NDK catalyzes the reversible transfer of γ-phosphate between nucleoside triphosphates (NTPs) and diphosphates (NDPs), maintaining cellular nucleotide pools critical for DNA/RNA synthesis and energy metabolism . In Dehalococcoides, this enzyme may support metabolic processes linked to reductive dechlorination, though direct evidence remains limited. Structural studies of NDK homologs (e.g., in Aspergillus flavus and plants) reveal conserved ferredoxin-like folds and catalytic residues (Arg-104, His-117, Asp-120) essential for phosphotransferase activity .
Recombinant NDK is typically generated via heterologous expression in E. coli, followed by purification (e.g., affinity chromatography) . Although Dehalococcoides-specific NDK expression systems are not described in the provided sources, analogous workflows apply:
Enzyme Kinetics:
Potential Roles in *Dehalococcoides*:
Experimental Priorities:
Cloning and characterization of Dehalococcoides NDK genes.
Structural analysis to identify unique active-site adaptations.
Dehalococcoides strains are pivotal in bioremediation due to their ability to detoxify chlorinated ethenes . While NDK’s role here is speculative, its manipulation could enhance metabolic resilience. For instance, NDK inhibitors (e.g., flavonoids) might modulate microbial activity in contaminated sites .
KEGG: deb:DehaBAV1_0373