Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:2.7.7.6 (RNA polymerase)
 34,946 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Live Shigella flexneri 2a and Shigella sonnei Phase I vaccine candidate strains with two virulence-reducing markers were constructed through stepwise incorporation of weakly attenuating purine auxotrophy with subsequent rifampicin-resistance (RNA polymerase) mutation to yield optimal attenuation. These vaccine candidate strains showed an unaltered plasmid profile; did not cause keratoconjunctivitis in the Sereny test, while being excreted for a short but still marked period and providing partial protection from wild-strain infection; exhibited for guinea-pig conjunctival epithelia, HeLa cells and rat enterocytes a maintained invasiveness with reduced intracellular multiplication with little, if any, reversible cell damage; and produced, just as their ultrasonic lysates, no exudative reaction in the rabbit gut loop test.
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PMID:Live Shigella flexneri 2a and Shigella sonnei I vaccine candidate strains with two attenuating markers. I. Construction of vaccine candidate strains with retained invasiveness but reduced intracellular multiplication. 218 Feb 30

Moraxella bovis pili have been shown to play a major role in both infectivity and protective immunity of bovine infectious keratoconjunctivitis. Sonicated M. bovis DNA from the piliated strain EPP63 was inserted into the vector lambda gt11 with EcoRI linkers. Recombinant phage were screened with an oligonucleotide probe based on the amino-terminal portion of the DNA sequence of a Neisseria gonorrhoeae pilin gene. Two candidate phages produced a protein that comigrated with EPP63 beta pilin in sodium dodecyl sulfate-polyacrylamide gels and bound anti-pilus antisera. The 1.9-kilobase insert from one of these, lambda gt11M182, was subcloned in both orientations into pBR322, forming the plasmids pMxB7 and pMxB9, both of which produced beta pilin, as did pMxB12, a HindIII deletion derivative of pMxB7. In HB101(pMxB12), the M. bovis pilin protein was shown to be primarily localized in the inner membrane. The entire 939-base-pair insert of pMxB12 was sequenced, revealing a ribosome binding site just upstream of the coding region and an AT-rich region further upstream containing some potential RNA polymerase recognition sites. The translation of the sequence predicts a six-amino-acid leader sequence preceding the phenylalanine that begins the mature protein. Codon usage analysis of the M. bovis beta pilin gene revealed greater use of the CUA codon for leucine than usual for a well-expressed Escherichia coli gene. Comparisons of the M. bovis EPP63 beta pilin protein sequence with other pilin gene sequences are presented.
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PMID:Cloning and sequencing of a Moraxella bovis pilin gene. 286 Nov 94

The vaccine candidates were constructed through stepwise incorporation of weakly attenuated purine auxotrophy with subsequent rifampicin resistance (RNA polymerase) mutation to yield optimal attenuation. These strains showed a maintained invasiveness for conjunctival epithelia. Therefore, while not causing keratoconjunctivitis, they were excreted for a short but marked period and provided partial protection in the Sereny test. Children tolerated the maximum dose of 1-3 x 10(9) colony-forming units (c.f.u.) of lyophilized vaccine without side effects. This total dose distributed among three oral inoculations, induced coproantibodies in 70% of recipients during the first three months. However, the single application of this total dose for primary immunization or booster proved to be more efficient: 90% of the subjects had markedly elevated titres for not less than six months.
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PMID:Shigella flexneri 2a and sonnei I vaccine with two attenuating markers: construction, tolerability and immunogenicity in 143 children aged 3-17 years. 843 18