In vitro HER2 protein-induced affinity dissociation of carbon nanotube-wrapped anti-HER2 aptamers for HER2 protein detection

Kolkar Mohammed, Javed Hussain Niazi and Verma, Sandeep Kumar and Niazi, Sarfaraz and Qureshi, Anjum (2014) In vitro HER2 protein-induced affinity dissociation of carbon nanotube-wrapped anti-HER2 aptamers for HER2 protein detection. (Accepted/In Press)

Warning
There is a more recent version of this item available.
[thumbnail of Accepted paper published online] PDF (Accepted paper published online)
Analyst_2014.pdf
Restricted to Registered users only

Download (612kB) | Request a copy

Abstract

A new in vitro assay was developed to detect human epidermal growth factor receptor 2 (HER2) protein, based on affinity dissociation of carbon nanotube (CNT)-wrapped anti-HER2 ssDNA aptamers. First, we selected an anti-HER2 ssDNA aptamer (H2) using an in vitro serial evolution of ligands by an exponential enrichment (SELEX) process. Then the fluorescently labelled H2 ssDNAs were tightly packed on CNTs that had previously been coupled with magnetic microbeads (MBs), forming MB–CNT–H2 hybrids. The loading capacity of these MB–CNTs heterostructures (2.8 × 108) was determined to be 0.025 to 3.125 μM of H2. HER2 protein-induced H2 dissociation occurred from MB–CNT–H2 hybrids, which was specifically induced by the target HER2 protein, with a dissociation constant (Kd) of 270 nM. The stoichiometric affinity dissociation ratio with respect to H2-to-HER2 protein was shown to be approximately 1 : 1. Our results demonstrated that the developed assay can be an effective approach in detecting native forms of disease biomarkers in free solutions or in biological samples, for accurate diagnosis.
Item Type: Article
Subjects: R Medicine > RZ Other systems of medicine
Q Science > QD Chemistry
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Sabancı University Nanotechnology Research and Application Center
Faculty of Engineering and Natural Sciences > Basic Sciences > Physics
Faculty of Engineering and Natural Sciences > Academic programs > Electronics
Faculty of Engineering and Natural Sciences
Depositing User: Javed Kolkar
Date Deposited: 10 Dec 2014 20:39
Last Modified: 26 Apr 2022 09:16
URI: https://research.sabanciuniv.edu/id/eprint/25233

Available Versions of this Item

Actions (login required)

View Item
View Item