Structural investigation on the intrinsically disordered N-terminal region of HPV16 E7 protein

BMB Rep. 2016 Aug;49(8):431-6. doi: 10.5483/bmbrep.2016.49.8.021.

Abstract

Human papillomavirus (HPV) is the major cause of cervical cancer, a deadly threat to millions of females. The early oncogene product (E7) of the high-risk HPV16 is the primary agent associated with HPV-related cervical cancers. In order to understand how E7 contributes to the transforming activity, we investigated the structural features of the flexible N-terminal region (46 residues) of E7 by carrying out N-15 heteronuclear NMR experiments and replica exchange molecular dynamics simulations. Several NMR parameters as well as simulation ensemble structures indicate that this intrinsically disordered region of E7 contains two transient (10-20% populated) helical pre-structured motifs that overlap with important target binding moieties such as an E2F-mimic motif and a pRb-binding LXCXE segment. Presence of such target-binding motifs in HPV16 E7 provides a reasonable explanation for its promiscuous target-binding behavior associated with its transforming activity. [BMB Reports 2016; 49(8): 431-436].

Publication types

  • News

MeSH terms

  • Amino Acid Sequence
  • Humans
  • Intrinsically Disordered Proteins / chemistry*
  • Models, Molecular
  • Papillomavirus E7 Proteins / chemistry*
  • Protein Structure, Secondary
  • Proton Magnetic Resonance Spectroscopy

Substances

  • Intrinsically Disordered Proteins
  • Papillomavirus E7 Proteins
  • oncogene protein E7, Human papillomavirus type 16