6533b838fe1ef96bd12a48d8
RESEARCH PRODUCT
Structural stability and properties of three isoforms of the major light-harvesting chlorophyll a/b complexes of photosystem II.
Yajie ZhangTingyun KuangCheng LiuShuang LiuChunhong YangChunhong YangYe Shensubject
Gene isoformChlorophyllChlorophyll aProtein FoldingPhotosystem IIBiophysicsLight-Harvesting Protein ComplexesPhotochemistryBiochemistryThylakoidsReconstitutionchemistry.chemical_compoundPigmentPigment stoichiometryEscherichia coliThermal stabilityMajor light-harvesting chlorophyll a/b complex of photosystem IIProtein Structure QuaternaryThermostabilityPlant ProteinsChlorophyll APeasPhotosystem II Protein ComplexCell BiologyRecombinant ProteinsIsoenzymeschemistryPhotostabilityChlorophyllThylakoidvisual_artBiophysicsvisual_art.visual_art_mediumThermostabilitydescription
AbstractThree isoforms of the major light-harvesting chlorophyll (Chl) a/b complexs of photosystem II (LHCIIb) in the pea, namely, Lhcb1, Lhcb2, and Lhcb3, were obtained by overexpression of apoprotein in Escherichia coli and by successfully refolding these isoforms with thylakoid pigments in vitro. The sequences of the protein, pigment stoichiometries, spectroscopic characteristics, thermo- and photostabilities of different isoforms were analysed. Comparison of their spectroscopic properties and structural stabilities revealed that Lhcb3 differed strongly from Lhcb1 and Lhcb2 in both respects. It showed the lowest Qy transition energy, with its reddest absorption about 2 nm red-shifted, and the highest photostability under strong illuminations. Among the three isoforms, Lhcb 2 showed lowest thermal stability regarding energy transfer from Chl b to Chl a in the complexes, which implies that the main function of Lhcb 2 under high temperature stress is not the energy transfer.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-06-01 | Biochimica et biophysica acta |