Electronic structure of overstretched DNA
نویسندگان
چکیده
منابع مشابه
The structure of DNA overstretched from the 5'5' ends differs from the structure of DNA overstretched from the 3'3' ends.
It has been suggested that the structure that results when double-stranded DNA (dsDNA) is pulled from the 3'3' ends differs from that which results when it is pulled from the 5'5' ends. In this work, we demonstrate, using lambda phage dsDNA, that the overstretched states do indeed show different properties, suggesting that they correspond to different structures. For 3'3' pulling versus 5'5' pu...
متن کاملTwo distinct overstretched DNA states
The DNA double helix undergoes an 'overstretching' transition in a narrow force range near 65 pN. Despite numerous studies the basic question of whether the strands are separated or not remains controversial. Here we show that overstretching in fact involves two distinct types of double-helix reorganization: slow hysteretic 'unpeeling' of one strand off the other; and a fast, non-hysteretic tra...
متن کاملInterconversion between three overstretched DNA structures.
Double-stranded DNA can exist in multiple structures, including three recently identified overstretched structures (peeled ssDNA, DNA bubble, and S-DNA) for torsion-unconstrained DNA under large tension. Here, we report systematic studies of interconversion between these overstretched DNA structures induced by changing NaCl concentration at constant force. At forces above 70 pN where DNA exists...
متن کاملElectronic structure of wet DNA.
The electronic properties of a Z-DNA crystal synthesized in the laboratory are investigated by means of density-functional theory Car-Parrinello calculations. The electronic structure has a gap of only 1.28 eV. This separates a manifold of 12 occupied states which came from the pi guanine orbitals from the lowest empty states in which the electron is transferred to the Na+ from PO-4 groups and ...
متن کاملAn Iridatropylium Cation: Investigation of Electronic Structure
A study of the [C6 H6 Ir(PH3 )3 ]+ iridatropylium cation structure based on frontier orbital analysis, thermodynamic analysis, and natural bond orbital (NBO) theory is the main aim of the present research. Also, HOMO, LUMO energies, hardness, electrophilicity and chemical potential were calculated. Structural analysis indicated the optimized geometry shows a good agreement with the experimental...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review B
سال: 2002
ISSN: 0163-1829,1095-3795
DOI: 10.1103/physrevb.66.241104