Abstract
Arginine decarboxylase (ADC) is the first enzyme in the alternative route to putrescine in the polyamine biosynthesis pathway in bacteria and plants. In this study, we have focused on the effects of various types of short-term stresses on the transcript amount and specific activity of Synechocystis sp. PCC 6803 ADC. Our results reveal that the steady-state transcript accumulation and enzyme activity are not connected in a simple manner, since only photoheterotrophy and synergistic salt and high-light stress affected both parameters similarly. Changes in the steady-state ADC mRNA accumulation under the other short-term stress conditions studied had only a small impact on enzyme activity, suggesting post-translational regulation. Based on structural modeling, Synechocystis ADCs have a putative extra domain, which might be involved in the post-translational regulation of ADC activity in Synechocystis. In addition, two symmetric inter-subunit disulfide bonds seem to stabilize the dimeric structure of ADCs. There are two genes coding for ADC and agmatinase, another polyamine pathway enzyme, in Synechocystis genome, while the genes coding for ornithine decarboxylase and for some other enzymes in the polyamine pathway were not identified with homology searches.
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Abbreviations
- ADC:
-
Arginine decarboxylase
- AIH:
-
Agmatine iminohydrolase
- DapDC:
-
Diaminopimelate decarboxylase
- DCMU:
-
3-(3′,4′-Dichlorphenyl)-1,1-dimethylurea
- DFMO:
-
DL-α-difluoromethylornithine
- NCPAH:
-
N-carbamoylputrescine amidohydrolase
- ODC:
-
Ornithine decarboxylase
- PDB:
-
Protein data bank
- PLP:
-
Pyridoxal-5′-phosphate
- RT-PCR:
-
Reverse transcription polymerase chain reaction
- SAM:
-
S-adenosylmethionine
- SAMDC:
-
S-adenosylmethionine decarboxylase
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Acknowledgments
The authors thank Professor Mark Johnson for the excellent facilities provided at the Structural Bioinformatics Laboratory of the Department of Biochemistry and Pharmacy, Åbo Akademi University. This work was supported by the Center for International Mobility (CIMO), Finland to S. Jantaro and the National Graduate School of Informational and Structural Biology, Svenska Kulturfonden and the Magnus Ehrnrooth Foundation to H. Kidron and by the Academy of Finland to T. Salminen and P. Mäenpää.
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Saowarath Jantaro, Heidi Kidron, Tiina Salminen and Pirkko Mäenpää have contributed equally to this work
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Jantaro, S., Kidron, H., Chesnel, D. et al. Structural modeling and environmental regulation of arginine decarboxylase in Synechocystis sp. PCC 6803. Arch Microbiol 184, 397–406 (2006). https://doi.org/10.1007/s00203-005-0064-6
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DOI: https://doi.org/10.1007/s00203-005-0064-6