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Microbial transformation of 1,6-dichloro-1,6-dideoxy-β,D-fructofuranosyl-4-chloro-4-deoxy-α,D-galactopyranoside (TGS) by soil populations

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Summary

Soil microorganisms from one site were shown to be consistently capable of the transformation of 1,6-dichloro-1,6-dideoxy-β,d-fructofuranosyl-4-chloro-4-deoxy-α,d-galactopyranoside (TGS) in laboratory batch cultures. With fresh soils, all of the available chloride ions were released from the molecule. Subcultures of a TGS-dehalogenating bacterial community produced a progressive decline in the dehalogenating capabilities towards the substrate. The soil organisms did not utilise TGS as a carbon source. The transformation was achieved by co-metabolism and was probably supported by an unknown component in the soil. Four bacterial species were isolated from the TGS-dehalogenating soil community: twoBacillus species, anAcinetobacter group isolate and aMicrococcus group isolate. Thin-layer chromatography confirmed the disappearance of the chlorosugar and high-performance liquid chromatography demonstrated that neither of the constituent monosaccharides—1,6-dichlorofructose nor 4-chlorogalactosucrose was accumulated as an intermediate.

Résumé

Les microorganismes du sol d'un certain endroit ont été démontrés être capable, sans exception, de la transformation de 1,6-dichloro-1,6-dideoxy-β,D-fructofuranosyl-4-chloro-4-deoxy-α,D-galactopyranoside (TGS) en cultures de laboratoire du type discontinu. Avec des prélèvements frais du sol, tous les ions disponibles de chlorure ont été libérés de la molécule. Des souscultures d'une communauté bactérienne capable de déhalogeniser le TGS ont produit un déclin progressif de la capacité de déhalogeniser le substrat. Les microorganismes du sol n'ont pas utilisé le TGS comme source de carbone. La transformation s'est accomplie par cometabolisme et, probablement, s'est basée sur un component indéterminé du sol. Quatre espèces bactériennes ont été isolées de la communauté de bactéries du sol capable de déhalogeniser le TGS: deux espèces deBacillus, unAcinetobacter et unMicrococcus. Des études de chromatographie de couches fines ont confirmées la disparition du chlorosaccharide, tandis que des études de chromatographie liquide de haut rendement ont démontrées que, des monosaccharides constituants, ni 1,6-dichlorofructose ni 4-chlorogalactosucrose, n'ont été accumulés comme produits intermédiaires.

Resumen

Microorganismos de suelo de cierto lugar demostraron consistemente ser capaces de realizar la transformación de 1,6-dicloro-1,6 dideoxi-β-D-fructofuranosil-4-cloro-4-deoxi-α,D-alactopiranosa (TGS) in culturas de laboratorio de tipo discontinuo. Con muestras frescas de suelo, todos los iones cloruro fueron liberados de la molecula. Subculturas de una comunidad bacterial capaz de dehalogenizar TGS produjeron una declinación progresiva de la capacidad de dehalogenizar el substrato. Los microorganismos no utilizaron el TGS como fuente de carbono. La transformación se realiza por co-metabolismo y probablemente se base en un componente del suelo, no determinado. Cuatro especies bacteriales fueron aisladas de la comunidad de bacterias de suelo con capacidad de dehalogenar el TGS: dos especies deBacilo, unaAcinelobacteria y unMicrococo. Estudios de cromatografía de capa delgada confirmaron la desaparición del clorosacárido, y estadios de cromatografía liquida demostraron que ninguno de los componentes monoscáridos — 1,6-diclorofructuosa y 4-clorogalactosucrosa — eran acumulados como productors intermedios.

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Lappin-Scott, H.M., Holt, G. & Bull, A.T. Microbial transformation of 1,6-dichloro-1,6-dideoxy-β,D-fructofuranosyl-4-chloro-4-deoxy-α,D-galactopyranoside (TGS) by soil populations. Mircen Journal 3, 95–102 (1987). https://doi.org/10.1007/BF00933609

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  • DOI: https://doi.org/10.1007/BF00933609

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