Controlled alignment of multiple proteins and nanoparticles with nanometer resolution via backbone-modified phosphorothioate DNA and bifunctional linkers.
Controlled alignment of streptavidin (STV), myoglobin, and nanoparticles with nanometer resolution has been achieved via backbone-modified phosphorothioate DNA and biotin- and maleimide-containing bifunctional linkers. Introducing triplet biotin modifications in three adjacent PSs significantly increased the STV conjugation yield. By placing phosphorothioate modifications at multiple positions of a double stranded DNA template, monomer, dimer, and trimer STV-DNA assemblies were formed with the STVs placed at controlled positions. The activity of the conjugated protein has been demonstrated by binding biotinylated AuNPs onto STV-DNA complexes, indicating the use of the system as a template for the formation of AuNP dimers and trimers with STVs separated by distances of 10-30 nm. Furthermore, a melting temperature experiment carried out with an STV-dsDNA assembly showed that the bifunctional-linker-modified PS-DNA system is much more stable than base-modified conjugation systems. This method allows for high yield, nanoscale-precision conjugation of multiple proteins to DNA. The linker can be designed to conjugate any proteins and nanomaterials specifically for a wide range of applications.
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
Jung Heon
JH
Lee
Ngo Yin
NY
Wong
Li Huey
LH
Tan
Zidong
Z
Wang
Yi
Y
Lu
D000818:Animals; D003432:Cross-Linking Reagents / Q000737:chemistry*; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D053768:Metal Nanoparticles / Q000737:chemistry; D009211:Myoglobin / Q000737:chemistry / Q000378:metabolism; D053758:Nanoparticles / Q000737:chemistry*; D054735:Phosphorothioate Oligonucleotides / Q000737:chemistry* / Q000378:metabolism; D011506:Proteins / Q000737:chemistry* / Q000378:metabolism; D019809:Streptavidin / Q000737:chemistry / Q000378:metabolism
D003432:Cross-Linking Reagents; D009211:Myoglobin; D054735:Phosphorothioate Oligonucleotides; D011506:Proteins; D004247:DNA; D019809:Streptavidin