Investigating the domain motions of an asymmetric ABC transporter (997.1)
Bibliographic record
Abstract
ATP‐binding cassette (ABC) transporters transport lipids, sterols, peptides, toxins, nutrients, drugs and ions across membranes and consist of two transmembrane domains (TMDs) and two nucleotide‐binding domains (NBDs). Asymmetric ABC transporters feature specific mutations in one of the two ATP‐binding sites (the degenerate site), resulting in a reduced ATPase activity compared to the non‐mutated site (the consensus site). It has been proposed that in asymmetric ABC transporters ATP remains bound at the degenerate site, while ATP‐binding and ‐hydrolysis at the consensus site drive the transport cycle. Here, we investigate the effects of ATP‐binding and domains' motions of the heterodimeric transporter TM287/288 (Hohl et al., Nat. Struct. Mol. Biol. 2012). We have performed molecular dynamics (MD) simulations, for a total simulation time of ca. 10 microseconds, on the structure of TM287/288 in different nucleotide‐bound states. Our results show that in the absence of ATP at the consensus site, the simulation systems with and without ATP at the degenerate site do not completely dissociate at the NBD level, but reach an intermediate state in which contacts between the NBDs are still observed.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".