Featured Research

from universities, journals, and other organizations

Cheap hydrogen gas? Probing hydrogen catalyst assembly

Date:
January 23, 2014
Source:
University of California - Davis
Summary:
Biochemical reactions sometimes have to handle dangerous things in a safe way. New work shows how cyanide and carbon monoxide are safely bound to an iron atom to construct an enzyme that can generate hydrogen gas.

Biochemical reactions sometimes have to handle dangerous things in a safe way. New work from researchers at UC Davis and Stanford University shows how cyanide and carbon monoxide are safely bound to an iron atom to construct an enzyme that can generate hydrogen gas. The work is published Jan. 24 in the journal Science.

Producing hydrogen with catalysts based on abundant metals, such as iron, is key to hopes of using hydrogen to replace carbon-based fuels. But before you can make hydrogen, you have to make the catalyst that enables the reaction -something bacteria have been able to do for millennia.

Jon Kuchenreuther, a postdoctoral researcher working with Professor Dave Britt, project scientist Simon George and colleagues at the UC Davis Department of Chemistry, with James Swartz and colleagues at Stanford, used a variety of analysis techniques to study the chain of chemical reactions that assembles these catalysts based on clusters of iron and sulfur atoms adorned with cyanide (CN) and carbon monoxide (CO) molecules.

"How does biology make these complicated active sites?" Britt said. "You can't release cyanide or carbon monoxide into the cell. It turns out that it's formed and kept on iron throughout."

In work published in Science last year, the researchers showed that the amino acid tyrosine first binds to the iron/sulfur cluster, and is then split by the enzyme HydG to create a radical. The new paper picks up the story from there, showing that carbon monoxide and cyanide derived from the splitting of tyrosine, remain bound to the same iron atom as the tyrosine radical is removed. This iron/cyanide/carbon monoxide structure becomes part of the final cluster.

The team principally used a technique called Fourier Transform Infra Red spectroscopy to follow the process. FTIR measures vibrations in bond length, and both cyanide and carbon monoxide show strong signals with this method.

Metal atoms in biological molecules are usually bound to large structures, like amino acids or heme groups, Britt said. For metals to be bound to small molecules, like carbon monoxide and cyanide, is "some unusual chemistry by itself," he said.


Story Source:

The above story is based on materials provided by University of California - Davis. Note: Materials may be edited for content and length.


Journal Reference:

  1. J. M. Kuchenreuther, W. K. Myers, D. L. M. Suess, T. A. Stich, V. Pelmenschikov, S. A. Shiigi, S. P. Cramer, J. R. Swartz, R. D. Britt, S. J. George. The HydG Enzyme Generates an Fe(CO)2(CN) Synthon in Assembly of the FeFe Hydrogenase H-Cluster. Science, 2014; 343 (6169): 424 DOI: 10.1126/science.1246572

Cite This Page:

University of California - Davis. "Cheap hydrogen gas? Probing hydrogen catalyst assembly." ScienceDaily. ScienceDaily, 23 January 2014. <www.sciencedaily.com/releases/2014/01/140123142031.htm>.
University of California - Davis. (2014, January 23). Cheap hydrogen gas? Probing hydrogen catalyst assembly. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2014/01/140123142031.htm
University of California - Davis. "Cheap hydrogen gas? Probing hydrogen catalyst assembly." ScienceDaily. www.sciencedaily.com/releases/2014/01/140123142031.htm (accessed July 28, 2014).

Share This




More Matter & Energy News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Carbon Trap: US Exports Global Warming

The Carbon Trap: US Exports Global Warming

AP (July 28, 2014) AP Investigation: As the Obama administration weans the country off dirty fuels, energy companies are ramping-up overseas coal exports at a heavy price. (July 28) Video provided by AP
Powered by NewsLook.com
Shipping Crates Get New 'lease' On Life

Shipping Crates Get New 'lease' On Life

Reuters - Business Video Online (July 25, 2014) Shipping containers have been piling up as America imports more than it exports. Some university students in Washington D.C. are set to get a first-hand lesson in recycling. Their housing is being built using refashioned shipping containers. Lily Jamali reports. Video provided by Reuters
Powered by NewsLook.com
Europe's Highest Train Turns 80 in French Pyrenees

Europe's Highest Train Turns 80 in French Pyrenees

AFP (July 25, 2014) Europe's highest train, the little train of Artouste in the French Pyrenees, celebrates its 80th birthday. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins