Abstract
| Original language | English |
|---|---|
| Article number | fny008 |
| Number of pages | 7 |
| Journal | FEMS Microbiology Letters |
| Volume | 365 |
| Issue number | 4 |
| Early online date | 16 Jan 2018 |
| DOIs | |
| Publication status | Published - 1 Feb 2018 |
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Uncovering behavioural diversity amongst high-strength Pseudomonas spp. surfactants at the limit of liquid surface tension reduction. / Kabir, Kamaluddeen; Deeni, Yusuf Y.; Hapca, Simona M.; Moore, Luke; Spiers, Andrew J.
In: FEMS Microbiology Letters, Vol. 365, No. 4, fny008, 01.02.2018.Research output: Contribution to journal › Article
TY - JOUR
T1 - Uncovering behavioural diversity amongst high-strength Pseudomonas spp. surfactants at the limit of liquid surface tension reduction
AU - Kabir, Kamaluddeen
AU - Deeni, Yusuf Y.
AU - Hapca, Simona M.
AU - Moore, Luke
AU - Spiers, Andrew J.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - Bacterial bio-surfactants have a wide range of biological functions and biotechnological applications. Previous analyses had suggested a limit to their reduction of aqueous liquid surface tensions (gMin), and here we confirm this in an analysis of 25 Pseudomonas spp. strains isolated from soil which produce high-strength surfactants that reduce surface tensions to 25.2 ± 0.1 – 26.5 ± 0.2 mN.m-1 (the surface tension of sterile growth medium and pure water was 52.9 ± 0.4 mN.m-1 and 72.1 ± 1.2 mN.m-1, respectively). Comparisons of culture supernatants produced using different growth media and semi-purified samples indicate that the limit of 24.2 – 24.7 mN.m-1 is not greatly influenced by culture conditions, pH or NaCl concentrations. We have used foam, emulsion and oil-displacement behavioural assays as a simple and cost-effective proxy for in-depth biochemical characterisation, and these suggest there is significant structural diversity amongst these surfactants which may reflect different biological functions and offer new biotechnological opportunities. Finally, we obtained a draft genome for the strain producing the highest-strength surfactant, and identified a cluster of non-ribosomal protein synthase genes which may produce a cyclic-lipopeptide (CLP)–like surfactant. Further investigation of this group of related bacteria recovered from the same site will allow a better understanding of the significance of the great variety of surfactants produced by bacterial communities found in soil and elsewhere.
AB - Bacterial bio-surfactants have a wide range of biological functions and biotechnological applications. Previous analyses had suggested a limit to their reduction of aqueous liquid surface tensions (gMin), and here we confirm this in an analysis of 25 Pseudomonas spp. strains isolated from soil which produce high-strength surfactants that reduce surface tensions to 25.2 ± 0.1 – 26.5 ± 0.2 mN.m-1 (the surface tension of sterile growth medium and pure water was 52.9 ± 0.4 mN.m-1 and 72.1 ± 1.2 mN.m-1, respectively). Comparisons of culture supernatants produced using different growth media and semi-purified samples indicate that the limit of 24.2 – 24.7 mN.m-1 is not greatly influenced by culture conditions, pH or NaCl concentrations. We have used foam, emulsion and oil-displacement behavioural assays as a simple and cost-effective proxy for in-depth biochemical characterisation, and these suggest there is significant structural diversity amongst these surfactants which may reflect different biological functions and offer new biotechnological opportunities. Finally, we obtained a draft genome for the strain producing the highest-strength surfactant, and identified a cluster of non-ribosomal protein synthase genes which may produce a cyclic-lipopeptide (CLP)–like surfactant. Further investigation of this group of related bacteria recovered from the same site will allow a better understanding of the significance of the great variety of surfactants produced by bacterial communities found in soil and elsewhere.
U2 - 10.1093/femsle/fny008
DO - 10.1093/femsle/fny008
M3 - Article
VL - 365
JO - FEMS Microbiology Letters
JF - FEMS Microbiology Letters
SN - 1574-6968
IS - 4
M1 - fny008
ER -