Navigation Links
Rice, UCSD scientists probe form, function of mysterious protein
Date:1/27/2012

HOUSTON -- (Jan. 26, 2012) -- Like a magician employing sleight of hand, the protein mitoNEET -- a mysterious but important player in diabetes, cancer and aging -- draws the eye with a flurry of movement in one location while the subtle, more crucial action takes place somewhere else.

Using a combination of laboratory experiments and computer modeling, scientists from Rice University and the University of California, San Diego (UCSD) have deciphered part of mitoNEET's movements to get a better understanding of how it handles its potentially toxic payload of iron and sulfur. Their research is described this week in the Proceedings of the National Academy of Sciences.

"We scrutinize proteins with an unconventional approach," said Jos Onuchic, Rice's Harry C. and Olga K. Wiess Professor of Physics and Astronomy and co-director of the Center for Theoretical Biological Physics. "We use biophysics to probe biology rather than the other way around. Using computational theory, we find structures that are possible -- regardless of whether they've already been observed experimentally -- and we ask ourselves whether these structures might be biologically significant."

Study co-leader Patricia Jennings, professor of chemistry and biochemistry at UCSD, who has collaborated with Onuchic for 15 years, said they save a great deal of time by using structural biophysics to guide their experiments on a wide variety of targets. For example, Jennings' laboratory determined less than five years ago that mitoNEET contained a novel folded structure. Since then, her lab has been using insights gained from static and dynamic snapshots of the protein to guide biological and biochemical studies.

"I think people forget that proteins are machines with moving parts," said study lead author Elizabeth Baxter, a UCSD graduate student who works under the guidance of both Onuchic and Jennings. "We start with the static snapshot and model in the functional motions."

MitoNEET, which binds to the diabetes drug, Actos, immediately caught the attention of researchers when it was discovered. It has a unique ability to bind and store iron-based molecules in an iron-sulfur cluster. Iron is an essential element for all life, but it is also highly toxic, and mitoNEET is the only iron-handling protein that is known to sit on the wall of the mitochondria, one of the key structures inside a cell.

The protein's biological functions are still being unraveled. Interestingly, scientists have shown that mitoNEET sits on the outer mitochondrial wall with its potentially toxic payload of iron-sulfur molecules facing toward the cell's cytoplasm, the gel-like fluid that fills the cell. Discovery of the unique binding mode of the protein's iron-sulfur cluster led the Jennings group to show that the cluster can be delivered into the mitochondria. In addition, its sister protein interacts with proteins that participate in apoptosis -- the process cells use to kill themselves when they are no longer viable.

"I think mitoNEET is a protein that could be your best friend or your worst enemy," Jennings said. "There's some evidence that it may act as a sensor for oxidative stress and that it can lose its toxic iron-sulfur cluster under stress conditions. Depending upon where the iron ends up, that could lead to drastic problems inside the cell."

Proteins are strands of amino acids that are produced from DNA blueprints, but their shapes can provide important clues about their function. To find out how mitoNEET's control and release of its iron-sulfur payload might be related to its shape, Baxter used computer simulations to study how the protein folds, as well as the functional motions of two similar shapes that could be biologically important. In one of these shapes, there is a slight intertwining of two arms that extend away from the iron-cluster pocket. In the other, the arms also extend but are not intertwined.

Baxter found that both conformations were physically possible. She also found the protein could switch between the "strand-swapped" and "strand-unswapped" conformations without entirely unfolding. Moreover, this change in the twining of the arms was shown to alter the shape of the critical pocket that holds the iron-sulfur cluster; this makes the cluster more likely to be inserted or released in situations where the arms are untwined.

Like the magician using misdirection, the loosening of the grip on the cluster is subtle and happens in a different location than the flurry of arm motions. Jennings said it's the kind of thing that could easily be missed if the focus of the study were the cluster itself.

Onuchic said, "One of the advantages to our approach is that it allows us to look for relevant biophysical properties that control distant functional regions -- like mitoNEET's strand-swapping -- that can easily be missed with a more conventional approach."


'/>"/>

Contact: Jade Boyd
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert  

Related biology news :

1. Jefferson scientists deliver toxic genes to effectively kill pancreatic cancer cells
2. Scientists identify novel inhibitor of human microRNA
3. Argonne scientists peer into heart of compound that may detect chemical, biological weapons
4. MU scientists go green with gold, distribute environmentally friendly nanoparticles
5. Scientists identify gene that may contribute to improved rice yield
6. Scientists discover why a mothers high-fat diet contributes to obesity in her children
7. MU scientists see how HIV matures into an infection
8. Earth scientists keep an eye on Texas
9. Thinking it through: Scientists call for policy to guide biofuels industry toward sustainability
10. Scientists identify a molecule that coordinates the movement of cells
11. Scientists Find new migratory patterns for Mediterranean and Western Atlantic bluefin tuna
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Rice, UCSD scientists probe form, function of mysterious protein
(Date:4/5/2017)... April 5, 2017 Today HYPR Corp. ... the server component of the HYPR platform is officially ... the end-to-end security architecture that empowers biometric authentication across ... has already secured over 15 million users across the ... of connected home product suites and physical access represent ...
(Date:3/30/2017)... 30, 2017 The research team of The ... (3D) fingerprint identification by adopting ground breaking 3D fingerprint minutiae recovery ... of speed and accuracy for use in identification, crime investigation, immigration ... ... A research team ...
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. Mohamed Anwar ... prestigious international IAIR Award for the most innovative high security ePassport and ... ... Maldives Immigration Controller General, Mr. Mohamed ... the right) have received the IAIR award for the "Most innovative high ...
Breaking Biology News(10 mins):
(Date:5/24/2017)... ... May 24, 2017 , ... Patient Monitoring ... with Wi-Fi connectivity to reduce the amount of wiring in a healthcare facility ... compact mobile devices including infusion pumps, heart and hypertension monitoring, glucose monitoring, and ...
(Date:5/23/2017)... ... May 23, 2017 , ... Firmex ... solution that makes it easy for organizations to send and gather large files ... FTP software or email file size limitations. , Using the same market-tested ...
(Date:5/23/2017)... , ... May 23, 2017 ... ... an unlimited source of human cardiovascular cells for research and the development ... makes it possible to generate large numbers of cardiomyocytes (hPSC-CMs). Due to ...
(Date:5/23/2017)... ... May 22, 2017 , ... NetDimensions has been ... Aragon Research Globe™ for Corporate Learning, 2017. , Aragon Research defines Leaders as ... and effectively perform against those strategies. NetDimensions’ ranking as a Leader due to ...
Breaking Biology Technology: