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Selection, Characterization and Interaction Studies of a DNA Aptamer for the Detection of Bifidobacterium bifidum.

Abstract：

:A whole-bacterium-based SELEX (Systematic Evolution of Ligands by Exponential Enrichment) procedure was adopted in this study for the selection of an ssDNA aptamer that binds to Bifidobacterium bifidum. After 12 rounds of selection targeted against B. bifidum, 30 sequences were obtained and divided into seven families according to primary sequence homology and similarity of secondary structure. Four FAM (fluorescein amidite) labeled aptamer sequences from different families were selected for further characterization by flow cytometric analysis. The results reveal that the aptamer sequence CCFM641-5 demonstrated high-affinity and specificity for B. bifidum compared with the other sequences tested, and the estimated Kd value was 10.69 ± 0.89 nM. Additionally, sequence truncation experiments of the aptamer CCFM641-5 led to the conclusion that the 5'-primer and 3'-primer binding sites were essential for aptamer-target binding. In addition, the possible component of the target B. bifidum, bound by the aptamer CCFM641-5, was identified as a membrane protein by treatment with proteinase. Furthermore, to prove the potential application of the aptamer CCFM641-5, a colorimetric bioassay of the sandwich-type structure was used to detect B. bifidum. The assay had a linear range of 10⁴ to 10⁷ cfu/mL (R² = 0.9834). Therefore, the colorimetric bioassay appears to be a promising method for the detection of B. bifidum based on the aptamer CCFM641-5.

journal_name

Int J Mol Sci

journal_title

International journal of molecular sciences

authors

Hu L,Wang L,Lu W,Zhao J,Zhang H,Chen W

doi

10.3390/ijms18050883

subject

Has Abstract

pub_date

2017-04-25 00:00:00

issue

5

issn

1422-0067

pii

ijms18050883

journal_volume

18

pub_type

杂志文章

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