Europhysics Letters

  Previous Article | Back to Volume | Next Article
  Abstract | References | Citation | Download | Preview | Statistics
Sample volume 2
Title Type II DNA: When the interfacial energy becomes negative
Author Poulomi Sadhukhan, Jaya Maji, Somendra M. Bhattacharjee
Abstract An important step in transcription of a DNA base sequence to a protein is the initiation from the exact starting point, called promoter region. We propose a physical mechanism for identification of the promoter region, which relies on a new classification of DNAs into two types, Type I and Type II, like superconductors, depending on the sign of the energy of the interface separating the zipped and the unzipped phases. This is determined by the energies of helical ordering and stretching over two independent length scales. The negative interfacial energy in Type II DNA leads to domains of helically ordered state separated by defect regions, or blobs, enclosed by the interfaces. The defect blobs, pinned by non-coding promoter regions, would be physically distinct from all other types of bubbles. We also show that the order of the melting transition under a force is different for Type I and Type II.
[1] Bhattacharjee S. M., J. Phys. A, 33 (2000) L423; cond-mat/9912297.
[2] Marenduzzo D., Bhattacharjee S. M., Maritan A., Orlandini E. and Seno F., Phys. Rev. Lett., 88 (2002) 028102.
[3] Kumar S. and Li M. S., Phys. Rep., 486 (2010) 1.
[4] Gotoh O., Adv. Biophys., 16 (1983) 1.
[5] de Gennes P., C. R. Acad. Sci. - Ser. IV - Phys., 2 (2001) 1505.
[6] Wats on J . D. et al., Molecular Biology of the Gene, 6th edition (Pearson Education, Singapore) 2008.
[7] Goodman B. B., Rev. Mod. Phys., 36 (1964) 12.
[8] Cao X. Q., Zeng J. and Yan H., Phys. Rev. E, 77 (2008) 041908.
[9] Choi C. H. et al., Biophys. J., 95 (2008) 597.
[10] Mameren J. van et al., Proc. Natl. Acad. Sci. U.S.A., 106 (2009) 18231.
[11] Marenduzzo D., Orlandini E., Seno F. and Trovato A., Phys. Rev. E, 81 (2010) 051926.
[12] Randall G. L., Zechiedrich L. and Pettitt B. M., Nucleic Acids Res., 37 (2009) 5568.
[13] Mueller-Planitz F. and Herschlag D., Nucl. Acids
Res., 35 (2007) 3764.
[14] Abrikosov A. A., Sov. Phys. JETP, 5 (1957) 1174.
Download Full PDF Download
  Previous Article | Back to Volume | Next Article
Search in articles
Journal Published articles
EPL 102
Journal Hits
EPL 254927
Journal Downloads
EPL 375
Total users online -