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양영남,Rana B. Safarova,박소연,Yasuhito Sakuraba,오민혁,Ismayil S. Zulfugarov,이신범,Ayumi Tanaka,백남천,이춘환 한국식물학회 2019 Journal of Plant Biology Vol.62 No.1
The stay-green mutant of Arabidopsis thaliana,ore10 forms stable light-harvesting complex II (LHCII)aggregates during dark-induced senescence, which showed asingle base deletion (G1351) in the coding region of thepheophytinase (PPH) gene. PPH specifically dephytylatesthe Mg-free chlorophyll (Chl) pigment pheophytin, yieldingpheophorbide. In both ore10 and pph-1 mutants, pheophytina accumulated due to the deficiency of PPH gene, but theamount was relatively smaller than that of degraded Chl, andmost of the pheophytin a was bound to the stable LHCIIforming aggregates with some other Chl-protein (CP)complexes. Comparison of Chl a/b ratios in thylakoids,aggregates, and LHCII indicated that the suppression of Chlb to Chl a conversion was stronger when Chl b reductasewas missing and weak when PPH is missing in the large Chlcatabolic complex, which allowed the partial degradation ofChl b. These results suggest that the PPH-dependent pathway isnot specific for LHCII, but common for all CP complexes,including LHCII. In PPH-deficient mutants, the degradationof LHCII was suppressed by the formation of aggregates,and some of the remaining CP complexes and pheophytin awere included in the aggregates. Non-included CP complexeswere degraded via an unknown mechanism.
Oh, Min-Hyuk,Safarova, Rana B.,Eu, Young-Jae,Zulfugarov, Ismayil S.,Kim, Jin-Hong,Hwang, Hong-Jin,Lee, Chin-Bum,Lee, Choon-Hwan Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.4
Photosystem I (PSI) is severely damaged by chilling at $4^{\circ}C$ in low light, especially in the chilling sensitive plant cucumber. To investigate the early events in PSI photoinhibition, we examined structural changes in the level of pigment-protein complexes in cucumber leaves in comparison with pea leaves. The complexes were separated on a native green gel and an increase in the intensity of a band was observed only in light-chilled cucumber leaves. The 77 k fluorescence emission spectrum of this green band indicated that the band was mainly composed of PSI with light-harvesting complex I. Each lane was cut from the green gel and separated on a fully denaturing SDS-PAGE in the second dimension. The new green gel band observed after light-chilling in cucumber leaves lacked 19, 18, and 16.5 kDa polypeptides. These results suggest that light-chilling facilitates the release of three peripheral polypeptides as an early event of chilling stress in vivo, which results in the inactivation of PSI in intact cucumber leaves.