Purification of a single major form of microsomal cytochrome P-450 from tulip bulbs (Tulipa gesneriana L.).

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Abstract
Microsomal cytochrome P-450 from tulip bulbs (Tulipa gesneriana L., Balalaika) was purified to an almost electrophoretically homogeneous preparation. The specific content of cytochrome P-450 in the final preparation was 6.68nmol/mg protein, which was 30-fold enriched from that of the solubilized fractions of microsomes. The molecular weight of purified cytochrome P-450 by SDS-gel electrophoresis is 52, 500. The Oxidized form of the purified cytochrome P-450 had absorption peaks at 392, 552, and 645 nm and the absolute reduced CO spectrum peaked at 448 nm. Judged spectrally, the purified cytochrome P-450 is in high spin in the oxidized state. Antiserum against this cytochrome P-450 previously has shown to be highly specific for its antigen but showed a single precipitin line with solubilized microsomal proteins from tulip bulbs of several other cultivars. The physiological role of this cytochrome P-450, however, is unknown in these dormant tulip bulbs.

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