Structural basis for aerobic anoxygenic photosynthesis in the reaction center-light-harvesting 1 (RC-LH1) supercomplex of Dinoroseobacter shibae.

ABSTRACT: Aerobic anoxygenic phototrophic (AAP) bacteria are essential for oceanic carbon cycling. However, their architecture and structural adaptations of their photosynthetic systems to ensure adequate light harvesting, electron transport, and oxidative resilience in oxygen-rich environments remain poorly understood. In this study, we present a 2.4-Å cryo-EM structure of the reaction center-light-harvesting 1 (RC-LH1) supercomplex from Dinoroseobacter shibae DFL-12, a marine AAP bacterial symbiont of benthic dinoflagellates. This RC-LH1 supercomplex features a closed LH1 ring comprising 17 αβ-subunits, each containing two spheroidenones per αβ-heterodimer-a previously unreported configuration in phototrophic bacteria. The cytochrome subunit of the RC is truncated to three hemes, in contrast to th

SUBMITTER: Liu ZK 

PROVIDER: S-EPMC12618627 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature