8ydm
Cryo-EM structure of CaRC-LH complex from Chloroflexus aurantiacusCryo-EM structure of CaRC-LH complex from Chloroflexus aurantiacus
Structural highlights
FunctionC554_CHLAA Serves as the immediate electron donor to the oxidized BChl2 (bacteriochlorophyll dimer) that is oxidized in the first step of light-induced charge separation. Can also oxidize low-potential substrates. Publication Abstract from PubMedPhotosynthetic organisms have developed various light-harvesting antenna systems to capture light and transfer energy to reaction centers (RCs). Simultaneous utilization of the integral membrane light-harvesting antenna (LH complex) and the extrinsic antenna (chlorosomes) makes the phototrophic bacterium Chloroflexus (Cfx.) aurantiacus an ideal model for studying filamentous anoxygenic phototrophs (FAPs). Here, we determined the structure of a minimal RC-LH photocomplex from Cfx. aurantiacus J-10-fl (CaRC-LH) at 3.05-A resolution. The CaRC-LH binds only to seven LH subunits, which form a crescent-shaped antenna surrounding the movable menaquinone-10 (Q(B)) binding site of CaRC. In this complex with minimal LH units, an extra antenna is required to ensure sufficient light-gathering, providing a clear explanation for the presence of chlorosomes in Cfx. aurantiacus. More importantly, the semicircle of the antenna represents a novel RC-LH assembly pattern. Our structure provides a basis for understanding the existence of chlorosomes in Cfx. aurantiacus and the possible assembly pattern of RC-LH. Cryo-EM structure of a minimal reaction center-light-harvesting complex from the phototrophic bacterium Chloroflexus aurantiacus.,Huang G, Dong S, Ma L, Li L, Ju J, Wang MJ, Zhang JP, Sui SF, Qin X J Integr Plant Biol. 2025 Feb 6. doi: 10.1111/jipb.13853. PMID:39912559[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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