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NSF Press Release

 


Embargoed Until: 12 A.M. Eastern Time
NSF PR 04-02 - January 12, 2004

Media contact:

 Josh Chamot

 (703) 292-7730

 jchamot@nsf.gov

Program contact:

 Mike Clarke

 (703) 292-4967

 mclarke@nsf.gov

Chemists Crack Secrets of Nature's Super Glue
Mussel-powered proteins stick to Teflon, even under water

ARLINGTON, Va.—Researchers have discovered that iron in seawater is the key binding agent in the super-strong glues of the common blue mussel, Mytilus edulis. This is the first time researchers have determined that a metal such as iron is critical to forming an amorphous, biological material.

In addition to using the knowledge to develop safer alternatives for surgical and household glues, the researchers are looking at how to combat the glue to prevent damage to shipping vessels and the accidental transport of invasive species, such as the zebra mussel that has ravaged the midwestern United States.

National Science Foundation CAREER awardee Jonathan Wilker, Mary Sever and their colleagues at Purdue University announce their discovery in the Jan. 12 issue of Angewandte Chemie.

En route to crafting synthetic versions of the glue, the researchers discovered that bivalves extract the metal iron from the surrounding seawater and use it to join proteins together, linking the fibrous molecules into a strong, adhesive mesh. The 800 mussels in Wilker's laboratory have an uncanny ability to stick to almost anything, even Teflon®.

Comment from Wilker regarding research:

"Mussel glues present the first identified case in which transition metals are essential to the formation of a non-crystalline biological material," says NSF CAREER awardee Jonathan Wilker of Purdue University.

"We are curious as to whether or not this newly discovered, metal-mediated protein cross-linking mechanism of material formation is a prevalent theme in biology. We will be exploring systems such as barnacle cement, kelp glue and oyster cement to see how other biomaterials are produced," says NSF CAREER awardee Jonathan Wilker of Purdue University.

"The biological origin of this glue and the ability to stick to nearly all surfaces invite applications such as the development of surgical adhesives," says NSF CAREER awardee Jonathan Wilker of Purdue University.

"Understanding how marine glues are formed could be key to developing surfaces and coatings to prevent adhesion processes. Current antifouling paints rely upon releasing copper into surrounding waters, thereby killing barnacles in their larval state. We are hoping our results will help make antifouling paints that do not require the release of toxins into the marine environment," says NSF CAREER awardee Jonathan Wilker of Purdue University.

NSF comments regarding the research discovery and the Wilker group:

"It appears that the strength, sticking power and endurance of these extraordinary biological materials may derive from inorganic chemistry," says chemist Mike Clarke, the NSF program officer who oversees Wilker's award.

"Proteins often rely on metal ions to tie them together and provide stability, but this is the first time that a transition metal ion has been determined to be an integral part of a biological material," says chemist Mike Clarke, the NSF program officer who oversees Wilker's award.

"The research wonderfully illustrates the potential for metal ions to strengthen materials by cross-linking polymer chains. More important to researchers is the tantalizing suggestion that the remarkable adhesive properties of these biological glues lie in an iron-dependent oxidation to radicals," says chemist Mike Clarke, the NSF program officer who oversees Wilker's award.

"This discovery could lead to the creation of unusual new materials with designed plasticity, strength and adhesiveness for household, structural and biological uses. Perhaps, these properties could even be made dependent upon electrochemical potential thereby creating new vistas for electronic materials," says chemist Mike Clarke, the NSF program officer who oversees Wilker's award.

-NSF-

Additional Resources:

Principal Investigator: Jonathan Wilker, (765) 496-3382, wilker@purdue.edu
Purdue University Media Officer: Chad Boutin, (765) 494-2081, cboutin@purdue.edu
Wilker Research Group Web Site: http://www.chem.purdue.edu/wilker/

Purdue University News: http://news.uns.purdue.edu

NSF CAREER Award homepage: http://www.nsf.gov/home/crssprgm/career/start.htm


The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering, with an annual budget of nearly $5.3 billion. NSF funds reach all 50 states through grants to nearly 2,000 universities and institutions. Each year, NSF receives about 30,000 competitive requests for funding, and makes about 10,000 new funding awards. The NSF also awards over $200 million in professional and service contracts yearly.

The Faculty Early Career Development (CAREER) Program is a Foundation-wide activity that offers the National Science Foundation’s most prestigious awards for new faculty members. The CAREER program recognizes and supports the early career-development activities of those teacher-scholars who are most likely to become the academic leaders of the 21st century. CAREER awardees will be selected on the basis of creative, career-development plans that effectively integrate research and education within the context of the mission of their institution. NSF encourages submission of CAREER proposals from new faculty at all CAREER eligible institutions. Such plans should build a firm foundation for a lifetime of integrated contributions to research and education.

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common blue mussel
Common blue mussel (Mytilus edulis) hangs tough after a night adhering to otherwise "non-stick" Teflon®.
Credit: Jonathan Wilker of Purdue University, NSF
Select image for larger version
(Size: 310KB)

common blue mussel from coastal Maine
Common blue mussel (Mytilus edulis) from coastal Maine extends its foot for the camera.
Credit: Jonathan Wilker of Purdue University, NSF
Select image for larger version
(Size: 144KB) , or download a high-resolution TIFF version of image (3.62MB)

small colony of common blue mussels
The small colony of common blue mussels adhered to this glass plate in the Wilker research laboratory in one evening.
Credit: Jonathan Wilker of Purdue University, NSF
Select image for larger version
(Size: 254KB) , or download a high-resolution TIFF version of image (3.98MB)

sample of the natural glue extract
A sample of the natural glue extract before it is cured.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 143KB) , or download a high-resolution TIFF version of image (3.17MB)

an Instron Materials Testing Apparatus
Wilker and his colleagues use an Instron Materials Testing Apparatus, or "tensile tester," to test the compressional strength of the mussel glues.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 111KB) , or download a high-resolution TIFF version of image (1.91MB)

clamps that test the ability of the glue
Wilker and his colleagues use the "tensile tester" and these clamps to test the ability of the glue to hold materials together when being stretched.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 122KB) , or download a high-resolution TIFF version of image (1.83MB)

Jonathan Wilker with his laboratory team
Jonathan Wilker (center) with his laboratory team: (rear left to right) Mary Sever, Mildred Rodriguez, Jennifer Monahan, Jessi Buetow; (front left to right) Jaime Weisser, Megan Lockard, Trinity Horton, Beth Hamilton.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 135KB) , or download a high-resolution TIFF version of image (2.03MB)

the mussel glue
The mussel glue, or plaque, as imaged by a scanning electron microscope at a magnification of 25,000X. The glue layer (top) attaches to a glass slide.
Credit: Debby Sherman and Jonathan Wilker, Purdue University, NSF
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(Size: 159KB) , or download a high-resolution TIFF version of image (1.55MB)

pontoon boat encrusted with zebra mussels
The hull of this pontoon boat is encrusted with zebra mussels. The bivalves were introduced to the United States in the 1980s, probably as stowaways in the ballast of a ship that traveled from Europe to the Great Lakes. Without natural predators, the mussels spread throughout America's waterways, infesting ships and infrastructure and competing for resources with native species. Wilker and his team are studying the properties of zebra mussel glue to find ways to prevent the animals from hitching rides on vessels.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 285KB) , or download a high-resolution TIFF version of image (4.27MB)

Jonathan Wilker collecting zebra mussels
Jonathan Wilker collecting zebra mussels from a freshwater lake in northeast Indiana.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 92KB) , or download a high-resolution TIFF version of image (1.60MB)

tank full of blue mussels
The 150-gallon tank that Wilker's more than 800 common blue mussels call home. The tank is part of a 300-gallon system that circulates water through the mussels' environment.
Credit: Jonathan Wilker of Purdue University, NSF
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(Size: 186KB) , or download a high-resolution TIFF version of image (1.82MB)

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