Navigation Links
How bacteria change movement direction in response to oxygen: Molecular interactions unravelled
Date:6/25/2012

How single cell organisms like bacteria manage to react to their environment is not yet completely understood. Together with colleagues from Japan, Dr. Samir El-Mashtoly from the RUB Department of Biophysics, led by Prof. Dr. Klaus Gerwert, has gained new insights into the molecular interactions during aerotaxis of Bacillus subtilis, i.e., the dependence of the movement direction on the oxygen concentration in the environment. The research team investigated the conformational changes within the protein HemAT. Via a signal transduction chain, this protein sends a command to the flagellar motor which controls the movement direction. They report in the Journal of Biological Chemistry.

Signal transduction chain

The signal transduction chain starts with binding of oxygen to HemAT's heme domain, which is also known from haemoglobin in the red blood cells and is called the sensor domain of HemAT. Oxygen binding leads to a conformational change in the sensor domain. This in turn provokes several further conformational changes within HemAT that finally affect the signalling domain of the protein. The signalling domain then transmits the information about a rise in oxygen concentration to other proteins within the cell. These proteins forward the message to the motor of the flagellum. The research team investigated how the information travels from the sensor domain of HemAT to its signalling domain.

Protein helices forward the information

For that purpose, Dr. El-Mashtoly used the time-resolved ultraviolet resonance Raman spectroscopic facilities in the Picobiology Institute in Japan. This method provides, for instance, structural information about the conformation of the protein and hydrogen bonding interactions on a nanosecond to microsecond time scale. The results suggest that the conformational change in the sensor domain, i.e., the heme structure, induces the displacement of two protein helices within HemAT. This displacement affects another helix which is continuous with the structure of the signalling domain. Due to a series of conformational changes, the information about oxygen binding thus reaches the signalling domain of the protein.


'/>"/>

Contact: Dr. Samir El-Mashtoly
samir.elmashtoly@bph.rub.de
49-234-322-9833
Ruhr-University Bochum
Source:Eurekalert

Related biology news :

1. Discovery increases understanding how bacteria spread: U of A study
2. Research identifies specific bacteria linked to indoor water-damage and mold
3. Brothers in arms: Commensal bacteria help fight viruses
4. Intestinal bacteria produce neurotransmitter, could play role in inflammation
5. Normal bacterial makeup has huge implications for health, says CU professor
6. Consortium of scientists maps the human bodys bacterial ecosystem
7. More than 1 way to be healthy: Map of bacterial makeup of humans reveals microbial rare biosphere
8. IU role in Human Microbiome Project exposes battle history between bacteria, viruses in human body
9. The activity of a bacterial effector protein seen in molecular detail
10. Light-induced delivery of nitric oxide eradicates drug-resistant bacteria
11. Arctic bacteria help in the search to find life on moon Europa
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/11/2017)... 11, 2017 NXT-ID, Inc. (NASDAQ:   ... announces the appointment of independent Directors Mr. Robin D. ... Board of Directors, furthering the company,s corporate governance and expertise. ... Gino Pereira , ... forward to their guidance and benefiting from their considerable expertise ...
(Date:4/5/2017)... -- KEY FINDINGS The global market for ... of 25.76% during the forecast period of 2017-2025. The ... the growth of the stem cell market. ... INSIGHTS The global stem cell market is segmented on ... stem cell market of the product is segmented into ...
(Date:3/30/2017)... -- The research team of The Hong Kong Polytechnic ... by adopting ground breaking 3D fingerprint minutiae recovery and matching technology, ... accuracy for use in identification, crime investigation, immigration control, security of ... ... A research team led by Dr ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... Singh Biotechnology today ... designation to SBT-100, its novel anti-STAT3 (Signal Transducer and Activator of Transcription 3) ... able to cross the cell membrane and bind intracellular STAT3 and inhibit its ...
(Date:10/10/2017)... (PRWEB) , ... October 10, 2017 , ... ... Science Center’s FirstHand program has won a US2020 STEM Mentoring Award. Representatives of ... award for Excellence in Volunteer Experience from US2020. , US2020’s mission is to ...
(Date:10/10/2017)... , Oct. 10, 2017 SomaGenics announced ... the NIH to develop RealSeq®-SC (Single Cell), expected to ... profiling small RNAs (including microRNAs) from single cells using ... highlights the need to accelerate development of approaches to ... "New techniques for measuring levels of ...
(Date:10/9/2017)... , Oct. 9, 2017  BioTech Holdings announced ... by which its ProCell stem cell therapy prevents ... ischemia.  The Company, demonstrated that treatment with ProCell ... limbs saved as compared to standard bone marrow ... HGF resulted in reduction of therapeutic effect.  ...
Breaking Biology Technology: