A comparative look at structural variation among RC–LH1 ‘Core’ complexes present in anoxygenic phototrophic bacteria

Gardiner, Alastair T.; Nguyen-Phan, Tu C.; Cogdell, Richard J.

doi:10.1007/s11120-020-00758-3

Title: A comparative look at structural variation among RC–LH1 ‘Core’ complexes present in anoxygenic phototrophic bacteria

Journal Article · Tue May 19 00:00:00 EDT 2020 · Photosynthesis Research

DOI:https://doi.org/10.1007/s11120-020-00758-3· OSTI ID:1801407

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Univ. of Glasgow, Scotland (United Kingdom); Czech Academy of Sciences, Třeboň (Czech Republic)
Czech Academy of Sciences, Třeboň (Czech Republic)

All purple photosynthetic bacteria contain RC–LH1 ‘Core’ complexes. The structure of this complex from Rhodobacter sphaeroides, Rhodopseudomonas palustris and Thermochromatium tepidum has been solved using X-ray crystallography. Recently, the application of single particle cryo-EM has revolutionised structural biology and the structure of the RC–LH1 ‘Core’ complex from Blastochloris viridis has been solved using this technique, as well as the complex from the non-purple Chloroflexi species, Roseiflexus castenholzii. It is apparent that these structures are variations on a theme, although with a greater degree of structural diversity within them than previously thought. Furthermore, it has recently been discovered that the only phototrophic representative from the phylum Gemmatimonadetes, Gemmatimonas phototrophica, also contains a RC–LH1 ‘Core’ complex. At present only a low-resolution EM-projection map exists but this shows that the Gemmatimonas phototrophica complex contains a double LH1 ring. This short review compares these different structures and looks at the functional significance of these variations from two main standpoints: energy transfer and quinone exchange.

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Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0001035

OSTI ID:: 1801407

Journal Information:: Photosynthesis Research, Vol. 145, Issue 2; ISSN 0166-8595

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Title: A comparative look at structural variation among RC–LH1 ‘Core’ complexes present in anoxygenic phototrophic bacteria

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