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Characterization of the specific interaction between the DNA aptamer sgc8c and protein tyrosine kinase-7 receptors at the surface of T-cells by biosensing AFM
AutorInnenEbner, Andreas ; Poturnayova, Alexandra ; Lamprecht, Constanze ; Weich, Sabine ; Snejdarkova, Maja ; Karpisova, Tibor Hianik ; Leitner, Michael
Erschienen in
Analytical and Bioanalytical Chemistry, 2017, Jg. 409, H. 11, S. 2767-2776
ErschienenSpringer Berlin Heidelberg, 2017
SpracheEnglisch
DokumenttypAufsatz in einer Zeitschrift
Schlagwörter (EN)DNA aptamer / PTK7 / T-cell / Single molecule force spectroscopy / Energy landscape / Molecular recognition / Recognition imaging
ISSN1618-2650
URNurn:nbn:at:at-ubl:3-1974 Persistent Identifier (URN)
DOIdoi.org/10.1007/s00216-017-0238-5 
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Characterization of the specific interaction between the DNA aptamer sgc8c and protein tyrosine kinase-7 receptors at the surface of T-cells by biosensing AFM [2.81 mb]
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Zusammenfassung (Englisch)

We studied the interaction of the specific DNA aptamer sgc8c immobilized at the AFM tip with its corresponding receptor, the protein tyrosine kinase-7 (PTK7) embedded in the membrane of acute lymphoblastic leukemia (ALL) cells (Jurkat T-cells). Performing single molecule force spectroscopy (SMFS) experiments, we showed that the aptamer sgc8c bound with high probability (38.37.48%) and high specificity to PTK7, as demonstrated by receptor blocking experiments and through comparison with the binding behavior of a nonspecific aptamer. The determined kinetic off-rate (koff=5.16 s1) indicates low dissociation of the sgc8cPTK7 complex. In addition to the pulling force experiments, simultaneous topography and recognition imaging (TREC) experiments using AFM tips functionalized with sgc8c aptamers were realized on the outer regions surface of surface-immobilized Jurkat cells for the first time. This allowed determination of the distribution of PTK7 without any labeling and at near physiological conditions. As a result, we could show a homogeneous distribution of PTK7 molecules on the outer regions of ALL cells with a surface density of 32512 PTK7 receptors (or small receptor clusters) per m2.

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