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Published on: August 22, 2017
Expression, purification and preliminary diffraction studies of CmlS
Ryan Latimer1, Kateryna Podzelinska, Alexei Soares
1Department of Chemistry, Queen's University, Kingston, Ontario, Canada.
Summary
CmlS, a flavin-dependent halogenase, was crystallized to understand its reaction mechanism in chloramphenicol biosynthesis. This structural insight aids in elucidating the flavin-dependent halogenase family
Area of Science:
- Biochemistry
- Structural Biology
- Enzymology
Background:
- CmlS is a flavin-dependent halogenase (FDH) crucial for chloramphenicol biosynthesis in Streptomyces venezuelae.
- Understanding CmlS's reaction mechanism is key to explaining the broader substrate specificity of the FDH enzyme family.
Purpose of the Study:
- To elucidate the reaction mechanism of CmlS, a flavin-dependent halogenase.
- To provide structural insights into the flavin-dependent halogenase (FDH) family.
Main Methods:
- Recombinant expression of CmlS in Escherichia coli and subsequent purification.
- Crystallization using the hanging-drop vapour-diffusion method.
- X-ray diffraction data collection to 2.0 Å resolution.
Main Results:
- CmlS protein was successfully expressed, purified, and crystallized.
- X-ray diffraction data revealed crystal belonging to space group C2.
- Unit-cell parameters were determined: a = 208.1, b = 57.7, c = 59.9 Å, beta = 97.5°.
Conclusions:
- The structural data of CmlS provide a foundation for understanding its catalytic mechanism.
- This study contributes to the knowledge of flavin-dependent halogenases and their diverse substrate-halogenating capabilities.
