Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

How soft corals defy their environment

17.08.2011
Protein favors calcite formation in aragonite sea

Calcium carbonate is a salt for all seasons. It turns up not only in marble, but also in biogenic sediments such as limestone and coral reefs – and even in pearls. The compound exists in two major crystalline forms, as calcite or aragonite. However, it is not clear what determines which variant an organism will exploit under conditions in which both forms can precipitate.

A team of researchers led by LMU geobiologist Dr. Azizur Rahman, who is also a Research Fellow of the Alexander von Humboldt Foundation, has now answered this question, in collaboration with colleagues based at the University of the Ryukyu Islands in Japan. Together, the scientists have shown that, in the soft coral species Lobophytum crissum, a secreted, extracellular protein known as ECMP-67 is the decisive factor that results in the precipitation of calcite, irrespective of the chemical conditions prevailing in the surrounding seawater. “Over the course of Earth’s history, and most probably depending on the relative amounts of dissolved magnesium and calcium ions, either calcite or aragonite has dominated in the world’s oceans,” says Professor Gert Wörheide, one of the authors of the new study.

Current conditions favor the formation of aragonite, and many stony corals build their skeletons exclusively from this material. However, thanks to ECMP-67, Lobophytum crassum can still produce calcite in an aragonite sea. “We have also been able to show how the extracellular protein ECMP-67 contributes to the production of calcite at the molecular level,” says Rahman. “These findings should also allow us to elucidate the crystal structure of calcite in natural environments.” The study was funded by the Alexander von Humboldt Foundation and the Japanese Society for the Promotion of Sciences. (suwe/PH)

Publication:
Calcite formation in soft coral sclerites is determined by a single reactive extracellular protein
Azizur Rahman, Tamotsu Oomori and Gert Wörheide
Journal of Biological Chemistry 286: 31638-31649; 2 September 2011
Doi 10.1074/jbc.M109.070185
Contact:
Dr. Azizur Rahman
Department of Earth and Environmental Sciences, Paleontology and Geobiology
LMU Munich
Phone: +49 89 / 2180 6711
Email: a.rahman@lrz.uni-muenchen.de

Dr. Kathrin Bilgeri | EurekAlert!
Further information:
http://www.palmuc.de
http://www.uni-muenchen.de

Further reports about: Azizur ECMP-67 Lobophytum cellular protein coral reef natural environment

More articles from Life Sciences:

nachricht The interactome of infected neural cells reveals new therapeutic targets for Zika
23.01.2017 | D'Or Institute for Research and Education

nachricht Ion treatments for cardiac arrhythmia — Non-invasive alternative to catheter-based surgery
20.01.2017 | GSI Helmholtzzentrum für Schwerionenforschung GmbH

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

The interactome of infected neural cells reveals new therapeutic targets for Zika

23.01.2017 | Life Sciences

Melting solid below the freezing point

23.01.2017 | Materials Sciences

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>