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Phosphoserine aminotransferase (EC 2.6.1.52), an enzyme of the “phosphorylated pathway” leading to the formation of serine, was purified from Scenedesmus obliquus, mutant C-2 A′. Purification started from the soluble supernatant of a crude cell homogenate and included different affinity and DEAE chromatographic techniques, as well as gel filtration. The purified phosphoserine aminotransferase was enriched 1537-fold and identified to be a homodimer with subunit molecular masses of 40 kDa, each. The absorption spectrum is consistent with the presence of pyridoxal-5-phosphate as cofactor. From the purified enzyme 18 amino acids of the N-terminus could be determined, showing at least 67% homology with the serC gene encoding phosphoserine aminotransferases from bacterial organisms.

Purification, Characterization and N-Terminal Sequence of Phosphoserine Aminotransferase from the Green Alga Scenedesmus obliquus, Mutant C-2 A′