[phenixbb] Postdoctoral position in Grenoble, France - Living deep
Eric Girard
eric.girard at ibs.fr
Fri Mar 25 03:45:45 PDT 2011
*Living deep: Structural basis of piezophilic adaptation*
ELMA group. Institut de Biologie Structurale J.-P. Ebel -- Grenoble --
France
http://www.ibs.fr/groupes/groupe-extremophiles-et-grands/
We are recruiting a post-doctoral scientist interested in life
adaptation to extreme conditions. The position is for 2 years and is
funded by the french national agency for research (ANR)
A high-pressure environment characterizes our planet. For more than 60 %
of the biosphere pressure is greater than 100 bars and it can reach 1000
bars in the deepest sea trenches, like the Marianna's trench. However,
in these extreme conditions, a vast biodiversity of adapted
micro-organisms (piezophiles) can be encountered. So far, the molecular
mechanisms that facilitate proteins function under high pressure remain
obscurs. Beside interests to understand fundamental protein folding
processes and life evolution, this information is essential to develop
biotechnological application from deep sea enzymes.
This work will be performed in the framework of a collaborative network
including ENS Lyon and IFREMER-UBO in Brest in which a new archaeon from
the Pyroccoccus phylum was recently discovered and was called Pyrococcus
yayanosii CH1. This microbe is the first obligate piezophile as it is
only able to grow under pressure (optimal growth: 98°C and 520 bars).
The project is based on the study of two protein families, for which the
biochemistry is well handled by the team: large peptidases complexes and
lactate/malate dehydrogenase (LDH/MalDH). These proteins play key roles
in metabolic adaptation to deep sea ecosystem and allow combining
structural approaches (protein crystallography, small-angle
scattering...) and biochemical approaches (oligomer stability, enzymatic
activity measurements...). The candidate will study the molecular
effects of high pressure/temperature by comparing the structural and
functional properties of different proteases and
LDH/MalDH from Thermococcus and Pyrococcus phylums (including Pyrococcus
yayanossi CH1) isolated at various water depths.
The ELMA team possesses a fully-fledged wet laboratory for all
biochemical steps and the project will benefit from privileged access to
large facilities (synchrotron and neutron sources) as well as from
latest developments in high-pressure biophysics: high-pressure protein
crystallography, for which the ELMA team is a world leader, small-angle
x-ray scattering under high-pressure, UV-Visible spectrophotometer and
fluorimeter both equipped with a high-pressure vessel.
The candidate should have a background in biochemistry with a strong
interest in structural approaches or a physico-chemistry background with
a strong interest for biophysics.
Candidatures, including CV, intention letter and the names and contact
information of referees, as well as informal inquiries should be sent to
Eric Girard (eric.girard at ibs.fr) and Bruno Franzetti (bruno.franzetti
at ibs.fr).
Relevant publications from the team:
Coquelle et al (2007) Activity, stability and structural studies of
lactate dehydrogenases adapted to extreme thermal environments. J Mol
Biol 374: 547-562.
Dura et al (2009) The structural and biochemical characterizations of a
novel TET peptidase complex from Pyrococcus horikoshii reveal an
integrated peptide degradation system in hyperthermophilic Archaea. Mol
Microbiol 72: 26-40.
Girard et al. (2011). Structure-function perturbation and dissociation
of tetrameric urate oxidase by high-hydrostatic pressure. Biophys J 98:
2365-2373.
--
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Eric Girard
Extremophiles and Large Macromolecular Assemblies (ELMA) group
Institut de Biologie Structurale J.-P. Ebel
UMR 5075 CEA-CNRS-UJF-PSB
41, Rue Jules Horowitz
38027 Grenoble Cedex 1, France
Web site:http://www.ibs.fr/
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