Open AccessJournal Article
Seryl-tRNA Synthetases from Methanogenic Archaea: Suppression of Bacterial Amber Mutation and Heterologous Toxicity
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TLDR
Methanogenic archaea possess unusual seryl-tRNA synthetases (SerRS), evolutionarily distinct from the SerRSs found in other archaea, eucaryotes and bacteria, which presumably precluded the complementation of endogenous SerRS function in both E. coli and S. cerevisiae.Abstract:
Summary Methanogenic archaea possess unusual seryl-tRNA synthetases (SerRS), evolutionarily distinct from the SerRSs found in other archaea, eucaryotes and bacteria. Our recent X-ray structural analysis of Methanosarcina barkeri SerRS revealed an idiosyncratic N-terminal domain and catalytic zinc ion in the active site. To shed further light on substrate discrimination by methanogenic-type SerRS, we set up to explore in vivo the interaction of methanogenic-type SerRSs with their cognate tRNAs in Escherichia coli or Saccharomyces cerevisiae. The expression of various methanogenic-type SerRSs was toxic for E. coli, resulting in the synthesis of erroneous proteins, as revealed by b-galactosidase stability assay. Although SerRSs from methanogenic archaea recognize tRNAs Ser from all three domains of life i nv itro, the toxicity presumably precluded the complementation of endogenous SerRS function in both, E. coli and S. cerevisiae. However, despite the observed toxicity, coexpression of methanogenic-type SerRS with its cognate tRNA suppressed bacterial amber mutation.read more
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Genetic Code Expansion in Rhodobacter sphaeroides to Incorporate Noncanonical Amino Acids into Photosynthetic Reaction Centers.
TL;DR: The ability to incorporate noncanonical amino acids in R. sphaeroides expands research capabilities in the photosynthetic field and provides insights into the hurdles that can be involved in host transfer of amber suppression systems from E. coli.
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Tight regulation, modulation, and high-level expression by vectors containing the arabinose PBAD promoter.
TL;DR: The tight regulation of the PBAD promoter is exploited to study the phenotypes of null mutations of essential genes and the use of pBAD vectors as an expression system is explored.
Journal ArticleDOI
Compilation of tRNA sequences and sequences of tRNA genes
TL;DR: Alignment of the sequences, which is most compatible with the tRNA phylogeny and known three-dimensional structures of tRNA, is used.
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Aminoacyl-tRNA synthesis.
Michael Ibba,Dieter Söll +1 more
TL;DR: Current knowledge of the biochemical, structural, and evolutionary facets of aminoacyl-tRNA synthesis is reviewed, mainly prompted by the advent of whole genome sequencing and the availability of vast body of structural data.
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Genetic studies of the lac repressor: IV. Mutagenic specificity in the lacI gene of Escherichia coli
TL;DR: The frequencies of occurrence of amber and ochre mutations arising from the G · C → A · T transition have been compared for different mutagens, revealing several striking hotspots.
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