Viral hepatitis remains a worldwide public health problem.The hepatitis D virus(HDV)must either coinfect or superinfect with the hepatitis B virus(HBV).HDV contains a small RNA genome(approximately 1.7 kb)with a singl...Viral hepatitis remains a worldwide public health problem.The hepatitis D virus(HDV)must either coinfect or superinfect with the hepatitis B virus(HBV).HDV contains a small RNA genome(approximately 1.7 kb)with a single open reading frame(ORF)and requires HBV supplying surface antigens(HBsAgs)to assemble a new HDV virion.During HDV replication,two isoforms of a delta antigen,a small delta antigen(SDAg)and a large delta antigen(LDAg),are produced from the same ORF of the HDV genome.The SDAg is required for HDV replication,whereas the interaction of LDAg with HBsAgs is crucial for packaging of HDV RNA.Various clinical outcomes of HBV/HDV dual infection have been reported,but the molecular interaction between HBV and HDV is poorly understood,especially regarding howHBV and HDV compete with HBsAgs for assembling virions.In this paper,we review the role of endoplasmic reticulum stress induced by HBsAgs and the molecular pathway involved in their promotion of LDAg nuclear export.Because the nuclear sublocalization and export of LDAg is regulated by posttranslational modifications(PTMs),including acetylation,phosphorylation,and isoprenylation,we also summarize the relationship among HBsAg-induced endoplasmic reticulum stress signaling,LDAg PTMs,and nuclear export mechanisms in this review.展开更多
基金Supported by Grants(CMRPD-1C0811)from Chang Gung Memorial Hospital,the National Science Council and the National Health Research Institute to Lo SJ
文摘Viral hepatitis remains a worldwide public health problem.The hepatitis D virus(HDV)must either coinfect or superinfect with the hepatitis B virus(HBV).HDV contains a small RNA genome(approximately 1.7 kb)with a single open reading frame(ORF)and requires HBV supplying surface antigens(HBsAgs)to assemble a new HDV virion.During HDV replication,two isoforms of a delta antigen,a small delta antigen(SDAg)and a large delta antigen(LDAg),are produced from the same ORF of the HDV genome.The SDAg is required for HDV replication,whereas the interaction of LDAg with HBsAgs is crucial for packaging of HDV RNA.Various clinical outcomes of HBV/HDV dual infection have been reported,but the molecular interaction between HBV and HDV is poorly understood,especially regarding howHBV and HDV compete with HBsAgs for assembling virions.In this paper,we review the role of endoplasmic reticulum stress induced by HBsAgs and the molecular pathway involved in their promotion of LDAg nuclear export.Because the nuclear sublocalization and export of LDAg is regulated by posttranslational modifications(PTMs),including acetylation,phosphorylation,and isoprenylation,we also summarize the relationship among HBsAg-induced endoplasmic reticulum stress signaling,LDAg PTMs,and nuclear export mechanisms in this review.
