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. 1983 Jun;72(2):402–408. doi: 10.1104/pp.72.2.402

Purification and Characterization of Hydroxypyruvate Reductase from Cucumber Cotyledons 1

David E Titus 1, David Hondred 1, Wayne M Becker 1
PMCID: PMC1066246  PMID: 16663015

Abstract

Hydroxypyruvate reductase (HPR), a marker enzyme of peroxisomes, has been purified to homogeneity from cotyledons of light-grown cucumber seedlings (Cucumis sativus var. Improved Long Green). In addition, the peroxisomal location of both HPR and serine-glyoxylate aminotransferase has been confirmed in cucumber cotyledons. The isolation procedure involved Polymin-P precipitation, a two-step precipitation with ammonium sulfate (35 and 50% saturation), affinity chromatography on Cibacron Blueagarose, and ion-exchange chromatography on DEAE-cellulose. HPR was purified 541-fold to a final specific activity of 525 ± 19 micromoles per minute per milligram of protein. Enzyme homogeneity was established by native and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The native molecular weight was 91 to 95 kilodaltons, approximately double the apparent subunit molecular weight of 40,500 ± 1,400. With hydroxypyruvate as substrate, the pH optimum was 7.1 and Km values were 62 ± 6 and 5.8 ± 0.7 micromolar for hydroxypyruvate and NADH, respectively. With glyoxylate as substrate, the pH optimum was 6.0, and the Km values for glyoxylate and NADH were 5700 ± 600 and 2.9 ± 0.5 micromolar, respectively. Antibodies to HPR were raised in mice (by the ascites tumor method) and in rabbits, and their monospecificity was demonstrated by a modified Western blot immunodetection technique.

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Selected References

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