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Volume 153, Issue 2

Proteomic analyses of the photoauto- and diazotrophically grown cyanobacterium sp. PCC 73102 Free

Abstract

The filamentous cyanobacteria of the genus are globally distributed, phenotypically complex organisms, capable of cellular differentiation and of forming symbiotic associations with a wide range of plants. To further our understanding of these processes and functions, the proteome of photoautotrophically and diazotrophically grown sp. PCC 73102 () cells was examined. Extracted proteins were separated into membrane and soluble protein fractions and analysed using two-dimensional gel electrophoresis and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF MS). The analysis led to the identification of 82 proteins that could be divided into 12 functional categories. Significantly, 65 of these proteins have not been previously documented in the proteome. Many of the proteins identified were readily recognized as housekeeping proteins involved in carbon, nitrogen and energy metabolism, but a number of proteins related to stress, motility, secretion and post-translational modifications were also identified. Ten unclassified proteins were also detected, representing potential novel functions. These proteins were highly expressed, suggesting that they play key roles during photoautotrophic and diazotrophic growth. Nineteen of the proteins expressed under the growth conditions examined contained putative thioredoxin (Trx) targets, a motif that functions in redox regulation via redox equivalent mediators and is known to be significant in a wide range of biological processes. These observations contribute to our understanding of the complex life cycle.

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  • Accepted:
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  • Published Online:
Keyword(s): 6PGD, 6-phosphogluconate dehydrogenase , AvAK, akinete marker protein , G6PD, glucose-6-phosphate dehydrogenase , OEP, outer-membrane efflux protein , OPP, oxidative pentose phosphate , PBS, phycobilisome , PRK, phosphoribulokinase , Trx, thioredoxin and vWA, von Willebrand factor type A
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2007-02-01
2024-04-19
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Proteomic analyses of the photoauto- and diazotrophically grown cyanobacterium Nostoc sp. PCC 73102
Microbiology 153, 608 (2007); https://doi.org/10.1099/mic.0.29198-0
/content/journal/micro/10.1099/mic.0.29198-0
/content/journal/micro/10.1099/mic.0.29198-0
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