1S00

PHOTOSYNTHETIC REACTION CENTER DOUBLE MUTANT FROM RHODOBACTER SPHAEROIDES WITH ASP L213 REPLACED WITH ASN AND ARG M233 REPLACED WITH CYS IN THE CHARGE-SEPARATED D+QAQB- STATE

1S00 の概要

• エントリーDOI: 10.2210/pdb1s00/pdb
• 関連するPDBエントリー: 1AIG 1AIJ 1RVJ 1RY5 1RZH 1RZZ
• 分子名称: Reaction center protein L chain, Reaction center protein M chain, Reaction center protein H chain, ... (10 entities in total)
• 機能のキーワード: bacterial photosynthesis, rhodobacter sphaeroides, proton transfer pathway, revertant, integral membrane protein, photosynthesis
• 由来する生物種: Rhodobacter sphaeroides; 詳細
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 203293.61

構造登録者

Xu, Q.,Axelrod, H.L.,Abresch, E.C.,Paddock, M.L.,Okamura, M.Y.,Feher, G. (登録日: 2003-12-29, 公開日: 2004-04-13, 最終更新日: 2023-08-23)

主引用文献

Xu, Q.,Axelrod, H.L.,Abresch, E.C.,Paddock, M.L.,Okamura, M.Y.,Feher, G.
X-Ray Structure Determination of Three Mutants of the Bacterial Photosynthetic Reaction Centers from Rb. sphaeroides; Altered Proton Transfer Pathways.
STRUCTURE, 12:703-715, 2004

PubMed Abstract: In the photosynthetic reaction center (RC) from Rhodobacter sphaeroides, the reduction of a bound quinone molecule Q(B) is coupled with proton uptake. When Asp-L213 is replaced by Asn, proton transfer is inhibited. Proton transfer was restored by two second-site revertant mutations, Arg-M233-->Cys and Arg-H177-->His. Kinetic effects of Cd(2+) on proton transfer showed that the entry point in revertant RCs to be the same as in the native RC. The structures of the parental and two revertant RCs were determined at resolutions of 2.10, 1.80, and 2.75 A. From the structures, we were able to delineate alternate proton transfer pathways in the revertants. The main changes occur near Glu-H173, which allow it to substitute for the missing Asp-L213. The electrostatic changes near Glu-H173 cause it to be a good proton donor and acceptor, and the structural changes create a cavity which accommodates water molecules that connect Glu-H173 to other proton transfer components.

PubMed: 15062092
DOI: 10.1016/j.str.2004.03.001

実験手法

X-RAY DIFFRACTION (2.6 Å)