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:2/1/2017)... 2017 IDTechEx Research, a leading provider of ... the availability of a new report, Sensors for Robotics: Technologies, ... Reading ... ... Source: IDTechEx Report "Sensors for Robotics: Technologies, Markets and Forecasts 2017-2027: ...
(Date:1/26/2017)... , Jan. 26, 2017  Crossmatch, a leading provider ... new solution aimed at combatting fraud, waste and abuse ... introduced at the Action on Disaster Relief conference in ... point for UN agencies and foreign assistance organizations throughout ... waste and abuse are a largely unacknowledged problem in ...
(Date:1/24/2017)... 2017 Biopharm Reports has carried out ... of nuclear magnetic resonance spectroscopy (NMR). This involved ... current practices, developments, trends and end-user plans over ... and opportunities. These areas include growth in the ... and innovation requirements, hyphenated NMR techniques, main suppliers ...
Breaking Biology News(10 mins):
(Date:2/17/2017)... ... 17, 2017 , ... Academy of Model Aeronautics (AMA), the ... of unmanned aircraft systems (UAS), are launching a joint program to promote safe ... support educational outreach efforts. , AMA and DJI will collaborate on other potential ...
(Date:2/16/2017)... MENLO PARK, Calif. and ... -- Longitude Capital, a private investment firm focused on ... today announced the promotion of Josh Richardson ... Richardson focuses on investments in biotechnology companies.  He ... and has played important roles in Longitude,s investments ...
(Date:2/16/2017)... 2017   Biostage, Inc. (Nasdaq: ... developing bioengineered organ implants to treat cancers and other ... today the closing on February 15, 2017 of its ... stock and warrants to purchase 20,000,000 shares of common ... offering was priced at $0.40 per share of common ...
(Date:2/16/2017)... Malden, MA (PRWEB) , ... February 16, 2017 ... ... viscoelastic 4-level cervical case. Dr. Kingsley Chin, professor and Harvard trained surgeon, completed ... The procedure was performed on a 55-year-old practicing female physician suffering from degenerative ...
Breaking Biology Technology:
Cached News: