Navigation Links
Hugging hemes help electrons hop
Date:1/15/2014

RICHLAND, Wash. -- Researchers simulating how certain bacteria run electrical current through tiny molecular wires have discovered a secret Nature uses for electron travel. The results are key to understanding how the bacteria do chemistry in the ground, and will help researchers use them in microbial fuel cells, batteries, or for turning waste into electricity.

Within the bacteria's protein-based wire, molecular groups called hemes communicate with each other to allow electrons to hop along the chain like stepping stones. The researchers found that evolution has set the protein up so that, generally, when the electron's drive to hop is high, the heme stepping stones are less tightly connected, like being farther apart; when the drive to hop is low, the hemes are more closely connected, like being closer together. The outcome is an even electron flow along the wire.

This is the first time scientists have seen this evolutionary design principle for electron transport, the researchers reported Jan. 2 in Proceedings of the National Academy of Sciences Early Edition Online.

"We were perplexed at how weak the thermodynamic driving force was between some of these hemes," said geochemist Kevin Rosso of the Department of Energy's Pacific Northwest National Laboratory. "But it turns out those pairs of hemes are essentially hugging each other. When the driving force is strong between hemes, they are only shaking hands. We've never seen this compensation scheme before, but it seems that the purpose is to allow the protein to transfer electrons with a steady flow along heme wires."

Living Wires

Certain bacteria breathe using metal like people use oxygen. In the process, these bacteria steal electrons from carbon and ultimately transfer the electrons to metals or minerals in the ground. They do this by conducting electricity along molecular wires built into proteins, moving internal electrons to the outside of
'/>"/>

Contact: Mary Beckman
mary.beckman@pnnl.gov
509-375-3688
DOE/Pacific Northwest National Laboratory
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Carbon farming schemes should consider multiple cobenefits
2. Geosphere adds 2 new special issue themes
3. Environment schemes for kids influence parents behavior
4. Farmer-led irrigation schemes could alter food security in sub-Saharan Africa, South Asia
5. Scientists trick iron-eating bacteria into breathing electrons instead
6. Temporary storage for electrons: Natural method of producing hydrogen
7. Physicists explore properties of electrons in revolutionary material
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Hugging hemes help electrons hop
(Date:7/31/2014)... GAINESVILLE, Fla. --- By tracing nearly 3,000 genes ... moths, University of Florida scientists have created an ... to use large-scale, next-generation DNA sequencing. , ... more closely related to small moths than to ... how butterflies evolved. The study also found that ...
(Date:7/31/2014)... NCT00518336) shows the sustained efficacy, immunogenicity and ... vaccine Cervarix. Women vaccinated with the HPV-16/18 ... nine years, and vaccine efficacy (VE) against ... longest follow-up report for a licensed HPV ... full paper. , HPV and vaccination ...
(Date:7/31/2014)... This news release is available in German . ... (MOFs) can take up gases similar to a sponge ... are suited for storing hydrogen or greenhouse gases. However, ... of Karlsruhe Institute of Technology (KIT) now report in ... by cor-rosion of the MOF surface. This can be ...
Breaking Biology News(10 mins):UF study advances 'DNA revolution,' tells butterflies' evolutionary history 2UF study advances 'DNA revolution,' tells butterflies' evolutionary history 3Sustained efficacy, immunogenicity, and safety for GlaxoSmithKline's HPV vaccine 2Sustained efficacy, immunogenicity, and safety for GlaxoSmithKline's HPV vaccine 3Free pores for molecule transport 2
... 2012 Scientists from the Florida campus of The Scripps ... the National Institute on Drug Abuse of the National Institutes ... relapse in smokers who are kicking the habit. The ... is designed to support an institutionally based research program with ...
... fish species can decline while others may grow, reveals new ... in fish. The gastrointestinal system in fish is much ... even be a limiting factor for the distribution of species, ... looking at how gut function in various fish species is ...
... Conn., May 14, 2012 /PRNewswire-iReach/ -- Global ... reports on RNA interference (RNAi) and its relationship with ... Global Industry Analysts, new RNA Interference ... forecasts for drug discovery and target validation, reagents, and ...
Cached Biology News:Scripps Florida scientists awarded $8.4 million grant to develop new anti-smoking treatments 2The gut could reveal effect of climate change on fish 2Understanding the RNAi Reagents Market Overlap with Drug Discovery and Therapeutic Development is Critical for Pharmaceutical Leaders 2
(Date:7/31/2014)... , the leading life sciences employment and news website, launched the ... Illinois , Indiana , ... , Minnesota , Missouri , ... Wisconsin . BioMidwest is a leader in biotech and ... in this region in 2013. The life sciences sector in this area ...
(Date:7/31/2014)... a good reason people over 60 are not donor ... and weakens with time, making the elderly prone to ... Francisco research team now has discovered a reason why. ... the inability of blood-forming cells to maintain blood production ... molecular defects that could be restored for rejuvenation therapies," ...
(Date:7/31/2014)... see through organs and even the entire body to ... cellular structures has been a long-time dream of biologists. ... 31st in the journal Cell has now ... making opaque organs, bodies, and human tissue biopsies transparent, ... protocols could pave the way for a better understanding ...
(Date:7/31/2014)... BLOOMINGTON, Ind. -- Chemists at Indiana University Bloomington ... in bricks-and-mortar fashion, a development with potential value ... as field-effect transistors and photovoltaic cells. , Their ... 3D Crystalline Solids and 2D Self-Assembled Crystals," has ... a journal of the Royal Society of Chemistry. ...
Breaking Biology Technology:Midwest Biotech Leaders Featured On BioSpace Map 2Key to aging immune system is discovered 2See-through organs and bodies will accelerate biomedical discoveries 2Chemists demonstrate 'bricks-and-mortar' assembly of new molecular structures 2Chemists demonstrate 'bricks-and-mortar' assembly of new molecular structures 3
... 16 The Endocrine Society, an,international association focused on ... analysts. The call,originated from ENDO 08, the annual conference ... Francisco. The Society has over 14,000 members from 80,countries, ... the latest,advances in endocrine research and clinical care., ...
... Anesiva,Inc. (Nasdaq: ANSV ) today announced the appointment ... a member of the company,s board of,directors, effective June ... as chief executive officer and member of the Anesiva ... to the,company., "Michael is the ideal person to ...
... today announced,the appointment of Rudy Mazzocchi as its ... responsible for leveraging the company,s novel,technology to find ... with,impaired vision have access to NovaVision(R) Vision Restoration ... bringing new medical technologies,and devices to market that ...
Cached Biology Technology:'Breakthroughs Ahead,' Endocrine Society Tells Security Analysts 2Anesiva Names Michael L. Kranda as President, Chief Executive Officer and Member of Its Board of Directors 2Anesiva Names Michael L. Kranda as President, Chief Executive Officer and Member of Its Board of Directors 3NovaVision Appoints Medical Technology Veteran Rudy Mazzocchi as Chief Executive Officer 2NovaVision Appoints Medical Technology Veteran Rudy Mazzocchi as Chief Executive Officer 3
... This CLS number is ... to easily match Cornings product ... yet, please order under the ... contact customer service for assistance. ...
... Invasion Assay is designed to determine the ... a significant barrier to invasion or to ... a convenient, high-throughput, 96-well format. The 8 ... types of adherent cells such as epithelial, ...
... GrabIt™ Kits are designed for the study ... a pull-down method. Proteins that interact with ... fusion proteins are copurified using affinity resins ... retained on a spin filter. The complexes ...
Kit containing MACS equipment and reagents for immunopurification of proteins....
Biology Products: