April ... Click here for ...
(Date:4/11/2017)... , April 11, 2017 Crossmatch®, ... secure authentication solutions, today announced that it has ... Advanced Research Projects Activity (IARPA) to develop next-generation ... program. "Innovation has been a driving ... Thor program will allow us to innovate and ...
(Date:4/6/2017)... -- Forecasts by Product Type (EAC), Biometrics, ... (Transportation & Logistics, Government & Public Sector, Utilities / ... Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), Hospitality ... looking for a definitive report on the $27.9bn Access ... ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... Florida (PRWEB) , ... October 11, 2017 , ... ... Drug Administration (FDA) has granted orphan drug designation to SBT-100, its novel anti-STAT3 ... for the treatment of osteosarcoma. SBT-100 is able to cross the cell membrane ...
(Date:10/10/2017)... PA (PRWEB) , ... October 10, 2017 , ... ... City Science Center’s FirstHand program has won a US2020 STEM Mentoring Award. Representatives ... the award for Excellence in Volunteer Experience from US2020. , US2020’s mission is ...
(Date:10/10/2017)... Calif. , Oct. 10, 2017 SomaGenics ... from the NIH to develop RealSeq®-SC (Single Cell), expected ... for profiling small RNAs (including microRNAs) from single cells ... Program highlights the need to accelerate development of approaches ... "New techniques for measuring levels ...
(Date:10/9/2017)...  BioTech Holdings announced today identification and patenting ... stem cell therapy prevents limb loss in animal ... that treatment with ProCell resulted in more than ... to standard bone marrow stem cell administration.  Interestingly, ... of therapeutic effect.  ...
Breaking Biology Technology:
Cached News: