The Tryptophan-Rich Region of HIV gp41 and the Promotion of Cholesterol-Rich Domains
Bibliographic record
Abstract
The peptide N-acetyl-KWASLWNWFNITNWLWYIK-amide has a sequence that corresponds to the juxtamembrane region of the HIV-1 gp41 fusion protein. We have studied how cholesterol modulates the interaction of this peptide with membranes containing cholesterol using differential scanning calorimetry, circular dichroism, fluorescence spectroscopy, and nuclear magnetic resonance. We find that this peptide is less able to sequester cholesterol into domains than is N-acetyl-LWYIK-amide. On the other hand, the peptide N-acetyl-LASWIK-amide, which corresponds to a segment of HIV-2 and SIV gp41 fusion proteins, has intermediate potency between N-acetyl-KWASLWNWFNITNWLWYIK-amide and N-acetyl-LWYIK-amide in forming areas enriched in cholesterol, even though it does not have a cholesterol recognition/interaction amino acid consensus sequence (CRAC). We suggest that the difference between HIV-1 and HIV-2 in their requirements for glycosphingolipids in determining their tropism is related to their difference in partitioning to cholesterol-rich domains in biological membranes.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| 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 | 0.001 |
| 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 teacher head, 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".