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Spectral properties of chromophore containing fragments prepared from pea pisum sativum phytochrome by limited proteolysis


Plant & Cell Physiology 24(4): 713-718
Spectral properties of chromophore containing fragments prepared from pea pisum sativum phytochrome by limited proteolysis
Five chromophore-containing fragments were prepared from pea phytochrome in PR [phytochrome red absorbing form] form (monomer MW 114,000) by limited proteolysis with trypsin, thermolysin or chymotrypsin, and their absorption and circular dichroism (CD) spectra were determined. The fragments of MW 62,100 and 56,400 showed photoreversible transformation between PR and PFR [phytochrome for red absorbing form] like phytochrome. the smaller fragments of MW 40,300, 39,000 and 33,000 showed an absorption maximum at 657-660 nm (P660) which was transformed to a bleached form (PBL) after brief red-light exposure. The phototransformation between P660 and PBL was repeatedly reversible. Both P660 and PBL showed a negative CD band in red region like PR, in contrast with PFR which has a positive band in far-red region. The nature of a chromophore domain of phytochrome and spectral properties of PBL are discussed.


Accession: 006459773



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