Histone H1e interacts with small hepatitis delta antigen and affects hepatitis delta virus replication.
Hepatitis delta virus (HDV) encodes two isoforms of delta antigens (HDAgs). The small form of HDAg (SHDAg) is required for HDV RNA replication, while the large form of HDAg (LHDAg) is required for viral assembly. Using tandem affinity purification method combined with mass spectrometry, we found that linker histone H1e bound to SHDAg. The binding domain of SHDAg to histone H1e was mapped to the N-terminal 67 amino acids. Oligomerization of SHDAg was required for its interaction with histone H1e. LHDAg barely bound to histone H1e and was masked at N-terminus. The binding domain of histone H1e to SHDAg was mapped to its central globular domain. HDV replication was inhibited by N- or C-terminal deletion mutants of histone H1e and was rescued by wild-type histone H1e. We conclude that histone H1e plays a significant role in HDV replication through forming protein complex with SHDAg.
Lee
Cha-Ze
CZ
Division of Gastroenterology, Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan. czl@ccms.ntu.edu.tw
Sheu
Jin-Chuan
JC
D000818:Animals; D002460:Cell Line; D002522:Chlorocebus aethiops; D002846:Chromatography, Affinity; D003698:Hepatitis Delta Virus / Q000502:physiology*; D035923:Hepatitis delta Antigens / Q000378:metabolism*; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D013058:Mass Spectrometry; D011485:Protein Binding; D054730:Protein Interaction Domains and Motifs; D025941:Protein Interaction Mapping; D017384:Sequence Deletion; D014779:Virus Replication / Q000502:physiology*
D035923:Hepatitis delta Antigens; D006657:Histones