The cyanobacterial ribosomal-associated protein LrtA is involved in post-stress survival in Synechocystis sp. PCC 6803

A light-repressed transcript encodes the LrtA protein in cyanobacteria. We show that half-life of lrtA transcript from Synechocystis sp. PCC 6803 is higher in dark-treated cells as compared to light-grown cells, suggesting post-transcriptional control of lrtA expression. The lrtA 5´ untranslated lea...

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Hauptverfasser: Galmozzi, Carla (VerfasserIn) , Florencio, Francisco J. (VerfasserIn) , Muro-Pastor, M. Isabel (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: July 21, 2016
In: PLOS ONE
Year: 2016, Jahrgang: 11, Heft: 7, Pages: e0159346
ISSN:1932-6203
Online-Zugang: Volltext
Verfasserangaben:Carla V. Galmozzi, Francisco J. Florencio, M. Isabel Muro-Pastor

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520 |a A light-repressed transcript encodes the LrtA protein in cyanobacteria. We show that half-life of lrtA transcript from Synechocystis sp. PCC 6803 is higher in dark-treated cells as compared to light-grown cells, suggesting post-transcriptional control of lrtA expression. The lrtA 5´ untranslated leader region is involved in that darkness-dependent regulation. We also found that Synechocystis sp. PCC 6803 LrtA is a ribosome-associated protein present in both 30S and 70S ribosomal particles. In order to investigate the function of this protein we have constructed a deletion mutant of the lrtA gene. Cells lacking LrtA (∆lrtA) had significantly lower amount of 70S particles and a greater amount of 30S and 50S particles, suggesting a role of LrtA in stabilizing 70S particles. Synechocystis strains with different amounts of LrtA protein: wild-type, ∆lrtA, and LrtAS (overexpressing lrtA) showed no differences in their growth rate under standard laboratory conditions. However, a clear LrtA dose-dependent effect was observed in the presence of the antibiotic tylosin, being the LrtAS strains the most sensitive. Similar results were obtained under hyperosmotic stress caused by sorbitol. Conversely, after prolonged periods of starvation, ∆lrtA strains were delayed in their growth with respect to the wild-type and the LrtAS strains. A positive role of LrtA protein in post-stress survival is proposed. 
650 4 |a 5' Untranslated Regions 
650 4 |a Amino Acid Sequence 
650 4 |a Bacterial Proteins 
650 4 |a Chloroplasts 
650 4 |a Gene Expression Regulation, Bacterial 
650 4 |a Light 
650 4 |a Microbial Viability 
650 4 |a Ribosomal Proteins 
650 4 |a Ribosomes 
650 4 |a RNA, Messenger 
650 4 |a Sequence Alignment 
650 4 |a Sodium Chloride 
650 4 |a Sorbitol 
650 4 |a Stress, Physiological 
650 4 |a Synechocystis 
650 4 |a Tylosin 
700 1 |a Florencio, Francisco J.  |e VerfasserIn  |4 aut 
700 1 |a Muro-Pastor, M. Isabel  |e VerfasserIn  |4 aut 
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