Abstract
A cDNA clone that is inducible by light stimulation was cloned by a differential screening method from a cDNA library of the protozoan Blepharisma japonicum, and the light-dependent expression was checked by semi-quantitative reverse transcription polymerase chain reaction analysis. Sequence analysis showed that the cDNA encodes a glutathione S-transferase (GST) that has not been characterized in the protozoa. Multiple alignment of B. japonicum GST (BjGST1), known protozoan, and mammalian α-, μ-, π-, σ-, θ-, ζ-, κ-, and ω-class GSTs suggested that the BjGST1 may be a novel class GST. Furthermore, highly conserved amino acid residues among the GSTs and the substrate specificity of recombinant BjGST1 showed that BjGST1 is related to α-, μ-, π-, and σ-class GSTs rather than the other class of GSTs.
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