Label-free, electrical detection of the SARS virus N-protein with nanowire biosensors utilizing antibody mimics as capture probes.
Antibody mimic proteins (AMPs) are polypeptides that bind to their target analytes with high affinity and specificity, just like conventional antibodies, but are much smaller in size (2-5 nm, less than 10 kDa). In this report, we describe the first application of AMP in the field of nanobiosensors. In(2)O(3) nanowire based biosensors have been configured with an AMP (Fibronectin, Fn) to detect nucleocapsid (N) protein, a biomarker for severe acute respiratory syndrome (SARS). Using these devices, N protein was detected at subnanomolar concentration in the presence of 44 microM bovine serum albumin as a background. Furthermore, the binding constant of the AMP to Fn was determined from the concentration dependence of the response of our biosensors.
Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, USA.
Fumiaki N
FN
Ishikawa
Hsiao-Kang
HK
Chang
Marco
M
Curreli
Hsiang-I
HI
Liao
C Anders
CA
Olson
Po-Chiang
PC
Chen
Rui
R
Zhang
Richard W
RW
Roberts
Ren
R
Sun
Richard J
RJ
Cote
Mark E
ME
Thompson
Chongwu
C
Zhou
D000914:Antibodies, Viral / Q000737:chemistry*; D040761:Biomimetic Materials / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation*; D004563:Electrochemistry / Q000295:instrumentation*; D004867:Equipment Design; D005353:Fibronectins / Q000276:immunology; D007204:Indium / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation; D010316:Particle Size; D045473:Severe acute respiratory syndrome-related coronavirus / Q000276:immunology / Q000302:isolation & purification*; D013194:Staining and Labeling; D013499:Surface Properties
D000914:Antibodies, Viral; D005353:Fibronectins; D046911:Macromolecular Substances; D007204:Indium; C047711:indium oxide