Secondary structure and membrane topology of dengue virus NS4B N-terminal 125 amino acids

Yan Li, Young Mee Kim, Jing Zou, Qing Yin Wang, Shovanlal Gayen, Ying Lei Wong, Le Tian Lee, Xuping Xie, Qiwei Huang, Julien Lescar, Pei Yong Shi, Congbao Kang

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The transmembrane NS4B protein of dengue virus (DENV) is a validated antiviral target that plays important roles in viral replication and invasion of innate immune response. The first 125 amino acids of DENV NS4B are sufficient for inhibition of alpha/beta interferon signaling. Resistance mutations to NS4B inhibitors are all mapped to the first 125 amino acids. In this study, we expressed and purified a protein representing the first 125 amino acids of NS4B (NS4B1-125). This recombinant NS4B1-125 protein was reconstituted into detergent micelles. Solution NMR spectroscopy demonstrated that there are five helices (α1 to α5) present in NS4B1-125. Dynamic studies, together with a paramagnetic relaxation enhancement experiment demonstrated that four helices, α2, α3, α4, and α5 are embedded in the detergent micelles. Comparison of wild type and V63I mutant (a mutation that confers resistance to NS4B inhibitor) NS4B1-125 proteins demonstrated that V63I mutation did not cause significant conformational changes, however, V63 may have a molecular interaction with residues in the α5 transmembrane domain under certain conditions. The structural and dynamic information obtained in study is helpful to understand the structure and function of NS4B.

Original languageEnglish (US)
Pages (from-to)3150-3157
Number of pages8
JournalBiochimica et Biophysica Acta - Biomembranes
Issue number12
StatePublished - Dec 1 2015
Externally publishedYes


  • Dengue virus
  • Membrane protein
  • NMR
  • NS4B
  • Paramagnetic relaxation enhancement

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology


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