Abstract
The evolution and diversification of different types of photosynthetic reaction centers (RCs) remains an important unresolved problem. We report here novel sequence features of the core proteins from Type I RCs (RC-I) and Type II RCs (RC-II) whose analyses provide important insights into the evolution of the RCs. The sequence alignments of the RC-I core proteins contain two conserved inserts or deletions (indels), a 3 amino acid (aa) indel that is uniquely found in all RC-I homologs from Cyanobacteria (both PsaA and PsaB) and a 1 aa indel that is specifically shared by the Chlorobi and Acidobacteria homologs. Ancestral sequence reconstruction provides evidence that the RC-I core protein from Heliobacteriaceae (PshA), lacking these indels, is most closely related to the ancestral RC-I protein. Thus, the identified 3 aa and 1 aa indels in the RC-I protein sequences must have been deletions, which occurred, respectively, in an ancestor of the modern Cyanobacteria containing a homodimeric form of RC-I and in a common ancestor of the RC-I core protein from Chlorobi and Acidobacteria. We also report a conserved 1 aa indel in the RC-II protein sequences that is commonly shared by all homologs from Cyanobacteria but not found in the homologs from Chloroflexi, Proteobacteria and Gemmatimonadetes. Ancestral sequence reconstruction provides evidence that the RC-II subunits lacking this indel are more similar to the ancestral RC-II protein. The results of flexible structural alignments of the indel-containing region of the RC-II protein with the homologous region in the RC-I core protein, which shares structural similarity with the RC-II homologs, support the view that the 1 aa indel present in the RC-II homologs from Cyanobacteria is a deletion, which was not present in the ancestral form of the RC-II protein. Our analyses of the conserved indels found in the RC-I and RC-II proteins, thus, support the view that the earliest photosynthetic lineages with living descendants likely contained only a single RC (RC-I or RC-II), and the presence of both RC-I and RC-II in a linked state, as found in the modern Cyanobacteria, is a derivation from these earlier phototrophs.
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This work was supported by a research grant from the Natural Sciences and Engineering Research Council of Canada to Radhey S. Gupta.
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Khadka, B., Adeolu, M., Blankenship, R.E. et al. Novel insights into the origin and diversification of photosynthesis based on analyses of conserved indels in the core reaction center proteins. Photosynth Res 131, 159–171 (2017). https://doi.org/10.1007/s11120-016-0307-1
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DOI: https://doi.org/10.1007/s11120-016-0307-1