6533b85bfe1ef96bd12bab87
RESEARCH PRODUCT
A novel target of lithium therapy.
Rosario Gil-mascarellRamón SerranoJosé María BellésPedro L. RodriguezJosé M. López-coronadoLynne Yenushsubject
Inositol-14-bisphosphateDNA ComplementaryBicinePhosphataseMolecular Sequence DataBiophysicschemistry.chemical_elementSaccharomyces cerevisiaeLithiummedicine.disease_causeBiochemistrychemistry.chemical_compoundStructural BiologyNucleotidasesComplementary DNAPhosphataseGeneticsmedicineEscherichia coliHumansAmino Acid SequenceCloning MolecularMolecular BiologyEscherichia coliIC50Chromatography High Pressure Liquidchemistry.chemical_classificationExpressed Sequence TagsBase Sequence3′-Phosphoadenosine 5′-phosphateCell BiologyMolecular biologyAdenosineAdenosine MonophosphatePhosphoric Monoester HydrolasesAdenosine DiphosphateEnzymechemistryBiochemistryLithiummedicine.drugHumandescription
Phosphatases converting 3'-phosphoadenosine 5'-phosphate (PAP) into adenosine 5'-phosphate are of fundamental importance in living cells as the accumulation of PAP is toxic to several cellular systems. These enzymes are lithium-sensitive and we have characterized a human PAP phosphatase as a potential target of lithium therapy. A cDNA encoding a human enzyme was identified by data base screening, expressed in Escherichia coli and the 33 kDa protein purified to homogeneity. The enzyme exhibits high affinity for PAP (K(m)1 microM) and is sensitive to subtherapeutic concentrations of lithium (IC(50)=0.3 mM). The human enzyme also hydrolyzes inositol-1, 4-bisphosphate with high affinity (K(m)=0.4 microM), therefore it can be considered as a dual specificity enzyme with high affinity (microM range) for both PAP and inositol-1,4-bisphosphate. Hydrolysis of inositol-1,4-bisphosphate was also inhibited by lithium (IC(50)=0.6 mM). Thus, we present experimental evidence for a novel target of lithium therapy, which could explain some of the side effects of this therapy.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2000-02-17 | FEBS letters |