Analysis of the early heterocyst Cys-proteome in the multicellular cyanobacterium Nostoc punctiforme reveals novel insights into the division of labor within diazotrophic filaments

BMC Genomics

Karin Stensjö²  Margareta Ramström¹  Gustaf Sandh² 

[1]Analytical Chemistry, Department of Chemistry - Biomedical Center, Science for Life Laboratory, Box 599, SE-751 24 Uppsala, Sweden

[2]Microbial Chemistry, Department of Chemistry - Ångström Laboratory, Science for Life Laboratory, Uppsala University, Box 523, SE-751 20 Uppsala, Sweden

关键词: Quantitative proteomics;    Thiols;    ICAT;    Cys Proteome;    Heterocyst;    Cell differentiation;    Nitrogen fixation;    Cyanobacteria;   

Others  :  1089828
DOI  :  10.1186/1471-2164-15-1064

 received in 2014-03-11, accepted in 2014-11-12,  发布年份 2014

【 摘 要 】

Background

In the filamentous cyanobacterium Nostoc punctiforme ATCC 29133, removal of combined nitrogen induces the differentiation of heterocysts, a cell-type specialized in N₂ fixation. The differentiation involves genomic, structural and metabolic adaptations. In cyanobacteria, changes in the availability of carbon and nitrogen have also been linked to redox regulated posttranslational modifications of protein bound thiol groups. We have here employed a thiol targeting strategy to relatively quantify the putative redox proteome in heterocysts as compared to N₂-fixing filaments, 24 hours after combined nitrogen depletion. The aim of the study was to expand the coverage of the cell-type specific proteome and metabolic landscape of heterocysts.

Results

Here we report the first cell-type specific proteome of newly formed heterocysts, compared to N₂-fixing filaments, using the cysteine-specific selective ICAT methodology. The data set defined a good quantitative accuracy of the ICAT reagent in complex protein samples. The relative abundance levels of 511 proteins were determined and 74% showed a cell-type specific differential abundance. The majority of the identified proteins have not previously been quantified at the cell-type specific level. We have in addition analyzed the cell-type specific differential abundance of a large section of proteins quantified in both newly formed and steady-state diazotrophic cultures in N. punctiforme. The results describe a wide distribution of members of the putative redox regulated Cys-proteome in the central metabolism of both vegetative cells and heterocysts of N. punctiforme.

Conclusions

The data set broadens our understanding of heterocysts and describes novel proteins involved in heterocyst physiology, including signaling and regulatory proteins as well as a large number of proteins with unknown function. Significant differences in cell-type specific abundance levels were present in the cell-type specific proteomes of newly formed diazotrophic filaments as compared to steady-state cultures. Therefore we conclude that by using our approach we are able to analyze a synchronized fraction of newly formed heterocysts, which enabled a better detection of proteins involved in the heterocyst specific physiology.

【 授权许可】

   
2014 Sandh et al.; licensee BioMed Central.

【 图 表 】

Figure 1.

Figure 2.

Figure 3.

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