SWNT-DNA and SWNT-polyC hybrids: AFM study and computer modeling.
Hybrids of carbon single-walled nanotubes (SWNT) with fragmented single or double-stranded DNA (fss- or fds-DNA) or polyC were studied by Atom Force Microscopy (AFM) and computer modeling. It was found that fragments of the polymer wrap in several layers around the nanotube, forming a strand-like spindle. In contrast to the fss-DNA, the fds-DNA also forms compact structures near the tube surface due to the formation of self-assembly structures consisting of a few DNA fragments. The hybrids of SWNT with wrapped single-, double- or triple strands of the biopolymer were simulated, and it was shown that such structures are stable. To explain the reason of multi-layer polymeric coating of the nanotube surface, the energy of the intermolecular interactions between different components of polyC was calculated at the MP2/6-31++G** level as well as the interaction energy in the SWNT-cytosine complex.
Karachevtsev
M V
MV
B. I. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Science of Ukraine, Kharkov 61103, Ukraine.
Lytvyn
O S
OS
Stepanian
S G
SG
Leontiev
V S
VS
Adamowicz
L
L
Karachevtsev
V A
VA
D004247:DNA / Q000737:chemistry*; D004277:DNA, Single-Stranded / Q000737:chemistry*; D018625:Microscopy, Atomic Force / Q000379:methods; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D011066:Poly C / Q000737:chemistry*; D013816:Thermodynamics
D004277:DNA, Single-Stranded; D037742:Nanotubes, Carbon; D011066:Poly C; D004247:DNA