Navigation Links
Keep your distance! Why cells and organelles don't get stuck
Date:8/30/2012

Biomembranes enclose biological cells like a skin. They also surround organelles that carry out important functions in metabolism and cell division. Scientists have long known in principle how biomembranes are built up, and also that water molecules play a role in maintaining the optimal distance between neighboring membranesotherwise they could not fulfill their vital functions. Now, with the help of computer simulations, scientists of the Technische Universitt Mnchen (TUM) and the Freie Universitt Berlin have discovered two different mechanisms that prevent neighboring membrane surfaces from sticking together. Their results appear in the Proceedings of the National Academy of Sciences.

Biomembranes consist of lipids, chain-like fat molecules stacked side by side. In the aqueous environment of cells, the lipids organize themselves into a so-called bilayer with fat-soluble "hydrophobic" ends of the molecular chains facing inward and water-soluble "hydrophilic" ends facing outward. If the water-soluble surfaces of two membranes come too close to each other, a pressure is generatedhydration repulsionthat prevents the membrane surfaces from touching. Between two intact biomembranes there is always a film of water just a few nanometers thick. Until now, however, it was unclear how hydration repulsion works on the molecular level.

By means of complex simulations, the scientists discovered two different mechanisms whose contribution depends on the distance between the membranes. If the membranes are separated by around one nanometer or more, the water molecules play the decisive role in holding them apart. Since they have to orient themselves simultaneously to the lipids of both membrane surfaces, they give up their preferred spatial arrangement. Then they function like "bumpers," pushing the membranes apart. When the separation is smaller, the lipids in the opposing membrane surfaces mutually inhibit their own mobility, and the repulsive f
'/>"/>

Contact: Patrick Regan
regan@zv.tum.de
49-089-289-10515
Technische Universitaet Muenchen
Source:Eurekalert  

Page: 1 2

Related biology news :

1. Tortoise and the hare: New drug stops rushing cancer cells, slow and steady healthy cells unharmed
2. Stem cells can repair a damaged cornea
3. Scientists produce eye structures from human blood-derived stem cells
4. Study demonstrates cells can acquire new functions through transcriptional regulatory network
5. Epigenetic signatures direct the repair potential of reprogrammed cells
6. Researchers print live cells with a standard inkjet printer
7. Nanopills release drugs directly from the inside of cells
8. Protein jailbreak helps breast cancer cells live
9. Newly found protein helps cells build tissues
10. BU researchers derive purified lung and thyroid progenitors from embryonic stem cells
11. Housekeeping mechanism for brain stem cells discovered
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Keep your distance! Why cells and organelles don't get stuck
(Date:2/24/2015)... This report analyzes the worldwide markets for Iris ... for the US, Canada , ... Asia-Pacific , Middle East , and ... are provided for the period 2013 through 2020. Also, a ... and analytics are derived from primary and secondary research. Company ...
(Date:2/24/2015)... Feb. 24, 2015 Research and Markets ... of the "Global 2D Gesture Recognition Market ... The analysts forecast the Global 2D Gesture ... 32.12% over the period 2014-2019 The ... sectors is one of the major trends in ...
(Date:2/19/2015)... --Research and Markets ( http://www.researchandmarkets.com/research/kx9zp8/military ) ... Electro-Optical / Infrared Systems Market by Type, by ... to 2020" report to their offering. ... expected to reach $16.35 billion by 2020, to ... report segments the military electro-optical/infrared systems market on ...
Breaking Biology News(10 mins):World Iris Biometrics Industry 2World Iris Biometrics Industry 3World Iris Biometrics Industry 4World Iris Biometrics Industry 5World Iris Biometrics Industry 6World Iris Biometrics Industry 7World Iris Biometrics Industry 8World Iris Biometrics Industry 9World Iris Biometrics Industry 10World Iris Biometrics Industry 11Global 2D Gesture Recognition Market 2015-2019 with Cognitec Systems, CogniVue, eyeSight Mobile Technologies & PointGrab Dominating 2Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 2Military Electro-Optical / Infrared Systems (Image Intensification, Laser, Infrared) Market - Forecast to 2020: Featuring Profiles of the Market Leaders on this $16 Billion market 3
... team of researchers, including scientists from Woods Hole Oceanographic ... ice-covered Arctic waters. Until now, sea ice was thought ... marine plants living under the ice. The amount ... times greater than the amount found in neighboring ice-free ...
... scientists have been working to produce a biodegradable alternative ... researcher is giving the quest for environmentally friendly plastics ... than ever before. Prof. Moshe Kol of ... one of the world,s most commonly used plastics ...
... , A recent report released by the National Science ... grew substantially in the past decade. Approximately 632,700 ... programs in the United States as of fall 2010. ... in 2000, according to the National Science Foundation,s Survey ...
Cached Biology News:Scientists discover huge phytoplankton bloom in ice-covered waters 2Scientists discover huge phytoplankton bloom in ice-covered waters 3Steel-strength plastics -- and green, too! 2Steel-strength plastics -- and green, too! 3
(Date:3/3/2015)... , March 3, 2015  Neurocrine Biosciences, Inc. (Nasdaq: ... Gorman , President and Chief Executive Officer of Neurocrine ... Conference in Miami.   The live presentation ... (7:15am PT).  The presentation will be webcast and may ... .   Listeners are encouraged to visit ...
(Date:3/3/2015)... 3, 2015  Regenicin, Inc. (OTC Bulletin Board: ... development of and commercialization of regenerative cell therapies to ... today that it has received the final payment to ... Inc. (OTC Bulletin Board: AMBS ). ... the final payments due to Regenicin in the amount ...
(Date:3/3/2015)... , March 3, 2015  Thingee Corporation, a ... be delivering a presentation entitled, "Technology Adoption: Making Reps, ... Thriving through Innovations and Technology ,  in ... 11 to 13, 2015. Audiences looking to learn how ... will want to be in the audience for the ...
(Date:3/3/2015)... 03, 2015 Genedata, a leading ... and life science research, today announced that Pfizer ... platform for use at Pfizer biopharma research and ... is supporting Pfizer’s global deployment and roll out ... for Therapeutic Innovation (CTI), and Pharmaceutical Sciences groups. ...
Breaking Biology Technology:Regenicin (RGIN) Receives $2.3 Million in Final Payment from Amarantus 2Regenicin (RGIN) Receives $2.3 Million in Final Payment from Amarantus 3Thingee to present at 11th Annual Synergistix Users Conference 2Genedata Biologics Licensed by Pfizer Inc. 2Genedata Biologics Licensed by Pfizer Inc. 3
... among Midwestern states when it comes to health-care venture ... Venture Investment Report. , ,Released by BioEnterprise, it looked ... in the Midwest area. Minnesota topped the list with ... ,These aren't comprehensive numbers, since not all firms report ...
... with headquarters in Madison, said it has agreed to trade ... ,In exchange for acquiring most of the customers Integra Telecom ... Fargo and Grand Forks in North Dakota, and Little Falls, ... state approval, the deal is expected to close within 90 ...
... long weekend at the Santa Fe Workshops , the renowned ... full disclosure, I was the guest of a very gracious Kodak. ... group of us who write and talk about digital imaging to ... while along the way becoming more familiar with the Kodak ...
Cached Biology Technology:Photography is in the seeing, not the technology 2Photography is in the seeing, not the technology 3
Phospho-TAO2 (S181) Affinity Purified Polyclonal Ab Protein Family: Other Intracellular Kinases...
PEG 8000, Molecular Biology Grade...
... Histone Deacetylase (HDAC) Antibody Sampler Kit ... (HDAC1) Antibody, Catalog #2062, 40 ul Histone ... ul Histone Deacetylase 4 (HDAC4) Antibody, Catalog ... Antibody, Catalog #2082, 40 ul Histone Deacetylase ...
Immunogen: Synthetic Peptide: C N(185) D G T E F G G S I Y Q K(197) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Biology Products: