0000000000596093

AUTHOR

Una Lazdina

showing 3 related works from this author

Molecular Basis for the Interaction of the Hepatitis B Virus Core Antigen with the Surface Immunoglobulin Receptor on Naive B Cells

2001

ABSTRACTThe nucleocapsid of the hepatitis B virus (HBV) is composed of 180 to 240 copies of the HBV core (HBc) protein. HBc antigen (HBcAg) capsids are extremely immunogenic and can activate naive B cells by cross-linking their surface receptors. The molecular basis for the interaction between HBcAg and naive B cells is not known. The functionality of this activation was evidenced in that low concentrations of HBcAg, but not the nonparticulate homologue HBV envelope antigen (HBeAg), could prime naive B cells to produce anti-HBc in vitro with splenocytes from HBcAg- and HBeAg-specific T-cell receptor transgenic mice. The frequency of these HBcAg-binding B cells was estimated by both hybridom…

CD4-Positive T-LymphocytesImmunologyNaive B cellAntigen presentationMolecular Sequence DataImmunoglobulin Variable RegionMice Transgenicmedicine.disease_causeAntibodies ViralMicrobiologyMiceAntigenVirologymedicineAnimalsHumansAmino Acid SequenceReceptors ImmunologicHepatitis B virusAntigen PresentationB-LymphocytesMice Inbred BALB Cbiologyvirus diseasesAntibodies MonoclonalVirologyMolecular biologyHepatitis B Core Antigensdigestive system diseasesPeptide FragmentsVirus-Cell InteractionsHBcAgHBeAgImmunoglobulin MImmunoglobulin MInsect Sciencebiology.proteinMice Inbred CBAImmunoglobulin Light ChainsBinding Sites AntibodyAntibodyImmunoglobulin Heavy ChainsSequence Alignment
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Short synthetic CDR-peptides forming the antibody combining site of the monoclonal antibody against RNA bacteriophage fr neutralize the phage activit…

1996

The construction of a mouse hybridoma FRS2 secreting neutralizing monoclonal antibody specific for RNA bacteriophages fr, MS2 and GA is reported. The genes encoding the variable domains of the monoclonal antibody FRS2 heavy and light chains were cloned and sequenced and the corresponding complementarity determining region (CDR) peptides were chemically synthesized. The CDR-peptides were tested for their ability to neutralize the activity of RNA phage fr and related RNA phages MS2 and GA. The CDR-derived peptides H2, L2 and L3 interacted with the fr phage particles and neutralized fr phage activity. Two of these peptides-H2 and L3 also had the ability to neutralize partly the activity of rel…

medicine.drug_classvirusesImmunologyMolecular Sequence DataImmunoglobulin Variable Regionchemical and pharmacologic phenomenaEnzyme-Linked Immunosorbent AssayComplementarity determining regionRNA PhagesMonoclonal antibodyBacteriophageMiceAntigenNeutralization TestsBacteriophage MS2medicineImmunology and AllergyAnimalsAmino Acid SequenceCloning MolecularMicroscopy ImmunoelectronMice Inbred BALB CbiologyBase SequenceRNAAntibodies MonoclonalGeneral MedicineRNA Phagesbiology.organism_classificationMolecular biologyPeptide Fragmentsbiology.proteinAntibodyHuman antibodies and hybridomas
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Priming of cytotoxic T cell responses to exogenous hepatitis B virus core antigen is B cell dependent

2003

The hepatitis B virus (HBV) core antigen (HBcAg) has a unique ability to bind a high frequency of naive human and murine B cells. The role of HBcAg-binding naive B cells in the immunogenicity of HBcAg is not clear. The HBcAg-binding properties of naive B cells were characterized using HBcAg particles with mutated spike region (residues 76-85) sequences. Deletion of residues 76-85 (HBcDelta76-85) destroyed naive B cell binding, whereas deletion of residues 79-85 did not. HBcAg particles with an Ile instead of the natural Ala at position 80 did not bind naive B cells, whereas reversion of Ile80--Ala restored B cell binding. Destroying the B cell-binding ability of HBcAg had a marginal effect …

Hepatitis B virusMolecular Sequence DataNaive B cellPriming (immunology)Biologymedicine.disease_causeMiceAntigenVirologymedicineAnimalsCytotoxic T cellHepatitis B VaccinesAmino Acid SequenceHepatitis B AntibodiesB cellHepatitis B virusB-LymphocytesVaccines SyntheticBinding SitesImmunogenicityVirionvirus diseasesHepatitis BHepatitis B Core AntigensVirologyRecombinant Proteinsdigestive system diseasesMice Inbred C57BLHBcAgmedicine.anatomical_structureImmunizationT-Lymphocytes Cytotoxic
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