54 research outputs found
Evaluation of cell wall preparations for proteomics: a new procedure for purifying cell walls from Arabidopsis hypocotyls
The ultimate goal of proteomic analysis of a cell compartment should be the
exhaustive identification of resident proteins; excluding proteins from other
cell compartments. Plant cell walls possess specific difficulties. Several
reported procedures to isolate cell walls for proteomic analyses led to the
isolation of a high proportion (more than 50%) of predicted intracellular
proteins. The rationales of several published procedures to isolate cell walls
for proteomics were analyzed, with regard to the bioinformatic-predicted
subcellular localization of the identified proteins. A new procedure was
developed to prepare cell walls from etiolated hypocotyls of Arabidopsis
thaliana. After salt extraction, a high proportion of proteins predicted to be
secreted was released (73%), belonging to the same functional classes as
proteins identified using previously described protocols. The new cell wall
preparation described in this paper gives the lowest proportion of proteins
predicted to be intracellular when compared to available protocols. The
application of its principles should lead to a more realistic view of the cell
wall proteome, at least for the weakly bound CWP extractable by salts. In
addition, it offers a clean cell wall preparation for subsequent extraction of
strongly bound CWP
Studying the Boundary Layer Late Afternoon and Sunset Turbulence (BLLAST)
At the end of the afternoon, when the surface heat
fluxes start to sharply decrease, the CBL turns from a
convective well-mixed layer to an intermittently turbulent
residual layer overlying a stably-stratified boundary
layer. This transition raises several observational and
modelling issues. Even the definition of the boundary
layer during this period is fuzzy, since there is no consensus
on what criteria to use and no simple scaling
laws to apply. Yet it plays an important role in such diverse
atmospheric phenomena as transport and diffusion
of trace constituents or wind energy production.
This phase of the diurnal cycle remains largely unexplored,
partly due to the difficulty of measuring weak
and intermittent turbulence, anisotropy, horizontal heterogeneity,
and rapid time changes.
The Boundary Layer Late Afternoon and Sunset Turbulence
(BLLAST) project is gathering about thirty research
scientists from the European Union and the
United States to work on this issue. A field campaign
(BLLAST-FE) is planned for spring or summer 2011 in
Europe. BLLAST will utilize these observations, as well
as previous datasets, large-eddy and direct numerical
simulations, and mesoscale modelling to better understand
the processes, suggest new parameterisations,
and evaluate forecast models during this transitional period.
We will present the issues raised by the late afternoon
transition and our strategy to study it.Peer ReviewedPostprint (published version
Studying the Boundary Layer Late Afternoon nd Sunset Turbulence (BLLAST)
At the end of the afternoon, when the surface heat
fluxes start to sharply decrease, the CBL turns from a
convective well-mixed layer to an intermittently turbulent
residual layer overlying a stably-stratified boundary layer.
This transition raises several observational and modeling
issues. Even the definition of the boundary layer during
this period is fuzzy, since there is no consensus on what
criteria to use and no simple scaling laws to apply. Yet it
plays an important role in such diverse atmospheric phenomena
as transport and diffusion of trace constituents
or wind energy production.
This phase of the diurnal cycle remains largely unexplored,
partly due to the difficulty of measuring weak
and intermittent turbulence, anisotropy, horizontal heterogeneity,
and rapid time changes.
The Boundary Layer Late Afternoon and Sunset
Turbulence (BLLAST) project is gathering about thirty
research scientists from the European Union and the
United States to work on this issue. A field campaign
(BLLAST-FE) is planned for spring or summer 2011 in Europe.
BLLAST will utilize these observations, as well as
previous datasets, large-eddy and direct numerical simulations,
and mesoscale modeling to better understand the
processes, suggest new parameterizations, and evaluate
forecast models during this transitional period.
We will present the issues raised by the late afternoon
transition and our strategy to study it.Peer ReviewedPostprint (published version
Cell wall proteins: a new insight through proteomics
Cell wall proteins are essential constituents of plant cell walls; they are
involved in modifications of cell wall components, wall structure, signaling
and interactions with plasma membrane proteins at the cell surface. The
application of proteomic approaches to the cell wall compartment raises
important questions: are there technical problems specific to cell wall
proteomics? What kinds of proteins can be found in Arabidopsis walls? Are some
of them unexpected? What sort of post-translational modifications have been
characterized in cell wall proteins to date? The purpose of this review is to
discuss the experimental results obtained to date using proteomics, as well as
some of the new questions challenging future research
Etude fonctionnelle d'un récepteur lectine kinase (LecRK79) potentiel partenaire dans les contacts paroi-plasmalemme chez Arabidopsis thaliana
TOULOUSE3-BU Sciences (315552104) / SudocSudocFranceF
Post-translational modifications of plant cell wall proteins and peptides: A survey from a proteomics point of view
International audienc
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