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논문 기본 정보

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학술저널
저자정보
Xu Jin (Department of Anesthesiology, People’s Hospital of Chongqing Liang Jiang New Area, Chongqing 401121, P.R. China) Jin Dandan (Department of Anesthesiology, People’s Hospital of Chongqing Liang Jiang New Area, Chongqing 401121, P.R. China) Wang Zhengwei (Department of Anesthesiology, People’s Hospital of Chongqing Liang Jiang New Area, Chongqing 401121, P.R. China)
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology Vol.34 No.6
발행연도
2024.6
수록면
1,322 - 1,327 (6page)
DOI
10.4014/jmb.2404.04012

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The accurate and rapid detection of methicillin-resistant Staphylococcus aureus (MRSA) holds significant clinical importance. This work presents a new method for detecting methicillin-resistant Staphylococcus aureus (S. aureus) in clinical samples. The method uses an aptamer-based colorimetric assay that combines a recognizing probe to identify the target and split DNAzyme to amplify the signal, resulting in a highly sensitive and direct analysis of methicillin-resistance. The identification of the PBP2a protein on the membrane of S. aureus in clinical samples leads to the allosterism of the recognizing probe, and thus provides a template for the proximity ligation of split DNAzyme. The proximity ligation of split DNAzyme forms an intact DNAzyme to identify the loop section in the L probe and generates a nicking site to release the loop sequence (“3” and “4” fragments). The “3” and “4” fragments forms an intact sequence to induce the catalytic hairpin assembly, exposing the G-rich section. The released the G-rich sequence of LR probe induces the formation of G-quadruplex–hemin DNAzyme as a colorimetric signal readout. The absorption intensity demonstrated a strong linear association with the logarithm of the S. aureus concentration across a wide range of 5 orders of magnitude dynamic range under the optimized experimental parameters. The limit of detection was calculated to be 23 CFU/ml and the method showed high selectivity for MRSA.

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