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Related Experiment Videos

Positional requirements for the function of nif-specific upstream activator sequences.

M Buck1, J Woodcock, W Cannon

  • 1AFRC Unit of Nitrogen Fixation, University of Sussex, Brighton, UK.

Molecular & General Genetics : MGG
|November 1, 1987
PubMed
Summary

The upstream activator sequence (UAS) in Klebsiella pneumoniae nif promoters is crucial for nifA-mediated transcription activation. Studies show UAS can function in 3' positions, influencing nifF promoter transcription.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • The upstream activator sequence (UAS) is essential for activating transcription by nifA in Klebsiella pneumoniae.
  • The nifF-nifL intergenic region lacks UAS, but it is found downstream of the nifLA transcription start.
  • Investigating the functional capacity of UAS in alternative genomic locations is critical for understanding gene regulation.

Purpose of the Study:

  • To determine if nif upstream activator sequences can function effectively when placed in a 3' position relative to the transcription start site.
  • To analyze the impact of relocating the nifH UAS on nifA-dependent transcriptional activation.
  • To elucidate the role of downstream UAS motifs in regulating transcription from different promoters.

Main Methods:

Related Experiment Videos

  • Cloning the nifH UAS downstream from the NifH transcription start site.
  • Assessing nifA-dependent transcriptional activation with the UAS in a 3' location.
  • Utilizing deletion analysis to identify the role of downstream UAS motifs in nifF promoter transcription.
  • Employing promoter substitution (cat promoter) to evaluate positional effects on UAS function.

    • Main Results:

    • No activation of transcription by nifA was detected when the nifH UAS was placed in the 3' location.
    • A mild repressive effect was observed when the nifH UAS was downstream of the nifH promoter.
    • The UAS motif downstream of the nifLA promoter plays a role in transcription from the nifF promoter, despite its unusual upstream location (-263 bp).

    Conclusions:

    • The upstream activator sequence (UAS) may not function optimally or at all in a 3' position for nifA-dependent activation.
    • The position of the UAS relative to the promoter is critical for its regulatory function.
    • A downstream UAS motif, even at a significant distance, can influence transcription from an upstream promoter (nifF), suggesting complex regulatory mechanisms in nif gene expression.