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Evolution of photosynthetic reaction centers: insights from the structure of the heliobacterial reaction center

Overview of attention for article published in Photosynthesis Research, March 2018
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About this Attention Score

  • In the top 5% of all research outputs scored by Altmetric
  • One of the highest-scoring outputs from this source (#5 of 823)
  • High Attention Score compared to outputs of the same age (94th percentile)
  • High Attention Score compared to outputs of the same age and source (90th percentile)

Mentioned by

news
5 news outlets
blogs
2 blogs
wikipedia
6 Wikipedia pages

Citations

dimensions_citation
57 Dimensions

Readers on

mendeley
71 Mendeley
citeulike
1 CiteULike
Title
Evolution of photosynthetic reaction centers: insights from the structure of the heliobacterial reaction center
Published in
Photosynthesis Research, March 2018
DOI 10.1007/s11120-018-0503-2
Pubmed ID
Authors

Gregory S. Orf, Christopher Gisriel, Kevin E. Redding

Abstract

The proliferation of phototrophy within early-branching prokaryotes represented a significant step forward in metabolic evolution. All available evidence supports the hypothesis that the photosynthetic reaction center (RC)-the pigment-protein complex in which electromagnetic energy (i.e., photons of visible or near-infrared light) is converted to chemical energy usable by an organism-arose once in Earth's history. This event took place over 3 billion years ago and the basic architecture of the RC has diversified into the distinct versions that now exist. Using our recent 2.2-Å X-ray crystal structure of the homodimeric photosynthetic RC from heliobacteria, we have performed a robust comparison of all known RC types with available structural data. These comparisons have allowed us to generate hypotheses about structural and functional aspects of the common ancestors of extant RCs and to expand upon existing evolutionary schemes. Since the heliobacterial RC is homodimeric and loosely binds (and reduces) quinones, we support the view that it retains more ancestral features than its homologs from other groups. In the evolutionary scenario we propose, the ancestral RC predating the division between Type I and Type II RCs was homodimeric, loosely bound two mobile quinones, and performed an inefficient disproportionation reaction to reduce quinone to quinol. The changes leading to the diversification into Type I and Type II RCs were separate responses to the need to optimize this reaction: the Type I lineage added a [4Fe-4S] cluster to facilitate double reduction of a quinone, while the Type II lineage heterodimerized and specialized the two cofactor branches, fixing the quinone in the QA site. After the Type I/II split, an ancestor to photosystem I fixed its quinone sites and then heterodimerized to bind PsaC as a new subunit, as responses to rising O2 after the appearance of the oxygen-evolving complex in an ancestor of photosystem II. These pivotal events thus gave rise to the diversity that we observe today.

Mendeley readers

Mendeley readers

The data shown below were compiled from readership statistics for 71 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 71 100%

Demographic breakdown

Readers by professional status Count As %
Researcher 13 18%
Student > Ph. D. Student 11 15%
Student > Postgraduate 6 8%
Student > Master 6 8%
Student > Bachelor 5 7%
Other 11 15%
Unknown 19 27%
Readers by discipline Count As %
Biochemistry, Genetics and Molecular Biology 23 32%
Agricultural and Biological Sciences 10 14%
Chemistry 4 6%
Environmental Science 2 3%
Physics and Astronomy 2 3%
Other 7 10%
Unknown 23 32%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 48. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 16 March 2024.
All research outputs
#842,266
of 24,710,887 outputs
Outputs from Photosynthesis Research
#5
of 823 outputs
Outputs of similar age
#19,302
of 334,275 outputs
Outputs of similar age from Photosynthesis Research
#2
of 10 outputs
Altmetric has tracked 24,710,887 research outputs across all sources so far. Compared to these this one has done particularly well and is in the 96th percentile: it's in the top 5% of all research outputs ever tracked by Altmetric.
So far Altmetric has tracked 823 research outputs from this source. They receive a mean Attention Score of 3.7. This one has done particularly well, scoring higher than 99% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 334,275 tracked outputs that were published within six weeks on either side of this one in any source. This one has done particularly well, scoring higher than 94% of its contemporaries.
We're also able to compare this research output to 10 others from the same source and published within six weeks on either side of this one. This one has scored higher than 8 of them.