Tag Archive | nitrogen deprivation

Access to N.gaditana B-31 data through the NCBI

After manual review by the NCBI experts, the genomic data of Nannochloropsis gaditana B-31 are now indexed in the NCBI databases and are accessible through the NCBI web interface and through the NCBI search tools (e.g. blast).

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The genomes of the nucleus and of the organelles and the complete annotation of the genomic sequences are registered as bioproject PRJNA170989 ID: 170989, and can be accessed through the following links:

http://www.ncbi.nlm.nih.gov/bioproject/170989 ;

http://www.ncbi.nlm.nih.gov/nuccore/585113370

The sequencing data used to assembly of the genomes were also submitted to the NCBI SRA database and are available for consulting and download. You can find the data of: a fragment library of Nannochloropsis gaditana B-31 whole genomic DNA (i.e. includes DNA from the nucleus and from the organelles) sequenced using 454FLX Titanium XL  sequencing kit, 2 half plates (http://www.ncbi.nlm.nih.gov/sra/SRX390591); a mate pair library of Nannochloropsis gaditana B-31 whole genomic DNA with an insert size of 1.5-3Kb sequenced using the SOLiD 3 Plus sequencing kit, half plate (http://www.ncbi.nlm.nih.gov/sra/SRX390674); a mate pair library of Nannochloropsis gaditana B-31 whole genomic DNA with an insert size of 3-5Kb sequenced using the SOLiD 3 Plus sequencing kit, half plate (http://www.ncbi.nlm.nih.gov/sra/SRX390681). Note that details about the biosamples and about the experiments are linked o the data.
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Proteomics and transcriptomics findings on lipids accumulation in Nannochloropsis

Confocal microscopy image of Nannochloropsis cell grown in nitrogen deprivation. Lipid droplets are in yellow and chloroplast is in red. From "Going ultradeep to unravel the secret recipe of biofuel" Elisa Corteggiani Carpienelli

Confocal microscopy image of Nannochloropsis cell grown in nitrogen deprivation. Lipid droplets are in yellow and chloroplast is in red. From “Going ultra deep to unravel the secret recipe of biofuel” by Elisa Corteggiani Carpinelli

What is the mechanism by which Nannochloropsis cells synthesise and accumulate lipids in certain culturing conditions? And moreover is there a key control that we can manipulate to improve lipid yields and overcome the tradeoff between lipid production and growth? This is probably the “holy grail” of Nannochloropsis research. The general feeling is that we do not have an answer yet, but at least we have some clues to start our quest.

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Proteomics and transcriptomics findings on Nitrogen stress respons in Nannochloropsis

Nannochloropsis cultivated in normal growth condition and deprived of a nitrogen source continues growing for at least 4–5 days.

Analyses of the gene expression and of the protein abundance in nitrogen scarcity, reveal that Nannochloropsis activates mechanisms for nitrogen assimilation and redistribution to allow survival through a partial reorganisation of the cellular metabolism.

Model of Nannochloropsis response to nitrogen deprivation

This figure reports the model of the response to nitrogen deprivation elaborated by Corteggiani Carpinelli et al. (2013).

DEGRADATIVE PROCESSES

Various genes involved in controlled degradation of proteins are over-expressed in the cells grown in nitrogen deprivation, including: cullin (Naga_100070g1), which is responsible for protein ubiquitination; ubiquitin-specific protease (Naga_100587g2); proteases (Naga_100611g3, Naga_100098g23, Naga_100015g80.1); endopeptidase Naga_101780g1); aminopeptidase (Naga_100024g51) and two autophagy-related proteins (Naga_101823g1 and Naga_100732g4), which are likely involved in the formation of cytosolic sequestering vesicles used for degradation and recycling of cellular components.

The proteomic study shows that the relative abundance of one subunit of the protein degrading complex (Proteasome subunit alpha) increases in nitrogen starvation supporting the evidence that processes of protein degradation are activated in response to nitrogen starvation. The analysis of protein abundance also suggests that in nitrogen starvation autophagy is induced. Indeed the abundance of a receptor-mediated endocytosis protein slightly increases and also that of two vacuolar proton pump subunits. These data, together with morfological observations, support the hypothesis that upon nitrogen deprivation the organelles are degraded in the vacuoles through a process of controlled autophagy.

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