NDLI: Temperature dependence of light-induced absorbance changes associated with chlorophyll photooxidation in manganese-depleted core complexes of photosystem II

Content Provider	Springer Nature Link
Author	Zabelin, A. A. Shkuropatova, V. A. Shkuropatov, A. Ya. Shuvalov, V. A.
Copyright Year	2015
Abstract	Mid-infrared (4500-1150 cm–1) absorbance changes induced by continuous illumination of Mn-depleted core complexes of photosystem II (PSII) from spinach in the presence of exogenous electron acceptors (potassium ferricyanide and silicomolybdate) were studied by FTIR difference spectroscopy in the temperature range 100–265 K. The FTIR difference spectrum for photooxidation of the chlorophyll dimer P680 was determined from the set of signals associated with oxidation of secondary electron donors (β-carotene, chlorophyll) and reduction of the primary quinone QA. On the basis of analysis of the temperature dependence of the P 680 + /P680 FTIR spectrum, it was concluded that frequencies of 131-keto-C=O stretching modes of neutral chlorophyll molecules PD1 and PD2, which constitute P680, are similar to each other, being located at ∼1700 cm–1. This together with considerable difference between the stretching mode frequencies of keto groups of P D1 + and P+ D2 cations (1724 and 1709 cm–1, respectively) is in agreement with a literature model (Okubo et al. (2007) Biochemistry, 46, 4390–4397) suggesting that the positive charge in the P 680 + dimer is mainly localized on one of the two chlorophyll molecules. A partial delocalization of the charge between the PD1 and PD2 molecules in P 680 + is supported by the presence of a characteristic electronic intervalence band at ∼3000 cm–1. It is shown that a bleaching band at 1680 cm–1 in the P 680 + /P680 FTIR spectrum does not belong to P680. A possible origin of this band is discussed, taking into account the temperature dependence (100–265 K) of light-induced absorbance changes of PSII core complexes in the visible spectral region from 620 to 720 nm.
Starting Page	1279
Ending Page	1287
Page Count	9
File Format	PDF
ISSN	00062979
Journal	Biochemistry (Moscow)
Volume Number	80
Issue Number	10
e-ISSN	16083040
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-10-17
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	core complex of photosystem II FTIR spectroscopy chlorophyll photooxidation radical cation Biochemistry Bioorganic Chemistry Microbiology Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Biochemistry Biophysics Geriatrics and Gerontology

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