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Spectral effects of protochlorophyllide aggregation


Molekulyarnaya Biologiya (Moscow) 19(4): 915-925
Spectral effects of protochlorophyllide aggregation
Protochlorophyllide isolated from etiolated leaves through self-assembly forms in solid films aggregated structures with main absorption maxima at 630 (PChd630) and 638 nm (PChd638), and fluorescence maxima at 633 and 640 nm, respectively. In the ammonia vapour each form is rearranged into the structure absorbing at 655 nm and with the fluorescence maximum of about 658 nm. In the presence of ammonium hydroxide the self-assembly of PChd655 was also observed in the aqueous solution of the pigment. In all the systems pChd655 is characterized by thermolability. The heating up to 70.degree. C causes its transformation into PChd630 and PChd638. The oxidation rate for PChd655 is faster in comparison to shortwave forms. PChd655 self-assembly as shown by measurements of solid films occurs through the formation of two types of the intermolecular bonds, which involve ketogroups of cyclopentanone rings keto C.dbd.0..HN(R)..Mg) and carboxylgroups of the pyrrole ring IV (propyl C.dbd.0..HN(R)..Mg). During the self-assembly if shortwave forms carbonyl groups of the molecules are not involved in the intermolecular interaction. The study on CD-spectra leads to the conclusion that PChd655, unlike PChd 630 and PChd 638, has the regular structure, which may consist of dimers with approximately parallel mutual molecular arrangement. The protochlorophyllide forms studied model the forms of the chlorophyll (chlorophyllide) precursor in plants. Peculiarities of the protochlorophyllide intermolecular interaction and the state of the chlorophyll (chlorophyllide) precusor in plants are discussed.


Accession: 006459656



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