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Adaptive Evolution of Escherichia coli Inactivated in the Phosphotransferase System Operon Improves Co-utilization of Xylose and Glucose Under Anaerobic Conditions

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Abstract

Modification of the phosphoenolpyruvate/sugar phosphotransferase system (PTS) has shown improvement in sugar coassimilation in Escherichia coli production strains. However, in preliminary experiments under anaerobic conditions, E. coli strains with an inactive PTS and carrying pLOI1594, which encodes pyruvate decarboxylase and alcohol dehydrogenase from Zymomonas mobilis, were unable to grow. These PTS− strains were previously evolved under aerobic conditions to grow rapidly in glucose (PTS- Glucose+ phenotype). Thus, in this work, applying a continuous culture strategy under anaerobic conditions, we generate a new set of evolved PTS− Glucose+ mutants, VH30N1 to VH30N6. Contrary to aerobically evolved mutants, strains VH30N2 and VH30N4 carrying pLOI1594 grew in anaerobiosis; also, their growth capacity was restored in a 100%, showing specific growth rates (μ ~ 0.12 h−1) similar to the PTS+ parental strain (μ = 0.11 h−1). In cultures of VH30N2/pLOI1594 and VH30N4/pLOI1594 using a glucose–xylose mixture, xylose was totally consumed and consumption of sugars occurred in a simultaneous manner indicating that catabolic repression is alleviated in these strains. Also, the efficient sugar coassimilation by the evolved strains caused an increment in the ethanol yields.

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Acknowledgements

We thank Mercedes Enzaldo, Georgina Hernández, and Roberto Rodríguez for technical assistance. This work was supported by the following grants: Estado de Morelos MOR-2007-C01-80360 and PAPIIT-DGAPA-UNAM IN226908-3 and IN220908. V. Hernández-Montalvo held a scholarship from CONACyT-México. V.E. Balderas-Hernández is thankful for the postdoctoral fellowship support by DGAPA-UNAM.

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Authors and Affiliations

  1. Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Apdo. Postal 510-3, Cuernavaca, Morelos, 62250, México

    Victor Emmanuel Balderas-Hernández, Verónica Hernández-Montalvo, Francisco Bolívar, Guillermo Gosset & Alfredo Martínez

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  1. Victor Emmanuel Balderas-Hernández
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  2. Verónica Hernández-Montalvo
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  3. Francisco Bolívar
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  4. Guillermo Gosset
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  5. Alfredo Martínez
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Corresponding author

Correspondence to Alfredo Martínez.

Additional information

Victor E. Balderas-Hernández and Verónica Hernández-Montalvo contributed equally to this work.

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Balderas-Hernández, V.E., Hernández-Montalvo, V., Bolívar, F. et al. Adaptive Evolution of Escherichia coli Inactivated in the Phosphotransferase System Operon Improves Co-utilization of Xylose and Glucose Under Anaerobic Conditions. Appl Biochem Biotechnol 163, 485–496 (2011). https://doi.org/10.1007/s12010-010-9056-3

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  • DOI: https://doi.org/10.1007/s12010-010-9056-3

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