Dataset Information


Comprehensive Proteomic Analysis of Nitrogen Starved Mycobacterium smegmatis Δpup Reveals the Impact of Pupylation on Nitrogen Stress Response

ABSTRACT: Mycobacterium smegmatis is a soil bacterium exposed to continuously environmental changes of nitrogen availability. As member of Actinobacteria, it possesses an ubiquitin-like post-translational modification pathway called pupylation. The pathway starts when a small protein called Pup is attached to a lysine of a specific cellular target. Then the Pup-modified protein is degraded by the proteasome, as it was shown that Pup acts as degradation signal. Recent studies showed the role of pupylation in Mycobacterium smegmatis for survival under nitrogen starvation by supplying recycled amino acids. The present study is an investigation of the influence of Mycobacterium smegmatis Pup protein on the whole proteome in absence of nitrogen sources. Therefore a pup deletion mutant was generated. Applying stable isotope dimethyl labelling, low impact of the pupylation on proteome was revealed immediately after exposure to growth medium lacking nitrogen. In contrast, post 24 h of nitrogen starvation, Msm pup deletion strain showed several proteins with significant changes in abundance. Noteworthy, key proteins involved in nitrogen assimilation were significantly affected in Msm Δpup. Furthermore, we label-free quantified pupylated proteins of nitrogen starved Msm for a more extensive understanding of pupylation role in surviving and overcoming the lack of nitrogen.

INSTRUMENT(S): LTQ Orbitrap XL, Orbitrap Fusion

ORGANISM(S): Mycolicibacterium smegmatis MC2 155  

TISSUE(S): Tissue Not Applicable To Dataset

DISEASE(S): Not Available

SUBMITTER: Giuseppina Fascellaro  

LAB HEAD: Frank Imkamp

PROVIDER: PXD003229 | Pride | 2016-08-11


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Comprehensive Proteomic Analysis of Nitrogen-Starved Mycobacterium smegmatis Δpup Reveals the Impact of Pupylation on Nitrogen Stress Response.

Fascellaro Giuseppina G   Petrera Agnese A   Lai Zon Weng ZW   Nanni Paolo P   Grossmann Jonas J   Burger Sibylle S   Biniossek Martin L ML   Gomez-Auli Alejandro A   Schilling Oliver O   Imkamp Frank F  

Journal of proteome research 20160725 8

Pupylation is a bacterial ubiquitin-like protein modification pathway, which results in the attachment of the small protein Pup to specific lysine residues of cellular targets. Pup was shown to serve as a degradation signal, directing proteins toward the bacterial proteasome for turnover. Recently, it was hypothesized that pupylation and proteasomal protein degradation support the survival of Mycobacterium smegmatis (Msm) during nitrogen starvation by supplying recycled amino acids. In the prese  ...[more]

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