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RNA methylation under heat shock control.

H Bügl1, E B Fauman, B L Staker

  • 1Department of Biology, University of Michigan, Ann Arbor 48109, USA.

Molecular Cell
|September 13, 2000
PubMed
Summary
This summary is machine-generated.

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FtsJ, a heat shock protein, acts as a methyltransferase, modifying 23S ribosomal RNA (rRNA). This discovery links heat shock response to RNA metabolism, impacting ribosome function and cell growth.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • FtsJ is a recently identified heat shock protein conserved across species.
  • Its precise function, particularly its role in cellular processes, remained largely uncharacterized.

Purpose of the Study:

  • To elucidate the molecular function of the heat shock protein FtsJ.
  • To investigate the structural and biochemical properties of FtsJ and its role in cellular metabolism.

Main Methods:

  • X-ray crystallography was used to determine the 1.5 Å crystal structure of FtsJ with its cofactor, S-adenosylmethionine.
  • Biochemical assays were performed for substrate analysis, including in vitro and in vivo methylation studies.
  • Genetic techniques, including null mutations in ftsJ, were employed to assess phenotypic consequences.

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Main Results:

  • The crystal structure revealed FtsJ possesses a methyltransferase fold with a conserved, positively charged nucleic acid binding groove.
  • FtsJ was identified as an enzyme that methylates 23S ribosomal RNA (rRNA) within the 50S ribosomal subunit.
  • f tsJ null mutations resulted in altered ribosome profiles, impaired growth, and temperature sensitivity.

Conclusions:

  • FtsJ functions as a crucial methyltransferase for 23S rRNA, impacting ribosome biogenesis and function.
  • The study reveals a novel connection between the heat shock response pathway and RNA metabolism.
  • FtsJ's role highlights the intricate regulation of cellular processes under stress conditions.