ArticleScientific reports2024
Size-dependent ability of AtaA to immobilize cells in Acinetobacter sp. Tol 5.
Article in Scientific reports, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Microbial cells serve as efficient and environmentally friendly biocatalysts, but their stability and reusability in practical applications must often be improved through immobilization. Acinetobacter sp. Tol 5 shows high adhesiveness to materials due to its large cell surface protein AtaA, which consists of 3630 amino acids (aa). Previously, we developed a method for immobilizing bacteria using AtaA. Herein, we investigated the cell immobilization ability of in-frame deletion (IFD) mutants of AtaA with different sizes in Tol 5. Mini-AtaA, which consists of 775 aa and is functional in Escherichia coli, was produced and present on the cell surface; however, mini-AtaA showed no immobilization ability in Tol 5. A cell immobilization assay was performed with cells expressing 16 IFD mutants of AtaA with different sizes, revealing that a length of at least 1417 aa was required for the sufficient immobilization of Tol 5 cells; thus, the minimum length needed to achieve the adhesive function of AtaA varies among bacterial species. The constructed mutant library of AtaA ranging from 3630 to 775 aa will allow researchers to quickly and easily explore the optimal size of AtaA, even for bacteria newly introduced to AtaA.
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