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:12/17/2014)... 16, 2014 Valencell, a leader in performance ... technology to industry leaders such as Intel, Jabra, Atlas, ... biometric wearable products. These products will be showcased at ... Las Vegas . "Our partners ... and robust – with the clinical data to back ...
(Date:12/11/2014)... Research and Markets , ... http://www.researchandmarkets.com/research/9ql3kr/biometrics_market ) has announced the addition of the ... to their offering. One major ... of multimodal biometric systems. Multimodal biometric systems utilize ... verification and identification purposes. This helps to reduce ...
(Date:12/10/2014)... WINSTON-SALEM, N.C. , Dec. 9, 2014  Wake Forest ... medical education building for its School of Medicine. Funding ... a larger capital campaign that will be publicly launched ... will be located in the former 60 series R.J. ... Forest Innovation Quarter. Construction will begin immediately with plans ...
Breaking Biology News(10 mins):Valencell PerformTek Biometrics Power the Most Accurate Wearables at CES 2015 2Biometrics Market in India 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2Wake Forest Baptist to Build New Medical Education Facility In Wake Forest Innovation Quarter 2Wake Forest Baptist to Build New Medical Education Facility In Wake Forest Innovation Quarter 3Wake Forest Baptist to Build New Medical Education Facility In Wake Forest Innovation Quarter 4
(Date:12/19/2014)... Charm Sciences is pleased to announce that ... Aflatoxin M1 in raw commingled milk is the first ... The peer reviewed report of the validation by Technology ... and Fisheries Research (ILVO-T&V) has been published by the ... most toxic aflatoxin and a known carcinogen, can be ...
(Date:12/19/2014)... PLEASANTON, Calif. , Dec. 19, 2014  Roche ... acquisition of Bina Technologies, Inc. (Bina), a privately ... California , USA. Bina provides a big ... next generation sequencing (NGS) data. Bina,s proprietary on-market ... translational and academic researchers to perform fast and ...
(Date:12/19/2014)... Dec. 19, 2014 Research and Markets ... of the "Technology Innovations in Smart Fabrics ... http://photos.prnewswire.com/prnh/20130307/600769 ... Fabrics" offers a detailed assessment on technological advancements ... Findings: 1. The Smart Fabrics ...
(Date:12/19/2014)... 2014 LayerBio is an MIT spin-off ... care. The National Eye Institute (NEI) at the National ... I SBIR grant to develop a drug-eluting intraocular lens ... common cause of vision loss in people over age ... to Dr. Ken Mandell, LayerBio’s Founder and CEO, "There ...
Breaking Biology Technology:Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2Roche acquires Bina Technologies and enters the genomic informatics market 2Roche acquires Bina Technologies and enters the genomic informatics market 3Technology Innovations in Smart Fabrics (Technical Insights) 2LayerBio Awarded NIH Grant to Develop a Drug Delivery Device for Cataract Surgery 2
Cached News: