HOME >> BIOLOGY >> NEWS
Radiation-resistant organism reveals its defense strategies

Rehovot, Israel January 9, 2003 Weizmann Institute scientists have found what makes the bacterium Deinococcus radiodurans the most radiation-resistant organism in the world: The microbe's DNA is packed tightly into a ring. The findings, published in the January 10 issue of Science, solve a mystery that has long engaged the scientific community.

The red bacterium can withstand 1.5 million rads a thousand times more than any other life form on Earth and three thousand that of humans. Its healthy appetite has made it a reliable worker at nuclear waste sites, where it eats up nuclear waste and transforms it into more disposable derivatives. The ability to withstand other extreme stresses, such as dehydration and low temperatures, makes the microbe one of the few life forms found on the North Pole. It is not surprising, then, that it has been the source of much curiosity worldwide, recently leading to a debate between NASA and Russian scientists the latter saying that it originated on Mars, where radiation levels are higher.

Since DNA is the first part of a cell to be damaged by radiation and the most lethal damage is the breakage of both DNA strands, scientists have focused on DNA repair mechanisms to find the answer to the microbe's resilience. Cells, including human cells, can mend only very few such breaks in their DNA. Microbes, for example, can repair only three to five. Yet D. radiodurans can fix more than 200. Thus scientists believed that the microbe must possess uniquely effective enzymes that repair DNA. However, a series of experiments showed that the microbe's repair enzymes were very similar to those existing in ordinary bacteria.

Using an assortment of optical and electron microscopy methods, Prof. Avi Minsky of the Weizmann Institute of Sciences Organic Chemistry Department found that the microbe's DNA is organized in a unique ring that prevents pieces of DNA broken by radiation from floating off into the cell's liqu
'"/>

Contact: Jeffrey J. Sussman
Jeffrey@acwis.org
212-895-7951
American Committee for the Weizmann Institute of Science
9-Jan-2003


Page: 1 2 3

Related biology news :

1. Scientists sequence genome of kind of organism central to biospheres carbon cycle
2. Unicellular organisms contribute more nitrogen to ocean that reported earlier
3. NHGRI adds 18 organisms to sequencing pipeline
4. Fish no exception to trend in marine-organism disease
5. Scientists urge caution when releasing engineered organisms into environment
6. Marsupial among model organisms next in line for sequencing
7. Study of primitive life form expected to provide clues to biological processes in higher organisms
8. Workshop takes systems view of information processing in organisms
9. Scientists determine identity, cell locale and quantity of nearly all proteins in an organism
10. UC Riverside to convene conference on genetically modified organisms, Oct. 14-17, 2003
11. Stay-at-home microbes: New study finds micro-organisms more complicated than we thought

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Radiation resistant organism reveals its defense strategies

(Date:2/9/2015)... , Feb. 9, 2015  Lintec of America recently ... for carbon nanotube (CNT) macrostructures, including sheets, yarns and ... (UTD). Leveraging the vast industrial resources of ... Japan , Lintec of America is forming the ... TX , focusing on scaling up the manufacturing ...
(Date:2/5/2015)... 5, 2015  Marken is starting its 35 th ... launched a new marketing campaign to solidify its place ... new campaign focuses on First as a ... The first headline in the series, ... with its client,s priorities. Marken recognizes the need to ...
(Date:2/5/2015)... , Jan. 26, 2015 NXT-ID, Inc. (NASDAQ: ... "Company"), a biometric authentication company focused on the growing ... corporate website ( http://www.nxt-id.com/ ) as part of its ... wallet. The Company launched its new consumer website for ... Pereira , CEO of NXT-ID said, "Our new corporate ...
Breaking Biology News(10 mins):Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4Marken Launches New Patient-Centric Campaign 2NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 2NXT-ID, Inc. Launches New Corporate Website As Part Of Ongoing 2015 Branding Initiatives For Wocket Smart Wallet 3
(Date:2/26/2015)... The Movement for Indefinite Life Extension (MILE) ... technologies and awareness. The event is taking place from ... 21st 2015, in a live Google Hangout broadcast from ... of MILE, says, “Our lives are in our hands, ... Indefinite Life Extension is raising awareness about bio-sciences and ...
(Date:2/26/2015)... 26, 2015 The Pittcon 2015 ... the Ernest N. Morial Convention Center in New ... of February 19, 2015) displaying products and services ... and government labs. The Exposition will offer the ... limited to, analytical chemistry; drug discovery; nanotechnology; life ...
(Date:2/26/2015)... 2015  Dyadic International, Inc. ("Dyadic") (OTCQX: DYAI), ... technologies are used to develop, manufacture and sell ... chemical, biopharmaceutical and industrial enzyme industries, announced today ... year ending December 31, 2014 after market close ... a conference call that day at 5:00 p.m. ...
(Date:2/26/2015)... Feb. 26, 2015   Lexicon Pharmaceuticals, Inc. (Nasdaq: ... present at the Cowen 35 th Annual Health Care ... in Boston .  Lexicon management will provide ... A webcast of the presentation will be available through ... the presentation will be available at www.lexpharma.com until ...
Breaking Biology Technology:Indefinite Life Extension Activists Organize Online Demonstration 2Indefinite Life Extension Activists Organize Online Demonstration 3Pittcon 2015 Announces Exposition Highlights 2Dyadic International To Announce Fourth Quarter 2014 Financial Results And Host Conference Call On Wednesday, March 11, 2015 2Dyadic International To Announce Fourth Quarter 2014 Financial Results And Host Conference Call On Wednesday, March 11, 2015 3Lexicon To Present At The Cowen 35th Annual Health Care Conference 2
Cached News: