Partington JC, Bolwell GP. Purification of polyphenol oxidase free of the storage protein patatin from potato tuber.
PHYTOCHEMISTRY 1996;
42:1499-1502. [PMID:
8783836 DOI:
10.1016/0031-9422(96)00185-9]
[Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Routine protein purification to homogeneity from potato tuber, as from other storage tissues and seeds, is often hindered due to the large amounts of storage protein present. In potato, patatin, the major storage protein of the tuber, often contaminates preparations. The present work describes the purification of polyphenol oxidase (PPO) from the potato tuber (Solanum tuberosum cv Cara) to homogeneity including the critical step of hydrophobic chromatography on Octyl-Sepharose which was sufficient to completely remove patatin. The purified PPO was found to be a doublet of M(r) 60,000 and 69,000 when analysed by SDS-PAGE with a Km 4.3 +/- 0.3 mM for L-dihydroxyphenylalanine. Both bands were found to have similar N-terminal corresponding to PPO isoforms when sequenced.
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