The bacterionanofiber protein AtaA, a member of the trimeric autotransporter adhesin family found in Acinetobacter sp. Tol 5, is responsible for the nonspecific, high adhesiveness and autoagglutination of this strain. Previously, we introduced the ataA gene into the nonadhesive Acinetobacter strain ST-550, which conferred high adhesiveness to this strain, immobilized its cells, and improved indigo productivity due to enhanced tolerance to the toxic substrate. In this study, we again demonstrated the effectiveness of this new microbial immobilization method using AtaA in a number of conditions. AtaA enabled the effective immobilization of growing, resting, and lyophilized cells of a type strain of Acinetobacter, ADP1, which is also intrinsically nonadhesive, onto the surface of several kinds of support ranging from artificial to natural materials and from hydrophobic polyurethane to hydrophilic glass. Immobilization with AtaA enabled exclusive cell growth in the support space and only a few cells existed in the bulk medium. Immobilization of resting cells drastically increased cell concentration, depending on the support material; dry cells of approximately 110 g/L could be immobilized onto glass wool. Finally, we demonstrated that ADP1 cells immobilized on polyurethane foam can undergo at least 10 repetitive reactions without inactivation during a 5-h period. Even after drying and storing for 3 days, the immobilized cells showed enzymatic activity and an ester hydrolysis reaction was repeated by simply transferring the support with the cells into a fresh reaction buffer.
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This work was supported by grants from the Japan Science and Technology Agency through the “Precursory Research for Embryonic Science and Technology Program” and by the Japan Society for the Promotion of Science through the “Funding Program for Next Generation World-Leading Researchers (NEXT Program),” initiated by the Council for Science and Technology Policy in Japan.
Conflict of interest
A patent application has been filed in relation to this work (WO2009/104281).
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Hori, K., Ohara, Y., Ishikawa, M. et al. Effectiveness of direct immobilization of bacterial cells onto material surfaces using the bacterionanofiber protein AtaA. Appl Microbiol Biotechnol 99, 5025–5032 (2015). https://doi.org/10.1007/s00253-015-6554-9
- Trimeric autotransporter adhesin