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Selenoprotein synthesis in archaea.

M Rother1, A Resch, R Wilting

  • 1Lehrstuhl für Mikrobiologie der Universität München, Institut für Genetik und Mikrobiologie, Maria Ward Stra section signe 1a, D-80638 Munich, Germany.

Biofactors (Oxford, England)
|September 25, 2001
PubMed
Summary
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Researchers identified new selenoproteins and their biosynthesis machinery in archaea. Unlike bacteria, archaea use a unique SECIS element in mRNA for selenocysteine insertion, requiring further study.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • Genome sequencing of archaea has enabled identification of selenoproteins and their biosynthesis machinery.
  • Selenoproteins were previously identified only in Methanococcus and Methanopyrus genera, primarily involved in energy metabolism.
  • Selenocysteine insertion in archaea, like bacteria and eukarya, uses a UGA codon and requires specific tRNA and selenophosphate.

Purpose of the Study:

  • To identify encoded selenoproteins and components of the selenocysteine biosynthesis and insertion machinery in archaea.
  • To investigate the differences in selenocysteine insertion mechanisms between archaea and bacteria.
  • To characterize the role of specific proteins in the archaeal selenocysteine insertion process.

Main Methods:

Related Experiment Videos

  • Genome sequence analysis to identify selenoproteins and related machinery.
  • Comparative analysis of archaeal and bacterial selenocysteine insertion systems.
  • Heterologous expression of archaeal selenoprotein genes in M. maripaludis.

    • Main Results:

    • Identification of numerous selenoproteins and most components for selenocysteine biosynthesis and insertion in archaea.
    • Discovery of a unique SECIS (SECelenium Insertion Sequence) element in the 3' non-translated region of archaeal mRNA, differing from the bacterial system.
    • Characterization of a SelB homolog that does not bind to the SECIS element, suggesting the involvement of additional proteins.

    Conclusions:

    • Archaea possess a distinct selenocysteine insertion mechanism compared to bacteria, notably the SECIS element's location.
    • The archaeal system likely requires additional protein factors beyond SelB for efficient selenocysteine insertion.
    • Future studies using M. maripaludis genetic system will elucidate the precise mechanism of archaeal selenocysteine insertion.