Growth of Cyanobacteria Is Constrained by the Abundance of Light and Carbon Assimilation Proteins.
Cell Rep
; 25(2): 478-486.e8, 2018 10 09.
Article
en En
| MEDLINE
| ID: mdl-30304686
ABSTRACT
Cyanobacteria must balance separate demands for energy generation, carbon assimilation, and biomass synthesis. We used shotgun proteomics to investigate proteome allocation strategies in the model cyanobacterium Synechocystis sp. PCC 6803 as it adapted to light and inorganic carbon (Ci) limitation. When partitioning the proteome into seven functional sectors, we find that sector sizes change linearly with growth rate. The sector encompassing ribosomes is significantly smaller than in E. coli, which may explain the lower maximum growth rate in Synechocystis. Limitation of light dramatically affects multiple proteome sectors, whereas the effect of Ci limitation is weak. Carbon assimilation proteins respond more strongly to changes in light intensity than to Ci. A coarse-grained cell economy model generally explains proteome trends. However, deviations from model predictions suggest that the large proteome sectors for carbon and light assimilation are not optimally utilized under some growth conditions and may constrain the proteome space available to ribosomes.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Proteínas Bacterianas
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Dióxido de Carbono
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Regulación Bacteriana de la Expresión Génica
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Cianobacterias
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Proteoma
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Luz
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Cell Rep
Año:
2018
Tipo del documento:
Article