Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Pairing Nanoparticles with Proteins

A cryo-electron micrograph showing a single layer of evenly spaced enzyme structures (colorful "wheels") interspersed with gold nanoparticles (magenta). Constructing such regular arrays of biomolecules might help develop high efficiency electrodes for biofuels or improve the resolution of cryo-electron microscopy in structural biology.
A cryo-electron micrograph showing a single layer of evenly spaced enzyme structures (colorful "wheels") interspersed with gold nanoparticles (magenta). Constructing such regular arrays of biomolecules might help develop high efficiency electrodes for biofuels or improve the resolution of cryo-electron microscopy in structural biology.

Abstract:
New ways to tag, engineer molecules for energy conversion, drug delivery, and medical imaging

Pairing Nanoparticles with Proteins

UPTON, NY | Posted on June 27th, 2007

In groundbreaking research, scientists have demonstrated the ability to strategically attach gold nanoparticles -- particles on the order of billionths of a meter -- to proteins so as to form sheets of protein-gold arrays. The nanoparticles and methods to create nanoparticle-protein complexes can be used to help decipher protein structures, to identify functional parts of proteins, and to "glue" together new protein complexes. Applications envisioned by the researchers include catalysts for converting biomass to energy and precision "vehicles" for targeted drug delivery.

The research, which was conducted at the U.S. Department of Energy's Brookhaven National Laboratory, will be published in the July 2, 2007 issue of the journal Angewandte Chemie.

"Our study demonstrates that nanoparticles are appealing templates for assembling functional biomolecules with extensive potential impact across the fields of energy conversion, structural biology, drug delivery, and medical imaging," said lead author Minghui Hu, a postdoctoral student working with James Hainfeld, Raymond Brinas, Luping Qian, and Elena Lymar in the Biology Department at Brookhaven Lab.

In the field of energy conversion, scientists have been searching for efficient ways to convert organic fuels such as ethanol into electricity using catalytic electrodes. But making single layers of densely packed enzymes, the functional part of such catalytic electrodes, has been a challenge. This new research shows that precisely engineered gold nanoparticles can be used to "glue" enzymes together to form oriented and ordered single layers, and that these monolayers are mechanically stable enough to be transferred onto a solid surface such as an electrode.

For this research, the scientists attached gold nanoparticles to an enzyme complex that helps drug-resistant tuberculosis bacteria survive, which has been studied by Brookhaven Lab biologist Huilin Li. The researchers suggest that gold nanoparticles might also be tailored to inactivate this enzyme complex, thereby thwarting drug-resistant TB -- a research avenue they may explore in future studies.

In another part of the study, the researchers used proteins found on the surface of adenovirus, a virus that causes the common cold. Previous studies by Broookhaven's Paul Freimuth have characterized how this virus binds to the human cells it infects, and have suggested that modified forms of adenovirus could be used as vehicles to deliver drugs to specific target cells, such as those that make up tumors.

One key to this approach would be to enhance strong binding to the target cells. Toward that end, Hu and Hainfeld's group attached multiple viral proteins to the gold nanoparticles. Such constructs should have increased binding affinity for target cells and their larger size should extend blood residence time for improved drug delivery.

In another application, this new research showed that gold nanoparticles can enhance scientists' ability to decipher the structures and functionally important regions of protein molecules - the workhorses that carry out every function of living cells and whose dysfunction often leads to disease. With added nanoparticles, the "signal-to-noise ratio" and resolution of an imaging technique known as cryo-electron microscopy were significantly increased. This method might enable analysis of small biological macromolecules and complexes that are currently intractable to analyze by cryo-electron microscopy or x-ray crystallography.

Throughout this work, the biggest challenge was to synthesize size-controllable nanoparticles coated with organic molecules designed to react with specific protein sites. Hu explains the steps: "First, we design the specific interactions between gold nanoparticles and the proteins by coating the gold nanoparticles with functional organic molecules using a biocompatible linker. Then we add a genetically engineered sequence of peptides, called a "tag," to the protein molecule, which acts as the binding site for the gold nanoparticles. Finally, we incubate the nanoparticles with the protein solution to allow the nanoparticles and proteins to bind, transfer the solution onto a transmission electron microscopy grid, and analyze the complexes using state-of-the-art electron microscopes."

####

About Brookhaven National Laboratory
This research was funded by Brookhaven's Laboratory Directed Research and Development program, the Office of Environmental and Biological Research within the U.S. Department of Energy's Office of Science, and by the Institute of General Medical Sciences within the National Institutes of Health. Collaborators on the research include: Huilin Li, Guiqing Hu, Yanbiao Zhang, and Paul Freimuth, all from the Biology Department at Brookhaven, and Joseph Wall, Martha Simon, Beth Lin, and Frank Kito of the Brookhaven Lab scanning transmission electron microscope (STEM) team.

One of ten national laboratories overseen and primarily funded by the Office of Science of the U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical, biomedical, and environmental sciences, as well as in energy technologies and national security. Brookhaven Lab also builds and operates major scientific facilities available to university, industry and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven Science Associates, a limited-liability company founded by the Research Foundation of State University of New York on behalf of Stony Brook University, the largest academic user of Laboratory facilities, and Battelle, a nonprofit, applied science and technology organization.

Visit Brookhaven Lab's electronic newsroom for links, news archives, graphics, and more: http://www.bnl.gov/newsroom
--
Media & Communications Office (631) 344-2345 phone
Community, Education, Government (631) 344-8350 phone
& Public Affairs Directorate (631) 344-3368 fax
Brookhaven National Laboratory
Upton NY 11973 http://www.bnl.gov

For more information, please click here

Contacts:
Karen McNulty Walsh

(631)344-8350
or
Mona Rowe

(631) 344-5056

Copyright © Brookhaven National Laboratory

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Nanomedicine

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

High-temperature plasmonics eyed for solar, computer innovation April 17th, 2014

Harris & Harris Group Continues Its Blog Series to Highlight Most Impactful Portfolio Companies With Champions Oncology, Inc. April 17th, 2014

Discoveries

Novel stapled peptide nanoparticle combination prevents RSV infection, study finds April 17th, 2014

Thinnest feasible membrane produced April 17th, 2014

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

High-temperature plasmonics eyed for solar, computer innovation April 17th, 2014

Announcements

More effective kidney stone treatment, from the macroscopic to the nanoscale April 17th, 2014

High-temperature plasmonics eyed for solar, computer innovation April 17th, 2014

INSCX™ exchange to present Exchange trade reporting mechanism for engineered nanomaterials (NMs) to UK regulation agencies, insurers and upstream/downstream users April 17th, 2014

Transparent Conductive Films and Sensors Are Hot Segments in Printed Electronics: Start-ups in these fields show above-average momentum, while companies working on emissive displays such as OLED are fading, Lux Research says April 17th, 2014

Energy

High-temperature plasmonics eyed for solar, computer innovation April 17th, 2014

Scientists Capture Ultrafast Snapshots of Light-Driven Superconductivity: X-rays reveal how rapidly vanishing 'charge stripes' may be behind laser-induced high-temperature superconductivity April 16th, 2014

Engineers develop new materials for hydrogen storage April 15th, 2014

A molecular approach to solar power: Switchable material could harness the power of the sun — even when it’s not shining April 15th, 2014

NanoNews-Digest
The latest news from around the world, FREE







  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE