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Updated: Mar 3, 2026
11:31
Establishment of a High-throughput Setup for Screening Small Molecules That Modulate c-di-GMP Signaling in Pseudomonas aeruginosa
Published on: June 30, 2016
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The Streptomyces master regulator BldD binds c-di-GMP sequentially to create a functional BldD2-(c-di-GMP)4 complex
Maria A Schumacher1, Wenjie Zeng1, Kim C Findlay2
1Department of Biochemistry, Duke University School of Medicine, Durham, NC 27701, USA.
Nucleic Acids Research
|April 28, 2017
Summary
Soil bacteria Streptomyces use a tetrameric form of cyclic diguanylic acid (c-di-GMP) to regulate antibiotic production. This study reveals the ordered assembly mechanism of this complex, crucial for bacterial development.
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- Streptomyces bacteria exhibit complex developmental transitions linked to antibiotic biosynthesis.
- These transitions are regulated by the master repressor BldD, which binds 3 -5 cyclic diguanylic acid (c-di-GMP).
- c-di-GMP acts as a second messenger, existing in various oligomeric states (monomers, dimers, tetramers) to regulate cellular functions.
Purpose of the Study:
- To elucidate the mechanism of higher-order oligomeric complex assembly of c-di-GMP on effector proteins.
- To investigate the regulatory significance of intermediates in the c-di-GMP assembly pathway.
- To understand how the tetrameric c-di-GMP complex specifically interacts with BldD.
Main Methods:
- Investigated the binding kinetics and stoichiometry of c-di-GMP with BldD.
- Utilized biochemical assays to characterize the assembly process.
- Analyzed the functional implications of the BldD2-(c-di-GMP)4 complex formation.
Main Results:
- Demonstrated that c-di-GMP binds to BldD through an ordered, sequential mechanism.
- Showed that the formation of the BldD2-(c-di-GMP)4 complex is essential for BldD function.
- Characterized the unique tetrameric binding of c-di-GMP to BldD, distinct from its monomeric form at physiological concentrations.
Conclusions:
- The assembly of the BldD2-(c-di-GMP)4 complex is a critical regulatory step in Streptomyces development.
- Understanding this ordered binding mechanism provides insights into how second messengers control complex cellular processes.
- This study highlights the functional significance of higher-order c-di-GMP oligomers in bacterial regulation.
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