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Título

Environmental Performance of Pseudomonas putida with a Uracylated Genome

AutorAlgar, Elena; Al-Ramahi, Yamal; Lorenzo, Víctor de CSIC ORCID; Martínez García, Esteban
Palabras claveBiocontainment
GMO escape
Horizontal gene transfer
Pseudomonas putida
Uracil
Fecha de publicación16-nov-2020
EditorWiley-VCH
CitaciónChembiochem : a European journal of chemical biology 21(22): 3255-3265 (2020)
ResumenA variant of the soil bacterium Pseudomonas putida with a genome containing a ∼20 % replacement of the whole of thymine (T) by uracil (U) was made by deleting genes ung (uracil DNA glycosylase) and dut (deoxyuridine 5′‐triphosphate nucleotide hydrolase). Proteomic comparisons revealed that, of 281 up‐regulated and 96 down‐regulated proteins in the Δung Δdut cells, as compared to the wild‐type, many were involved in nucleotide metabolism. Unexpectedly, genome uracylation did not greatly change the gross environmental endurance profile of P. putida, increased spontaneous mutagenesis by only twofold and supported expression of heterologous proteins well. As U‐enriched DNA is potentially degraded by the base excision repair of recipients encoding a uracil DNA glycosylase, we then tested the spread potential of genetic material originating in the Δung Δdut cells either within the same species or in a commonly used Escherichia coli strain. Transformation and conjugation experiments revealed that horizontal gene transfer of U‐containing plasmids fared worse than those made of standard DNA by two orders of magnitude. Although this figure does not guarantee the certainty of containment, it suggests a general strategy for curbing the dispersal of recombinant genetic constructs.
Versión del editorhttp://dx.doi.org/10.1002/cbic.202000330
URIhttp://hdl.handle.net/10261/228953
DOI10.1002/cbic.202000330
ISSN1439-4227
E-ISSN1439-7633
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