LET THERE BE LIGHT (BUT NOT TOO MUCH): MOLECULAR EVOLUTION OF LIGHT‐HARVESTING COMPLEXES
Bibliographic record
Abstract
The light‐harvesting antennas common to all photosynthetic eukaryotes belong to two protein familes: the Chl a‐binding core complex family (e.g. CP47, CP43), and the LHC superfamily, whose members bind a variety of Chls. The former are all chloroplast‐encoded and have high sequence similarity to their cyanobacterial homologs; the latter are all nucleus‐encoded and have a much more complex relationship with each other and their (presumed) cyanobacterial ancestors. Phylogenetic analysis of the LHC superfamily protein sequences show that they follow the endosymbiotic history of their hosts and suggest that the ancestral cyanobacterial genes were copied to the nucleus soon after the establishment of the primary endosymbiosis. Both families have members whose role appears to be related to photoprotection rather than light‐harvesting, suggesting that these families may have originated as stress‐response proteins. In support of this, all members of the LHC superfamily bind significant amounts of carotenoid, and much of the variation between them resides in the bewildering array of different carotenoids they bind. In fact, it has been suggested that this family originated as carotenoid‐binding proteins and only later acquired Chl (Gantt, E. 1998; Photosynthesis: Mechanisms & Effects I, pp. 239‐246).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".