Navigation Links
UT Knoxville and ORNL researchers reveal key to how bacteria clear mercury pollution
Date:10/1/2009

KNOXVILLE -- Mercury pollution is a persistent problem in the environment. Human activity has lead to increasingly large accumulations of the toxic chemical, especially in waterways, where fish and shellfish tend to act as sponges for the heavy metal.

It's that persistent and toxic nature that has flummoxed scientists for years in the quest to find ways to mitigate the dangers posed by the buildup of mercury in its most toxic form, methylmercury.

A new discovery by scientists at the University of Tennessee, Knoxville, and Oak Ridge National Laboratory, however, has shed new light on one of nature's best mercury fighters: bacteria.

"Mercury pollution is a significant environmental problem," said Jeremy Smith, a UT-ORNL Governor's Chair and lead author of the new study. "That's especially true for organisms at or near the top of the food chain, such as fish, shellfish, and ultimately, humans. But some bacteria seem to know how to break down the worst forms of it. Understanding how they do this is valuable information."

Scientists have known that a specific enzyme, known as MerB, gives the bacteria the ability to convert methylmercury into a less-toxic form of mercury that poses substantially less environmental risk, a trait that lets them survive in mercury-rich environments. Finding out how this enzyme works potentially may be a viable way to combat methylmercury.

The UT Knoxville and ORNL researchers, working with colleagues from the University of Georgia and University of California, San Francisco, were able to determine the mechanism -- at the most detailed level -- of how the MerB enzyme breaks apart the dangerous methylmercury molecule.

The scientists used high-performance computers to determine how the three-dimensional structure of the enzyme uses a sort of one-two-three punch to break apart a key link in the methylmercury, between mercury and carbon atoms. Once that bond is broken, the resulting substance is on the way to becoming substantially less harmful to the environment.

Knowing the exact layout of atoms within both the methylmercury and the MerB enzyme, the researchers found out how the enzyme creates an electric field that shifts around electrons in the methylmercury, priming the toxin for deconstruction. The research is a feat that would have been impossible only a year ago. By using increasingly powerful tools, scientists are able to see much more clearly how the "puzzle pieces" of chemical reactions interact.

The next challenge researchers face will be to find a way to take this new understanding of how methylmercury can be broken down and apply it in an ecosystem at large. At least in concept, using these types of bacteria or hijacking the chemical principles they use may provide a way to combat the buildup of methylmercury.

"There's definitely more work to be done in finding ways to build on what we've learned," said Jerry Parks, an ORNL staff scientist and co-author of the study. "But, we're optimistic that these findings can lead to a productive way to address mercury in the environment."


'/>"/>

Contact: Jay Mayfield
jay.mayfield@tennessee.edu
865-974-9409
University of Tennessee at Knoxville
Source:Eurekalert

Related biology news :

1. UT Knoxville professor finds unexpected key to flowering plants diversity
2. UT Knoxville wins $16M NSF mathematics and biology center
3. UT Knoxville wins 2 $3M National Science Foundation research and education grants
4. Researchers identify proteins involved in new neurodegenerative syndrome
5. Texas researchers and educators head for Antarctica
6. MGH researchers describe new way to identify, evolve novel enzymes
7. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
8. U of MN researchers discover noninvasive diagnostic tool for brain diseases
9. U of Minnesota researchers discover noninvasive diagnostic tool for brain diseases
10. Researchers discover new strategies for antibiotic resistance
11. Researchers find new taste in fruit flies: carbonated water
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/14/2016)... MELBOURNE, Florida , March 14, 2016 ... on the growing mobile commerce market, announces the airing of ... York channels starting the week of March 21 st . ... and CNBC, including its popular Squawk on the Street show. ... company focused on the growing mobile commerce market, announces the ...
(Date:3/11/2016)... -- http://www.apimages.com ) - --> http://www.apimages.com ) ... AP Images ( http://www.apimages.com ) - Germany ... the new refugee identity cards. DERMALOG will be unveiling this device, ... Hanover next week.   --> Germany ... produce the new refugee identity cards. DERMALOG will be unveiling this ...
(Date:3/10/2016)... , March 10, 2016 ... new market research report "Identity and Access Management Market ... Audit, Compliance, and Governance), by Organization Size, by Deployment, ... 2020", published by MarketsandMarkets, The market is estimated to ... 12.78 Billion by 2020, at a Compound Annual Growth ...
Breaking Biology News(10 mins):
(Date:4/29/2016)... ... April 29, 2016 , ... Intelligent Implant Systems announced today that the two-level ... sale in the United States. These components expand the capabilities of the system ... sales beginning in October of 2015, the company has seen significant sales growth in ...
(Date:4/28/2016)... The report "Cryocooler Market by ... (Technical Support, Product Repairs & Refurbishment, Preventive Maintenance, and ... 2022", published by MarketsandMarkets, the global market is expected ... a CAGR of 7.29% between 2016 and 2022. ... Figures spread through 159 Pages and in-depth TOC on ...
(Date:4/28/2016)... ... April 28, 2016 , ... ... Connecticut's innovative, growing companies, today announced the launch of VentureClash , a ... companies. , “VentureClash looks to attract the best early-stage companies here ...
(Date:4/28/2016)... ... April 28, 2016 , ... As ... recruiting top industry experts, and expanding its LATAM network and logistics capabilities. ... clients to manage their clinical trial projects. , The expansion will provide unmatched ...
Breaking Biology Technology: