5Y5S

Structure of photosynthetic LH1-RC super-complex at 1.9 angstrom resolution

Summary for 5Y5S

• Entry DOI: 10.2210/pdb5y5s/pdb
• Descriptor: Photosynthetic reaction center cytochrome c subunit, SULFATE ION, 1,2-DIPALMITOYL-PHOSPHATIDYL-GLYCEROLE, ... (25 entities in total)
• Functional Keywords: lh1-rc, photosynthesis, purple bacteria
• Biological source: Thermochromatium tepidum; More
• Total number of polymer chains: 36
• Total formula weight: 425933.51

Authors

Yu, L.-J.,Suga, M.,Wang-Otomo, Z.-Y.,Shen, J.-R. (deposition date: 2017-08-09, release date: 2018-04-11, Last modification date: 2025-09-17)

Primary citation

Yu, L.-J.,Suga, M.,Wang-Otomo, Z.-Y.,Shen, J.R.
Structure of photosynthetic LH1-RC supercomplex at 1.9 angstrom resolution.
Nature, 556:209-213, 2018

PubMed Abstract: Light-harvesting complex 1 (LH1) and the reaction centre (RC) form a membrane-protein supercomplex that performs the primary reactions of photosynthesis in purple photosynthetic bacteria. The structure of the LH1-RC complex can provide information on the arrangement of protein subunits and cofactors; however, so far it has been resolved only at a relatively low resolution. Here we report the crystal structure of the calcium-ion-bound LH1-RC supercomplex of Thermochromatium tepidum at a resolution of 1.9 Å. This atomic-resolution structure revealed several new features about the organization of protein subunits and cofactors. We describe the loop regions of RC in their intact states, the interaction of these loop regions with the LH1 subunits, the exchange route for the bound quinone Q with free quinone molecules, the transport of free quinones between the inside and outside of the LH1 ring structure, and the detailed calcium-ion-binding environment. This structure provides a solid basis for the detailed examination of the light reactions that occur during bacterial photosynthesis.

PubMed: 29618814
DOI: 10.1038/s41586-018-0002-9

Experimental method

X-RAY DIFFRACTION (1.9 Å)