5V8K

Homodimeric reaction center of H. modesticaldum

Summary for 5V8K

• Entry DOI: 10.2210/pdb5v8k/pdb
• Related: 1JB0
• Descriptor: p800 reaction center core protein, 4,4'-Diaponeurosporene, proteinsubunit pshX, ... (11 entities in total)
• Functional Keywords: photosynthesis, reaction center, homodimeric
• Biological source: Heliobacterium modesticaldum; More
• Total number of polymer chains: 2
• Total formula weight: 97897.33

Authors

Gisriel, C.,Sarrou, I.,Ferlez, B.,Golbeck, J.,Redding, K.E.,Fromme, R. (deposition date: 2017-03-22, release date: 2017-09-06, Last modification date: 2024-03-06)

Primary citation

Gisriel, C.,Sarrou, I.,Ferlez, B.,Golbeck, J.H.,Redding, K.E.,Fromme, R.
Structure of a symmetric photosynthetic reaction center-photosystem.
Science, 357:1021-1025, 2017

PubMed Abstract: Reaction centers are pigment-protein complexes that drive photosynthesis by converting light into chemical energy. It is believed that they arose once from a homodimeric protein. The symmetry of a homodimer is broken in heterodimeric reaction-center structures, such as those reported previously. The 2.2-angstrom resolution x-ray structure of the homodimeric reaction center-photosystem from the phototroph exhibits perfect symmetry. The core polypeptide dimer and two small subunits coordinate 54 bacteriochlorophylls and 2 carotenoids that capture and transfer energy to the electron transfer chain at the center, which performs charge separation and consists of 6 (bacterio)chlorophylls and an iron-sulfur cluster; unlike other reaction centers, it lacks a bound quinone. This structure preserves characteristics of the ancestral reaction center, providing insight into the evolution of photosynthesis.

PubMed: 28751471
DOI: 10.1126/science.aan5611

Experimental method

X-RAY DIFFRACTION (2.2 Å)