Uncovering the structural basis for the mechanical properties of elastin
Bibliographic record
Abstract
The mechanical properties of elastin, including its elasticity, resilience, and stress relaxation, arise from its unique block copolymer structure, comprising hydrophobic (HD) and cross-linking (CLD) domains. To investigate the role of molecular structures of individual hydrophobic and cross-linking domains in modulating mechanical properties, we performed extensive atomistic molecular dynamics simulations of three peptides: hydrophobic [h = (GVPGV)7], cross-linking (x = A5KAAKYGA) domains, and a hybrid peptide (h-x = GVPGVA5KAAKYGA). The study of the h-x peptide allowed us to examine the interplay between hydrophobic and cross-linking domains and their combined effect on structural and mechanical properties. At equilibrium, all peptides sampled heterogeneous and highly disordered structural ensembles. Hydrophobic peptide h predominantly adopts sparse and transient β-turns, while peptides x and h-x form transient α- and 310-helical structures with moderate propensities. Distinct mechanical properties were uncovered for the single domain h and both cross-linking peptides. Peptide h showed high extensibility, low elastic modulus, and elastic recoil primarily driven by the hydrophobic effect, whereas peptides x and h-x displayed greater stiffness and low extensibility consistent with the structural roles of HDs and CLDs in elastin. Peptide h-x shows a biphasic response to strain, with changes in structural properties similar to those of hydrophobic domain h at lower strains and to those of cross-linking domain x at higher strains underlying the decoupling of mechanical properties of h and x domains. Together, these findings support a simple elastic network model attributing elastin's extensibility and elastic recoil to the properties of HDs, while CLDs contribute to its structural integrity. The single domain h undergoes significant stress relaxation characterized by structural rearrangements toward a more homogeneous and disordered conformational ensemble. This relaxation from its extended state is predominantly driven by conformational entropy. Ultimately, this knowledge will help in understanding elastin's remarkable mechanical properties.
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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".