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Introduction: The burden of chronic hepatitis B virus (HBV) results in almost a million deaths per year. The most common treatment for chronic hepatitis B infection is long-term nucleoside analogs (NUC) or one-year interferon-alpha (pegylated or non-pegylated) therapy before or after NUC therapy. Unfortunately, these therapies rarely result in HBV functional cure because they do not eradicate HBV from the nucleus of the hepatocytes, where the covalently closed circular DNA (cccDNA) is formed and/or where the integrated HBV DNA persists in the host genome. Hence, the search continues for novel antiviral therapies that target different steps of the HBV replication cycle to cure chronically infected HBV individuals and eliminate HBV from the liver reservoirs.
Areas Covered: The authors focus on capsid assembly modulators (CAMs). These molecules are unique because they impact not only one but several steps of HBV viral replication, including capsid assembly, capsid trafficking into the nucleus, reverse transcription, pre-genomic RNA (pgRNA), and polymerase protein co-packaging.
Expert Opinion: Mono- or combination therapy, including CAMs with other HBV drugs, may potentially eliminate hepatitis B infections. Nevertheless, more data on their potential effect on HBV elimination is needed, especially when used daily for 6-12 months.
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http://dx.doi.org/10.1080/17460441.2023.2239701 | DOI Listing |
J Am Chem Soc
September 2025
Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.
Among the different types of HIV-1 maturation inhibitors, those that stabilize the junction between the capsid protein C-terminal domain (CA) and the spacer peptide 1 (SP1) within the immature Gag lattice are promising candidates for antiretroviral therapies. Here, we report the atomic-resolution structure of CA-SP1 assemblies with the small-molecule maturation inhibitor PF-46396 and the assembly cofactor inositol hexakisphosphate (IP6), determined by magic angle spinning (MAS) NMR spectroscopy. Our results reveal that although the two PF-46396 enantiomers exhibit distinct binding modes, they both possess similar anti-HIV potency.
View Article and Find Full Text PDFMicrobiol Spectr
September 2025
Department of Cell Biology, Kyoto Pharmaceutical University, Kyoto, Japan.
Kaposi's sarcoma-associated herpesvirus (KSHV) belongs to the Gammaherpesvirinae subfamily. During the lytic phase of herpesviruses, viral capsids form in the host cell nucleus, and the replicated viral genome is packaged into these capsids. The herpesviral genome is replicated as a precursor head-to-tail concatemer consisting of tandemly repeated genomic units, each flanked by terminal repeats (TRs).
View Article and Find Full Text PDFJHEP Rep
October 2025
Janssen Pharmaceutica NV, Beerse, Belgium.
Background & Aims: Previous studies showed that combination treatment with short interfering RNA JNJ-73763989 (JNJ-3989) ± capsid assembly modulator bersacapavir (JNJ-56136379) and nucleos(t)ide analogs (NAs) was well tolerated by patients with chronic HBV (CHB), with JNJ-3989 dose-dependent reductions in viral markers, including HBsAg. The open-label, single-arm phase IIa PENGUIN study (NCT04667104) evaluated this regimen plus pegylated interferon alpha-2a (PegIFN-α2a) in patients with virologically suppressed CHB.
Methods: Patients who were either HBeAg-positive or -negative virologically suppressed and taking NAs were included; all received JNJ-3989 ± bersacapavir for 24 weeks (some either did not start or discontinued bersacapavir as a result of protocol amendment) with PegIFN-α2a added during the final 12 weeks of treatment.
HIV Med
September 2025
Department of Medical Microbiology, Faculty of Medicine, Hacettepe University, Ankara, Türkiye.
Introduction: Monitoring transmitted drug resistance is crucial for guiding first-line antiretroviral therapy (ART) and controlling the rising HIV epidemic in Türkiye. This study aimed to determine the prevalence of transmitted antiretroviral resistance to protease inhibitors (PIs), nucleoside reverse transcriptase inhibitors (NRTIs), non-nucleoside reverse transcriptase inhibitors (NNRTIs), integrase strand transfer inhibitors (INSTIs) and capsid assembly inhibitors (CAIs). We also assessed the distribution of HIV-1 subtypes and circulating recombinant forms (CRFs) at one of the main national referral centres in Türkiye.
View Article and Find Full Text PDFPestic Biochem Physiol
November 2025
Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, Tianjin 300387, China. Electronic address:
The extensive use of highly toxic and residual pesticides has a significant negative impact on agricultural production and the ecological environment. The development of new green antiviral agents has become a major demand for ensuring the development of green ecological agriculture. Indole alkaloids are widely present in nature and have diverse biological activities.
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