Effect of monogalactosyldiacylglycerol on the interaction between photosystem II core complex and its antenna complexes in liposomes of thylakoid lipids
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Abstract
The non-bilayer lipid monogalactosyldiacylglycerol (MGDG) is the most abundant type of lipid in the thylakoid membrane and plays an important role in regulating the structure and function of photosynthetic membrane proteins. In this study, we have reconstituted the isolated major light-harvesting complexes of photosystem II (PSII) (LHCIIb) and a preparation consisting of PSII core complexes and minor LHCII of PSII (PSIICC) into liposomes that consisted of digalactosyldiacylglycerol (DGDG), sulfoquinovosyldiacylglycerol (SQDG) and phosphatidylglycerol (PG), with or without MGDG. Transmission electron microscopy and freeze-fracture studies showed unilamellar proteoliposomes, and demonstrated that most of the MGDG is incorporated into bilayer structures. The impact of MGDG on the functional interaction between LHCIIb and PSIICC was investigated by low temperature (77 K) fluorescence emission spectra and the photochemical activity of PSII. The additional incorporation of LHCIIb into liposomes containing PSIICC markedly increased oxygen evolution of PSIICC. Excitation at 480 nm of chlorophyll (Chl) b in LHCIIb stimulated a characteristic fluorescence emission of the Chl a in PSII (684.2 nm), rather than that of the Chl a in LHCIIb (680 nm) in the LHCIIb–PSIICC proteoliposomes, which indicated that the energy was transferred from LHCIIb to PSIICC in liposome membranes. Increasing the percentage of MGDG in the PSIICC–LHCIIb proteoliposomes enhanced the photochemical activity of PSII, due to a more efficient energy transfer from LHCIIb to PSIICC and, thus, an enlarged antenna cross section of PSII.
Keywords
Photosystem II core complex Light-harvesting complex II Monogalactosyldiacylglycerol Liposome Photochemical activityAbbreviations
- BBY
PSII-enriched thylakoid membranes
- Chl
Chlorophyll
- DCIP
2,6-dichlorophenol indophenol
- DGDG
Digalactosyldiacylglycerol
- DPC
1,5-diphenylcarbazide
- EM
Electron micrograph
- LHCII
The light-harvesting complexes of photosystem II with apoproteins Lhcb1-6
- LHCIIb
Major light-harvesting complexes of photosystem II with apoproteins Lhcb1-3
- MGDG
Monogalactosyldiacylglycerol
- PC
Phosphatidylcholine
- PG
Phosphatidylglycerol
- PS
Photosystem
- PSIICC
Photosystem II preparation containing core complexes, minor LHCII and part of LHCIIb
- SQDG
Sulfoquinovosyldiacylglycerol
- TLC
Thin layer chromatography
- Triton X-100
Octylphenolpoly (ethyleneglycolether)10
Notes
Acknowledgements
This work was supported by the National Sciences Foundation of China (No. 30670498, to C. Y. and No. 30500101, to Z. H.); the Deutsche Forschungsgemeinschaft (Pa 324/5–3, to H.P.); and the Knowledge Innovation Program of the Chinese Academy of Sciences (No. KSCX2-YW-R-137, to C.Y.).
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