Structure of the Alternative Complex III from <i>Flavobacterium johnsoniae</i> in a Supercomplex with Cytochrome <i>c</i> Oxidase
Bibliographic record
Abstract
Alternative Complex III (ACIII), like Complex III, catalyzes the oxidation of membrane‐bound quinol and reduction of cytochrome c , but is structurally unrelated to Complex III. We solubilized the ACIII directly from membranes of Flavobacterium johnsoniae using styrene maleic acid (SMA) copolymer in the absence of traditional detergents. The ACIII was isolated as a functional 1:1 supercomplex with an aa 3 ‐type cytochrome c oxidase (cyt aa 3 ) within SMA copolymer nanodiscs. We determined the structure of the ACIII component of the supercomplex to 3.4 Å resolution by cryo‐EM and constructed an atomic model for its six subunits, two of which are anchored to the lipid bilayer with N‐terminal triacylated cysteine residues, resolved here for the first time. The structure also contains a [3Fe‐4S] cluster, a [4Fe‐4S] cluster, and six hemes c along with 11 phospholipid molecules. The ACIII is in direct contact with subunit III of the cyt aa 3 component of the supercomplex. The structure revealed that this subunit is structurally modified from the canonical form of subunit III to facilitate association with ACIII, suggesting a specific role of the supercomplex in the respiratory system of this bacterium.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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".