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A Protein Patterning Technique And Its Application In Bio-Inspired Self-Assembly

Published online by Cambridge University Press:  11 February 2011

D. Guo ,
H. McNally ,
M. Pingle ,
D. Bergstrom  and
R. Bashir
D. Guo
Affiliation:
School of Electrical and Computer, Engineering, W. Lafayette, IN 47907
H. McNally
Affiliation:
School of Electrical and Computer, Engineering, W. Lafayette, IN 47907
M. Pingle
Affiliation:
Department of Medicinal Chemistry, W. Lafayette, IN 47907
D. Bergstrom
Affiliation:
Department of Medicinal Chemistry, W. Lafayette, IN 47907
R. Bashir
Affiliation:
School of Electrical and Computer, Engineering, W. Lafayette, IN 47907 Department of Biomedical Engineering Purdue University, W. Lafayette, IN 47907
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Abstract

Protein patterning techniques are crucial for the development of antibody-based biosensor and the study of controlled cell growth. This paper discusses a protein patterning technique based on microelectronic fabrication, DNA hybridization and biotin-streptavidin pair. A gold-on-silicon-dioxide substrate with micron size pattern was fabricated with photolithography and lift-off process. The average surface roughness of the gold pattern is 4.3 nm, measured by contact mode AFM. Thiol derivatized single stranded DNA was attached to the gold pattern surface by the chemical bonding between gold atom and sulfur atom. Surface attached DNA was then hybridized with a biotin conjugated complementary DNA sequence. Thus, the gold pattern was translated into a biotin pattern with similar resolution. Fluorescein conjugated streptavidin was patterned as demonstration. Fluorescence microscopy shows relative uniform streptavidin coverage of micron resolution and low background non-specific binding. The proposed protein patterning technique takes advantage of the high resolution of modern microelectronic fabrication. It has the potential of reaching sub-micron resolution. The biotin-streptavidin pair provides extremely specific and stable linking for protein immobilization. To show its application in biological inspired self-assembly, this technique was used successfully in the self-assembly of 20 nm streptavidin conjugated gold particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 735: Symposium C – Bioinspired Nanoscale Hybrid Systems , 2002 , C2.4
Copyright
Copyright © Materials Research Society 2003

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References

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