Navigation Links
UIC chemists characterize Alzheimer's neurotoxin structure
Date:12/3/2007

Amyloid plaques, the hallmark of Alzheimer's disease, are clumps of fiber-like misfolded proteins which many experts think cause this devastating neurodegenerative disease.

While effective treatment remains an elusive goal, new research by University of Illinois at Chicago chemists suggests a possible new approach.

Yoshitaka Ishii, associate professor of chemistry, and his students managed to capture and characterize a crucial intermediate step in the formation of amyloid plaque fibers, or fibrils, showing tiny spheres averaging 20 nanometers in diameter assembling into sheet-like structures comparable to that seen in formation of fibrils.

Fibrils made of small proteins called amyloid-beta are toxic to nerve cells, but intermediate spheres, including those identified by Ishii's group, are more than 10 times as poisonous. That has made the spherical intermediates a new suspect for causing Alzheimer's disease.

"The problem with studying the structure of this intermediate form is that it's so unstable," said Ishii. His team's approach, he said, was to 'freeze-trap' the fleeting intermediate form, then use solid-state nuclear magnetic resonance to determine its structure and electron microscopes to study its morphology, or shape.

Ishii and his coworkers confirmed that the intermediate spherical stage of amyloid is more toxic than the final-form fibrils. Their findings are the first to pinpoint sheet formation at the toxic intermediate stage in the misfolding of the Alzheimer's amyloid protein and support the notion that the process of forming the layered sheet structure might be what triggers toxicity and kills nerve cells.

"Our method characterized the detailed molecular structure of this unstable, intermediate species," Ishii said. "To the best of our knowledge, this is the first characterization of detailed molecular structures for toxic amyloid intermediates. We found that the structure was very similar to the final (fibril) form, which wasn't expected at all."

Ishii said a complete determination of the intermediate structure remains to be done, but he is confident his lab will be able to do that. Once completed, the findings may provide pharmaceutical manufacturers with the information they need to create drugs that will prevent interaction between the toxic molecules and nerve cells.

Ishii said the method can also be applied to structural studies of proteins associate with other neurodegenerative diseases, including Parkinson's, and prion diseases, such as Creutzfeldt-Jakob.

"We're also interested in applying our technique in the nanoscience field to examine the formation process of peptide-based nano-assemblies," he said.


'/>"/>

Contact: Paul Francuch
francuch@uic.edu
312-996-3457
University of Illinois at Chicago
Source:Eurekalert

Related medicine news :

1. Computers help chemists fight emerging infections
2. HIDA Calls for Scrutiny of Group Purchasing Organization Distributor Fee Structure
3. Innocoll Agrees the Sale of its CollaRx(R) GENTAMICIN SURGICAL IMPLANT and European Sales and Marketing Infrastructure to EUSA Pharma
4. Purdue Pharma Selects Systech to Provide Sustainable Infrastructure for Serialization
5. Smart insulin nanostructures pass feasibility test, UT study reports
6. CRC Health Group Announces Acquisition of Durhams Structure House, Weight Loss Facility
7. Fallon Community Health Plan Selects CaseNET to Enhance Care Services Infrastructure
8. Centre De Sante et de Services Sociaux Haut-Richelieu-Rouville in Quebec Selects Alcatel-Lucent and SSP Telecom to Upgrade its Communications Infrastructure
9. Novel semiconductor structure bends light wrong way -- the right direction for many applications
10. Palmer College of Chiropractic Selects Colubris Networks to Provide Wireless Infrastructure at Three U.S. Campuses
11. Pharmos Restructures Operations in Israel
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/13/2017)... (PRWEB) , ... October 13, 2017 , ... PurhealthRX ... CBD Oil utilizing Purzorb™ technology. Applying the Purzorb™process to full spectrum CBD oil will ... and providing a CBD form that can be easily incorporated into liquid products, while ...
(Date:10/13/2017)... ... 2017 , ... Apple Rehab Shelton Lakes , which specializes in the ... facility as part of a disaster drill on October 3rd. , Apple Rehab participated ... Emergency Manager, as well as the Connecticut Long Term Care Mutual Aid Plan ...
(Date:10/13/2017)... ... October 13, 2017 , ... Ellevate Network, the leading network ... advocate for action towards gender equality at their inaugural Summit in New York City ... and reached a social audience of over 3 million. To watch the Mobilize Women ...
(Date:10/13/2017)... ... October 13, 2017 , ... Talented ... the lowdown on sciatica in a new episode of "Success Files," which is ... events and innovation and investigates each subject in-depth with passion and integrity. , ...
(Date:10/13/2017)... ... , ... “America On The Brink”: the Christian history of the United States ... creation of published author, William Nowers. Captain Nowers and his wife, Millie, have ... thirty years in the Navy. Following his career as a naval aviator and ...
Breaking Medicine News(10 mins):
(Date:10/4/2017)... , Oct. 4, 2017  According to the Centers for Disease Control ... of October . PhysicianOne Urgent Care is helping communities across ... NY , by offering no-cost* flu shots through the end of ... by certain health insurance regulations. ... best time to get a flu shot is by the end of ...
(Date:10/2/2017)... Labs announces the European launch of their new low volume, high ... in Cambridge, U.K on October 4th. The ... with unprecedented speed and sensitivity while using far less sample volume ... ... ...
(Date:9/27/2017)... , Sept. 27, 2017  DarioHealth Corp. (NASDAQ: DRIO), a leading global ... that its MyDario product is expected to appear on The Dr. Oz ... Dr. Oz Show airs in your area: http://www.doctoroz.com/page/where-watch-dr-oz-show ... The nine-time Emmy award-winning, The Dr. Oz Show kicked ... The segment features ...
Breaking Medicine Technology: