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Structural dissection of the CMP-pseudaminic acid synthetase, PseF.
Tessa Keenan1, Andrew R Cowan2, Emily K P Flack3
1Department of Chemistry, University of York, York YO10 5DD, UK.
Structure (London, England : 1993)
|October 11, 2024
Summary
Aeromonas caviae PseF (AcPseF) is a metal-dependent enzyme crucial for bacterial virulence. Structural and biochemical studies reveal its specific substrate binding and dynamic movements, aiding immune evasion.
Area of Science:
- Biochemistry
- Structural Biology
- Microbiology
Background:
- Pseudaminic acid is a bacterial sugar involved in virulence and immune evasion.
- CMP-Pse5Ac7Ac synthetase (PseF) catalyzes the final step in CMP-Pse5Ac7Ac biosynthesis.
Purpose of the Study:
- To biochemically and structurally characterize PseF from Aeromonas caviae (AcPseF).
- To understand the enzyme's substrate specificity and binding mechanism.
Main Methods:
- Enzyme activity assays under varying pH and temperature.
- X-ray crystallography to determine enzyme structure.
- Analysis of enzyme-substrate interactions.
Main Results:
- AcPseF exhibits metal-dependent activity across a wide pH and temperature range.
- The enzyme displays dynamic movements upon substrate binding.
- AcPseF specifically discriminates Pse5Ac7Ac through active site interactions and hydrophobic pocket formation.
- The enzyme binds the CMP-Pse5Ac7Ac side chain in its lowest energy conformation.
Conclusions:
- AcPseF is a metal-dependent enzyme with specific substrate recognition crucial for bacterial virulence.
- Structural insights reveal the mechanism of substrate discrimination and binding conformation.
Keywords:
Aeromonas caviaeCMP-Pseudaminic acidCMP-Pseudaminic acid synthetasePseFpseudaminic acidtg conformationulosonic acidMore Related Videos
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