0000000000006956

AUTHOR

Indulis Cielens

showing 3 related works from this author

Mutilation of RNA phage Qβ virus-like particles: from icosahedrons to rods

2000

Icosahedral virus-like particles (VLPs) of RNA phage Qbeta are stabilized by four disulfide bonds of cysteine residues 74 and 80 within the loop between beta-strands F and G (FG loop) of the monomeric subunits, which determine the five-fold and quasi-six-fold symmetry contacts of the VLPs. In order to reduce the stability of Qbeta VLPs, we mutationally converted the amino acid stretch 76-ANGSCD-81 within the FG loop into the 76-VGGVEL-81 sequence. It led to production in Escherichia coli cells of aberrant rod-like Qbeta VLPs, along with normal icosahedral capsids. The length of the rod-like particles exceeded 4-30 times the diameter of icosahedral Qbeta VLPs.

Icosahedral symmetryvirusesGenetic VectorsMolecular Sequence DataBiophysicsBiologymedicine.disease_causecomplex mixturesBiochemistryVirus-like particleStructural BiologyGeneticsmedicineAmino Acid SequenceCysteineMolecular BiologyEscherichia coliPeptide sequenceIcosahedronAlloleviviruschemistry.chemical_classificationSequence Homology Amino AcidRod-like structureVirionvirus diseasesRNASelf-assemblyCell Biologybiochemical phenomena metabolism and nutritionAmino acidCrystallographyCapsidchemistryMutagenesis Site-DirectedRNA ViralRNA phage QβVirus-like particleCysteineFEBS Letters
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Mosaic Qβ coats as a new presentation model

1998

The new protein carrier was developed on the basis of recombinant RNA phage Qbeta capsid. C-terminal UGA extension of the short form of Qbeta coat, so-called A1 extension, served as a target for presentation of foreign peptides on the outer surface of mosaic Qbeta particles. In conditions of enhanced UGA suppression, the proportion of A1-extended to short coats in mosaic particles dropped from 48% to 14%, with an increase of the length of A1 extension. A model insertion, short preS1 epitope 31-DPAFR-35 of hepatitis B surface antigen, demonstrated superficial location on the mosaic Qbeta particles and ensured specific antigenicity and immunogenicity.

AntigenicityRecombinant Fusion ProteinsGenetic VectorsBiophysicsBiologyHepatitis b surface antigenBiochemistryEpitopelaw.inventionCapsid assemblyMiceCapsidPhage QβPeptide LibraryStructural BiologylawGeneticsAnimalsHepatitis B virus preS1Cloning MolecularMolecular BiologyAllolevivirusMice Inbred BALB CCoat protein UGA suppressionVirus AssemblyImmunogenicityA1 extensionRNACell BiologyImmunogenicityVirologyMolecular biologyCapsidCarrier proteinCodon TerminatorRecombinant DNACapsid ProteinsFEBS Letters
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Efficient homologous prime-boost strategies for T cell vaccination based on virus-like particles.

2005

Induction of high frequencies of specific T cells by vaccination requires prime-boost regimens. To reach optimal immune responses, it is necessary to use different vectors for priming and boosting as e.g. DNA vaccination followed by boosting with a recombinant viral vector. Here, we show that vaccines based on virus-like particles (VLP) displaying peptide epitopes are equally effective to induce CTL responses if used in a homologous or heterologous prime-boost setting. Strikingly, high frequencies (>20% of CD8(+) cells) of protective CTL could be induced and maintained by weekly injection of VLP. Thus, the use of VLP may avoid the requirement for complicated heterologous prime-boost regi…

T cellvirusesT-LymphocytesImmunologyT-cell vaccinationPriming (immunology)HeterologousEpitopes T-LymphocyteVaccinia virusBiologycomplex mixturesEpitopeViral vectorDNA vaccinationMicemedicineVaccines DNAVacciniaImmunology and AllergyAnimalsVaccinationVirionViral VaccinesVirologyHepatitis B Core AntigensCTL*medicine.anatomical_structureImmunologyCpG IslandsFemale
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