PEG effects on excitonic properties of LH2 from Rhodobacter sphaeroides 2.4.1 in different environments

被引：0

作者：

Hu, Yuan -Yuan ^{[1
]}

Liu, Xiao-Lin ^{[1
]}

Yao, Hai -Dan ^{[1
]}

Jiang, Yang -lin ^{[1
]}

Li, Kang ^{[1
]}

Chen, Ming-Qing ^{[1
]}

Wang, Peng ^{[1
]}

Zhang, Jian-Ping ^{[1
]}

机构：

[1] Renmin Univ China, Dept Chem, Key Lab Adv Light Convers Mat & Biophoton, Beijing 100872, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2023年 / 821卷

基金：

中国国家自然科学基金;

关键词：

PEG effect; Lipid bilayers; Spectroscopic methods; Detergent micelles; Excitonic properties; LIGHT-HARVESTING COMPLEX; THERMOCHROMATIUM-TEPIDUM; INTERMOLECULAR INTERACTIONS; EXCITATION DYNAMICS; CRYSTAL-STRUCTURE; RPS.-ACIDOPHILA; LIPID-BILAYER; EARLY-STAGE; SPECTROSCOPY; RESOLUTION;

D O I：

10.1016/j.cplett.2023.140477

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effects of Polyethylene glycol (PEG) on B800 and B850 excitonic properties of the Light-Harvesting complex 2 (LH2) from Rhodobacter (Rba.) sphaeroides 2.4.1 in micellar solutions of detergents and phospholipid bilayers were investigated by a series of spectroscopies. Compared to the micellar solution, in the lipid bilayer, the lateral force applied on LH2 changed the excitonic structure of B850 and weakened the excitonic interaction between B800 molecules. In micelles, PEG addition causes LH2 aggregation, resulting in the enhancement of B850 excitonic coupling inter-complexes and conformational change of the bound carotenoid (Car). In liposomes, PEG addition causes similar to 37 % fluorescence quenching of B850 excitons in the embedded LH2s by changing the surrounding hydration state.

引用

页数：8

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