Navigation Links
ATP splitting in membrane protein dynamically measured for the first time
Date:7/11/2012

Bochum, 11.7.2012 No. 242

Tracked step for step ATP splitting in membrane protein dynamically measured for the first time RUB researchers report in the Journal of Biological Chemistry

How a transport protein obtains its driving force from the energy storage molecule ATP, has been tracked dynamically by RUB researchers. Using time-resolved infrared spectroscopy, they measured the structural changes in the bacterial membrane protein MsbA and its interaction partner ATP. The researchers led by Prof. Dr. Eckhard Hofmann and Prof. Dr. Klaus Gerwert from the Biophysics Department report on the results in the current issue of the Journal of Biological Chemistry.

Transport proteins are associated with various diseases

ABC transporters are membrane proteins that transport various substances from one side of the cell membrane to the other. The driving force for this is provided by the molecule ATP, a universal energy storage of the cells. ATP has three phosphate groups. If one of these splits off, energy is released. The transporters are of great medical significance as they play a central role in the multi-drug resistance of cancer cells to chemotherapeutic substances and are associated with various inherited diseases like cystic fibrosis. In recent years, researchers have uncovered the 3D structures of several of these transporters at the atomic level. Although the architecture of the nanomachines is known, a detailed understanding of how the splitting of the energy carrier ATP dynamically enables the transport of various substances across biological membranes has so far been lacking.

Protein controls ATP splitting

The Bochum researchers have now dynamically tracked the ATP splitting, called hydrolysis, for the first time in the fat transporter MsbA from the bacterium Escherichia coli. Using fourier transform infrared spectroscopy, they studied the motor domains of MsbA, i.e. the part of the protein where the ATP splitting takes place. Using this method, researchers can track minute changes in the protein in the range of nanoseconds. Simultaneously, the method also records changes in the molecules the protein interacts with - in this case ATP.

Phosphate signals reveal what happens during the splitting

The big challenge presented by the data analysis is to assign the signals in the measured spectrum to specific molecules or molecular groups. If this is successful, you can see which groups of molecules are structurally changed and when. The biophysicists marked the phosphate groups of the ATP molecule, so that they left characteristic signals in the spectrum. In this way they tracked, how ATP bound to the transport protein, how one of its three phosphate groups split off and was released into the environment without first latching back on to the protein. "Our data also provides important clues as to how the protein moves during ATP hydrolysis. This lays the foundation for the study of the whole membrane protein, which we are going to tackle next", says Professor Hofmann. The investigations were supported by the Protein Research Department at the RUB and funds of the collaborative research centre SFB 642 "GTP and ATP dependent membrane processes", whose speaker is Prof. Dr. Klaus Gerwert.


'/>"/>
Contact: Prof. Dr. Eckhard Hofmann
eckhard.hofmann@bph.rub.de
49-234-322-4463
Ruhr-University Bochum
Source:Eurekalert

Related biology news :

1. Advanced Membrane Technology V Conference
2. Patel recognized with NSF Career Award for computer-modeling research on cell membranes
3. Symposium: Protein-Folding Diseases: Models & Mechanisms
4. TLR1 protein drives immune response to certain food-borne illness in mice
5. The appetite-suppressing effect of proteins explained
6. How a protein meal tells your brain you’re full
7. Strawberries activate protection protein to prevent cardiovascular disease
8. Innate immune system protein provides a new target in war against bacterial infections
9. Single protein promotes resistance to widely used anti-estrogen drugs
10. Fibrous Protein Nanocomposites Conference
11. MARC Travel Awards announced for the 26th Annual Symposium of the Protein Society
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/24/2017)... 24, 2017 Janice Kephart , ... Identity Strategy Partners, LLP (IdSP) , today issues ... President Trump,s March 6, 2017 Executive Order: ... vetting can be instilled with greater confidence, enabling ... all refugee applications are suspended by until at ...
(Date:4/17/2017)... 17, 2017 NXT-ID, Inc. (NASDAQ: NXTD ... filing of its 2016 Annual Report on Form 10-K on Thursday ... ... available in the Investor Relations section of the Company,s website at ... website at http://www.sec.gov . 2016 Year Highlights: ...
(Date:4/11/2017)... PALM BEACH GARDENS, Fla. , April 11, ... biometric identity management and secure authentication solutions, today ... million contract by Intelligence Advanced Research Projects Activity ... technologies for IARPA,s Thor program. "Innovation ... the onset and IARPA,s Thor program will allow ...
Breaking Biology News(10 mins):
(Date:10/10/2017)... , Oct. 10, 2017 International research firm Parks ... Strategy, will speak at the TMA 2017 Annual Meeting , October ... trends in the residential home security market and how smart safety and ... Parks ... "The residential ...
(Date:10/10/2017)... ... October 10, 2017 , ... The Pittcon Program Committee ... honoring scientists who have made outstanding contributions to analytical chemistry and applied ... the world’s leading conference and exposition for laboratory science, which will be held ...
(Date:10/9/2017)... (PRWEB) , ... October 09, 2017 , ... At its ... Dr. Christopher Stubbs, a professor in Harvard University’s Departments of Physics and Astronomy, has ... was a member of the winning team for the 2015 Breakthrough Prize in Fundamental ...
(Date:10/7/2017)... ... October 06, 2017 , ... ... and applications consulting for microscopy and surface analysis, Nanoscience Instruments is now ... Analytical offers a broad range of contract analysis services for advanced applications. ...
Breaking Biology Technology: