Navigation Links
Atomic-level snapshot catches protein motor in action
Date:11/24/2009

e x-ray beams and the experimental capabilities at Beamline 8.3.1 were critical to our success," says Berger, one of the scientific spokespersons for the beamline.

What Berger and Thomsen found from their structural studies was that nucleic-acid binding elements in the interior of the Rho ring spiral around six bases of RNA. When the ATP binding sites that are coupled to this RNA segment release their chemical energy through hydrolysis of the nucleotide, they do so in a sequential manner that propagates around the hexameric ring. This chemical energy is converted into mechanical motion that dictates the rotational direction of the Rho motor based on the firing order of the ATP sites.

"Think of it like the cylinders in a radial engine," Berger says. "The fuel and intake come in from one side, leading to motions that cause the cylinders to spin around a central RNA camshaft. However, because the cylinders actually lie out of plane, they walk along the camshaft as they move."

In their study, Berger and Thomsen found that nature has evolved a similar rotary mechanism for the papillomavirus E1 protein, an AAA+ family hexameric helicase. Their analysis showed that E1 motor moves in the opposite direction along a nucleic chain because the rotational firing order of ATP sites is actually reversed. Determining the molecular structure of protein motors and learning how they operate is critical not only to basic understanding of the molecular principles that control the cell, but also to aiding pharmaceutical drug discovery efforts.

"DNA and RNA are large and cumbersome macromolecular polymers which present a challenge to the molecular machines that need to access their genetic information," says Berger. "There have been two other proposed models for these protein motors in addition to the rotary, one a type of putt-putt motor, in which all the active binding elements hydrolyze ATP simultaneously, and the other a stochastic model, whereby A
'/>"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Purdue researchers obtain a snapshot clarifying how materials enter cells
2. Structural biology scores with protein snapshot
3. Protein chatter linked to cancer activation
4. Scientists link fragile X tremor/ataxia syndrome to binding protein in RNA
5. Researchers identify proteins involved in new neurodegenerative syndrome
6. Low levels of key protein may indicate pancreatic cancer risk
7. Structure of 450 million year old protein reveals evolutions steps
8. Scientists retrace evolution with first atomic structure of an ancient protein
9. Specific brain protein required for nerve cell connections to form and function
10. NIH awards researcher $1.5 million new innovator grant for fruit-fly studies of prion proteins
11. Interacting protein theory awaits test from new neutron analysis tools
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Atomic-level snapshot catches protein motor in action
(Date:9/17/2014)... learned a great deal about complex social behavior by ... something to teach too. , With their unusually large ... parrots live in a complex social environment---not merely in ... or ants, but in a dynamic setting of alliances ... intelligent mammals: dolphins, whales, primates, and social carnivores, like ...
(Date:9/16/2014)... Environmental Health at the Mailman School of Public Health ... asthma and prenatal exposure to two phthalates used in ... in the journal Environmental Health Perspectives . ... higher levels of the chemicals, butylbenzyl phthalate (BBzP) and ... percent increase in risk of developing asthma between age ...
(Date:9/16/2014)... CLEVELAND, Ohio (September 17, 2014)The North American Menopause ... for the comprehensive care of midlife womenon everything ... feature, "The North American Menopause Society Recommendations for ... today in the Society,s journal Menopause . ... recommendations for the care of midlife women freely ...
Breaking Biology News(10 mins):Being social: Learning from the behavior of birds 2Phthalates heighten risk for childhood asthma 2Phthalates heighten risk for childhood asthma 3
... A team of scientists from the University Hospitals of ... bowel diseases have low bone mass and poor bone architecture ... at increased risk of fracture. Inflammatory bowel disease ... inflammation of the bowel. Two of the most common disorders ...
... new study presented today at the World Congress on ... a commonly used injectible contraceptive, is associated with higher ... in combination with estrogens. Depot medroxyprogesterone acetate ... birth control drug which is injected every 3 months. ...
... muscle tissue experiences trauma or disease, such as ... as "satellite cells" respond to repair and regenerate ... neuromuscular diseases, such as muscular dystrophy, which affect ... researchers have used time-lapse photography to document satellite ...
Cached Biology News:Caught on tape: Muscle stem cells captured on video by MU researcher 2
(Date:9/17/2014)... FORT LAUDERDALE, Fla. , Sept. 17, 2014 ... signed an agreement to form a Special Purpose Vehicle in ... based Jatropha centric agro energy company. The SPV shall ... U.S. registered entity with AFAI as majority shareholder. The SPV ... Africa , particularly Ethiopia . ...
(Date:9/17/2014)... RXi Pharmaceuticals Corporation (NASDAQ: ... developing and commercializing innovative therapies addressing major unmet ... has been granted a patent by the United ... delivery system for delivering its "original" RNAi compounds ... treatment of diseases with an inflammatory component. Potential ...
(Date:9/17/2014)... CA (PRWEB) September 17, 2014 Escape Alert, ... for pets which will alert owners if their pet has ... GPS from an implanted microchip in the pet’s body. This ... microchips for pets have been around for many years, they ... are not able to track a pet’s location or alert the ...
(Date:9/17/2014)... (PRWEB) September 17, 2014 The ... committed to lowering the barriers to innovation in ... the appointment of Carmen Nitsche as Executive Director ... to expand its global reach. , Carmen joins ... Vice President, Corporate Development. At Accelrys, she managed ...
Breaking Biology Technology:AFAI Signs Joint Venture Agreement With Jatro Greentech Inc. 2AFAI Signs Joint Venture Agreement With Jatro Greentech Inc. 3RXi Pharmaceuticals Strengthens Intellectual Property Portfolio 2RXi Pharmaceuticals Strengthens Intellectual Property Portfolio 3RXi Pharmaceuticals Strengthens Intellectual Property Portfolio 4Implantable Microchip for Pets with GPS Tracking - Patent Filed by Escape Alert, LLC. 2Implantable Microchip for Pets with GPS Tracking - Patent Filed by Escape Alert, LLC. 3Pistoia Alliance Expands Business Development with Appointment of Carmen Nitsche 2
... photonics and renewable energy will be the focus of ... to 14, 2009 at McMaster University in Hamilton, Ontario, ... in conjunction with the event. , The 4th Nano ... the 14th Canadian Semiconductor Technology Conference (CSTC2009) will bring ...
... UC Riverside have made an accidental discovery in ... information in computers can be transported or stored. ... electrons possess that makes them behave like tiny ... of spin-based semiconductor technology such as ultrahigh-speed computers. ...
... programs give sponsors easy-to-use tools to store, mine and ... transfer knowledge base to ensure enrollment success, NEWTON, ... technology leader, announced the release of a new,product, "Center ... in-house recruitment capabilities for clinical,trial sponsors. The goal is ...
Cached Biology Technology:Joint nanotechnology forum to focus on electronics, photonics, renewable energy 2Discovery by UC Riverside physicists could enable development of faster computers 2Discovery by UC Riverside physicists could enable development of faster computers 3TCN e-Systems Offers Trial Sponsors Solutions for Creating In-House Center of Excellence in Patient Recruitment 2TCN e-Systems Offers Trial Sponsors Solutions for Creating In-House Center of Excellence in Patient Recruitment 3TCN e-Systems Offers Trial Sponsors Solutions for Creating In-House Center of Excellence in Patient Recruitment 4
Anti-ADAM-12 (Meltrin Alpha); amino terminal region; rabbit host...
Mouse monoclonal [3G8] to MDMA ( Abpromise for all tested applications)....
Fluorescein isothiocyanate (FITC) mouse anti-human IFN-alpha2 25 tests...
Rabbit Anti-melatonin (different linkage) Polyclonal Antibody...
Biology Products: