Abstract

Hepatitis D virus (HDV) is a defective virus that relies on hepatitis B virus envelope proteins to complete its replication cycle. The HDV genome contains two isoforms of hepatitis delta antigen: the small and the large hepatitis delta antigens (S- and L-HDAg). Here we report the 1H, 13C and 15N backbone and side chain resonance assignments of an N-terminally truncated form of S-HDAg (SΔ60), which lacks the 1-60 oligomerization domain. We derived secondary structures based on NMR chemical shifts, which will be used in further structural and functional studies. We show that SΔ60 is partially disordered, and that the central structured part contains two well-defined α-helices of 22 and 17 residues, respectively. A temperature titration allowed to identify the residues involved in hydrogen bonds.

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