Navigation Links
Researchers pin down long-elusive protein that's essential to 'life as we know it'
Date:1/4/2010

A team of researchers is being recognized for devising a new way to study a human protein that long has evaded close scrutiny by scientists investigating its role in the communication of important genetic messages inside a cell's nucleus to workhorse molecules found elsewhere.

Last year, the team, led by J. Andrew Hockert, at the time a doctoral researcher at the Texas Tech University Health Science Center School of Medicine, put in its crosshairs the protein known as CstF-64. Today, in what has been named a "Paper of the Week" for the Jan. 1 issue of the Journal of Biological Chemistry, the team is reporting its successes.

Short for "cleavage stimulation factor-64," CstF-64 carries out countless activities required to keep its parent cell alive and well. Hockert's team was particularly interested in the protein because it controls polyadenylation, an essential step in gene communication that involves tacking on information to genetic messages.

For years, CstF-64 refused to give up its secrets when scientists zeroed in. The protein has so many important duties that tweaks prompted a sort of murder-suicide: It killed its own parent cell and, so, died with it.

"Previously, it had been very hard to examine the functions of most of the polyadenylation proteins in cells because polyadenylation is essential for 'life as we know it.' If we perturbed polyadenylation in any way, the cells died, and we could not measure anything," says Hockert, who is now an assistant professor at the University of the Cumberlands in Williamsburg, Ky.

Undeterred, Hockert set out to observe in a living cell how the elusive CstF-64 gets from its home base in the cytoplasm, or outer region of a cell, and into the nucleus, where genetic messages originate.

For CstF-64, it's all about location, location, location. Only once in the nucleus can it start doing its job in the polyadenylation process, getting the messages ready to be taken out to worker molecules in the cytoplasm.

But to make his observations, Hockert had to employ what co-investigator Clinton MacDonald calls "a trick."

"Andrew realized we can make a version of the protein that is different than the regular version already in the cell. We can mutate it," says MacDonald, an associate professor at Texas Tech who oversaw Hockert's work. "And, if you put that mutated version of the protein in the cell, it only works on the genes we tell it to work on and not the rest. So, it doesn't kill the cell."

Having come up with a clever way to study and measure different aspects of the protein in a living cell, MacDonald says, the team then had to pick one in particular on which to focus.

"The feature Andrew chose to examine was how CstF-64 interacted with another polyadenylation protein and how that interaction allowed both those proteins to work inside the nucleus," MacDonald says.

As important as CstF-64 is to gene expression, it doesn't exactly have "VIP" status when it comes to gaining access to the nucleus. Lacking what is known as a nuclear localization signal, it has to rely on its partner protein, CstF-77, to lead the way to and get in the door.

"We already knew the sequence of our protein, CstF-64, and so we knew it didn't have a special signal to get it in the nucleus. So, we hypothesized something else was dragging it in, and the most likely thing was a partner protein working alongside it," Hockert explains.

With the mutant version of the protein in place, the team soon discovered their hypothesis was correct: CstF-64 had to bind with CstF-77 to get into the cell's command center. Furthermore, MacDonald says, the team was able to report which piece of CstF-64 binds with its partner "the hinge domain."

Having overcome the cell-death obstacle and having confirmed the significance of the "hinge" domain for nuclear localization, the researchers expect their technique will be used by future scientists to monitor a variety of protein-protein interactions in living cells and better understand the cell's polyadenylation machinery.


'/>"/>

Contact: Angela Hopp
ahopp@asbmb.org
301-634-7389
American Society for Biochemistry and Molecular Biology
Source:Eurekalert  

Related biology news :

1. Researchers identify proteins involved in new neurodegenerative syndrome
2. Texas researchers and educators head for Antarctica
3. MGH researchers describe new way to identify, evolve novel enzymes
4. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
5. U of MN researchers discover noninvasive diagnostic tool for brain diseases
6. U of Minnesota researchers discover noninvasive diagnostic tool for brain diseases
7. Researchers discover new strategies for antibiotic resistance
8. Researchers find new taste in fruit flies: carbonated water
9. Binghamton University researchers investigate evolving malaria resistance
10. UIC researchers find promising new targets for antibiotics
11. Researchers develop simple method to create natural drug products
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers pin down long-elusive protein that's essential to 'life as we know it'
(Date:4/5/2017)... -- Today HYPR Corp. , leading innovator in ... the HYPR platform is officially FIDO® Certified . ... that empowers biometric authentication across Fortune 500 enterprises and ... 15 million users across the financial services industry, however ... suites and physical access represent a growing portion of ...
(Date:4/4/2017)... YORK , April 4, 2017   EyeLock ... today announced that the United States Patent and Trademark ... patent broadly covers the linking of an iris image ... same transaction) and represents the company,s 45 th ... latest patent is very timely given the multi-modal biometric ...
(Date:3/30/2017)... 2017  On April 6-7, 2017, Sequencing.com will host ... hackathon at Microsoft,s headquarters in Redmond, ... on developing health and wellness apps that provide a ... Genome is the first hackathon for personal genomics ... companies in the genomics, tech and health industries are ...
Breaking Biology News(10 mins):
(Date:5/23/2017)... ... May 23, 2017 , ... A recent survey conducted by the Weed ... to control weed in 12 categories of broadleaf crops, fruits and vegetables, while common ... the U.S. and Canada participated in the 2016 survey, the second conducted by WSSA. ...
(Date:5/23/2017)... ... May 23, 2017 , ... Vortex Biosciences , provider ... isolation of prostate circulating tumor cells using Vortex microfluidic technology ” in Nature Precision ... collaboration with Dr. Dino Di Carlo and Dr. Matthew Rettig at the University of ...
(Date:5/23/2017)... (PRWEB) , ... May 23, 2017 , ... ... machine manufacturers to re-engineer their control technology again and again. METTLER TOLEDO has ... for machine manufacturers. The videos illustrate how integration of the ACT350 into Siemens ...
(Date:5/21/2017)... San Diego, CA (PRWEB) , ... May 20, ... ... decision support tool that helps avoid the lengthy trial and error process by ... for patients. It can also strengthen the doctor-patient relationship through a personalized ...
Breaking Biology Technology: