9LT4

Cryo-EM structure of light harvesting complex 2 from Ery. sanguineus

これはPDB形式変換不可エントリーです。

9LT4 の概要

• エントリーDOI: 10.2210/pdb9lt4/pdb
• EMDBエントリー: 63365
• 分子名称: Light-harvesting protein B-800/814 alpha chain, Light-harvesting protein B-800-850 beta chain, BACTERIOCHLOROPHYLL A, ... (4 entities in total)
• 機能のキーワード: light harvesting complex 2, erythrobacte sanguineus, photosynthesis
• 由来する生物種: Erythrobacter sanguineus; 詳細
• タンパク質・核酸の鎖数: 18
• 化学式量合計: 145964.15

構造登録者

Yue, X.-Y.,Wang, G.-L.,Yu, L.-J. (登録日: 2025-02-05, 公開日: 2025-12-10, 最終更新日: 2026-02-25)

主引用文献

Yue, X.Y.,Wang, G.L.,Zou, M.J.,Ma, F.,Wang-Otomo, Z.Y.,Madigan, M.T.,Yu, L.J.
Cryo-EM structures of photocomplexes from the free-living aerobic anoxygenic phototrophic bacterium Erythrobacter sanguineus.
Structure, 34:334-, 2026

PubMed Abstract: Aerobic anoxygenic phototrophic bacteria (AAPB) are widely distributed in nature and they are important members of the marine phototrophic community. However, a structural and functional understanding of the AAPB photosynthetic apparatus is still lacking. Here, we present cryo-EM structures of the LH1-RC (core) and LH2 (peripheral) photocomplexes from the model aerobic phototroph Erythrobacter (Ery.) sanguineus. The LH1 αβ-heterodimers bind the carotenoids bacteriorubixanthinal and caloxanthin-pigments that are absent from anaerobic anoxygenic phototrophs-to form a closed ring structure. Ery. sanguineus LH1-RC contains a lipid-anchored polypeptide unrelated to any of the auxiliary proteins identified in the core complexes of purple bacteria so far. The Ery. sanguineus LH2 complex shows unique absorption characteristics, with its Q transition being blue-shifted to 814 nm. This work provides structural insights into the unusual photosynthetic properties of AAPB and points to new avenues to further explore their biology.

PubMed: 41274286
DOI: 10.1016/j.str.2025.10.017

実験手法

ELECTRON MICROSCOPY (2.74 Å)