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Related Experiment Videos

PAS domains. Common structure and common flexibility.

Jocelyne Vreede1, Michael A van der Horst, Klaas J Hellingwerf

  • 1Department of Microbiology, Swammerdam Institute for Life Sciences, University of Amsterdam, 1018WV, Amsterdam, The Netherlands.

The Journal of Biological Chemistry
|March 18, 2003
PubMed
Summary
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PAS domains are crucial for signal transduction. This study reveals the PAS domain of photoactive yellow protein folds independently, unaffected by a removed motif, and shares conformational flexibility with other PAS domains.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • PAS (PER-ARNT-SIM) domains are vital sensor protein modules in signal transduction across diverse organisms.
  • Structural analyses show conserved alpha/beta-folds in PAS domains, despite minimal sequence homology.
  • The photoactive yellow protein's PAS domain, a proposed structural prototype, includes a unique N-terminal helix-turn-helix motif.

Purpose of the Study:

  • To determine if the PAS domain of photoactive yellow protein can fold independently.
  • To investigate the structural and dynamic properties of PAS domains.
  • To explore potential common mechanisms of signal communication in PAS domains.

Main Methods:

  • Atomic resolution structure determination of a photoactive yellow protein deletion mutant.

Related Experiment Videos

  • Computational simulations of known PAS domain structures.

    • Main Results:

    • The PAS domain of the photoactive yellow protein deletion mutant folds correctly and independently.
    • Removal of the N-terminal helix-turn-helix motif does not impact PAS domain folding.
    • Computer simulations indicate structural and conformational flexibility conservation across known PAS domains.

    Conclusions:

    • The PAS domain is a stable, independently folding unit.
    • PAS domains exhibit conserved structural and dynamic characteristics, suggesting a unified signaling mechanism.
    • These findings advance understanding of signal transduction pathways mediated by PAS domains.