Efficient formation of hemoglobin bis-tetramers <i>via</i> selective acetylation of α-subunit amino groups by methyl acetyl phosphate
Bibliographic record
Abstract
protein into its constituent non-functional αβ dimers when present outside red cells, providing the possibility of being an acellular oxygen carrier in circulation. However, studies of cross-linked Hb (xlHb) in circulation established effects consistent with scavenging of endogenous nitric oxide, leading to hypertension. Bis-tetramers, composed of coupled Hb tetramers, are sufficiently large to avoid penetration of endothelia, thereby blocking access to endogenous nitric oxide. Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) joins two azide-functionalized xlHbs to each end of a bis-alkyne to form bis-tetramers. The process critically depends on formation of a cross-link between lysyl amino groups of the β-subunits while avoiding reactions with amino groups in the α-subunits. Highly selective acetylation of α-subunit amino groups with methyl acetyl phosphate (MAP) effectively directs subsequent cross-linking to the β-subunits. This outcome leads to efficient production of hemoglobin bis-tetramers by CuAAC.
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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) | 0.001 | 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".