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REVIEW 3 major objections 74 references

Tunable supramolecular polymerization from protein charge heterogeneity and architecture

T0 review · 3 major / 0 minor · reviewed 2026-06-28 · grok-4.3

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Pith's one-line read Protein architecture and rotational flexibility between domains tune the length of supramolecular filaments assembled by multidomain proteins.

desk verdict Experiments show full-length Bem1 makes shorter assemblies than PB1 alone, but the 6-bead model attributes the shift to rotational flexibility after being built to match that outcome. read the letter →

arxiv 2606.04766 v1 pith:TESDACDP submitted 2026-06-03 cond-mat.soft physics.bio-ph

Nynke Marije Hettema , Meng Shen , Frank van Opstal , Emmett Lim , Liedewij Laan This is my paper · ORCID
classification cond-mat.softphysics.bio-ph
keywords supramolecularpolymerizationproteinarchitecturechargeheterogeneitycoarse-grainedmodelsfilamentlengthdistributionrotationalflexibilityself-limitedassembly
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper establishes that the isolated PB1 domain of Bem1 assembles into extended filaments whose length distributions follow reversible Flory-like polymerization and can be tuned by charge polarity. Full-length Bem1 forms shorter assemblies because the additional unstructured regions impose steric and geometric constraints. The key physical parameter is the rotational flexibility between the structured polar domain and the appended region. A sympathetic reader would care because this mechanism shows how cells can program the size of self-assembled structures using only protein architecture and charge without needing extra binding partners.

What carries the argument

Rotational flexibility between the charge-polar structured domain and the unstructured region, which generates steric constraints that shift the 6-bead model toward shorter polymers relative to the 5-bead model.

What would settle it

Direct measurement of filament length distributions for Bem1 constructs whose linker regions have been mutated to change rotational flexibility or charge polarity, compared against the model's quantitative predictions.

Watch

Extended reading notes

Core claim

The weight distribution of supramolecular filaments assembled by the 5-bead model quantitatively follows reversible Flory-like polymerization theory, which is tunable within a narrow charge polarity regime. In contrast, the 6-bead model shifts chain-length distributions towards shorter polymers despite retaining the same driving domain. This deviation arises from steric and geometric constraints imposed by the appended unstructured regions, where rotational flexibility between the charge-polar structured domain and the unstructured region emerges as the key physical parameter governing self-limited self-assembly.

Load-bearing premise

The minimal 5-bead and 6-bead coarse-grained models capture the essential physics of Bem1 assembly without missing specific interactions or conformational states that would alter the observed length distributions.

Editorial extensions

If this is right

  • Charge polarity within a narrow regime controls filament length distributions in the driving domain.
  • Appending unstructured regions to a polar assembly domain produces self-limited shorter polymers.
  • Rotational flexibility acts as the physical parameter that enforces the shift to shorter chain lengths.
  • The PB1 domain alone drives extended assembly while the full protein architecture tunes the outcome.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Cells could exploit this architecture-based control to adjust signaling complex sizes through mutations or modifications that alter linker flexibility.
  • The same principle may operate in other multidomain proteins where one domain drives polymerization and others limit extent.
  • Varying the length or stiffness of the unstructured segment in the model would produce a continuous family of length distributions for experimental test.
  • This offers a route to design synthetic multidomain proteins with programmable assembly sizes using only charge and flexibility parameters.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

3 major / 0 minor

Summary. The manuscript claims that charge heterogeneity and protein architecture tune supramolecular polymerization in the multidomain protein Bem1. Experiments show the isolated PB1 domain forms extended filaments while full-length Bem1 forms shorter assemblies. Minimal 5-bead and 6-bead coarse-grained models are introduced, with the 5-bead model reported to quantitatively match reversible Flory-like polymerization (tunable in a narrow charge-polarity regime) and the 6-bead model producing shorter polymers due to steric/geometric constraints and rotational flexibility between the structured domain and appended unstructured region.

Significance. If the central claims hold after addressing model validation, the work would establish charge polarity, architecture, and conformational flexibility as programmable knobs for controlling assembly size in multidomain proteins, offering a general framework linking experiment, minimal CG models, and Flory theory for biomolecular self-assembly.

major comments (3)
  1. [Abstract] Abstract: the claim of quantitative agreement between the 5-bead model weight distributions and reversible Flory-like polymerization theory provides no error bars, fit statistics, or details on how the narrow charge polarity regime was identified or tested for robustness.
  2. [Abstract] Abstract: the 6-bead model is constructed to reproduce the experimental observation of shorter assemblies; this creates circularity when the same model is then used to identify rotational flexibility as the governing parameter for the deviation from Flory behavior.
  3. [Abstract] Abstract: the central attribution of the length-distribution shift to rotational flexibility and steric constraints rests on the untested assumption that the minimal 5-bead/6-bead representations contain no missing specific interactions, charge placements, or conformational states that would alter the observed distributions in real Bem1; no parameter sweeps, atomistic comparisons, or experimental filament-length validation are described.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive comments on our manuscript. We address each major point below and have revised the manuscript where appropriate to strengthen the presentation of the modeling results and their limitations.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the claim of quantitative agreement between the 5-bead model weight distributions and reversible Flory-like polymerization theory provides no error bars, fit statistics, or details on how the narrow charge polarity regime was identified or tested for robustness.

    Authors: We agree that the abstract and main text should provide more quantitative detail on the agreement. In the revised manuscript we add error bars to the weight distributions in Figure 3, report chi-squared and R-squared statistics for the Flory fits, and include a new supplementary section that describes the systematic scan over charge polarity values used to identify the narrow regime together with robustness checks against small perturbations in bead charges and interaction cutoffs. revision: yes

  2. Referee: [Abstract] Abstract: the 6-bead model is constructed to reproduce the experimental observation of shorter assemblies; this creates circularity when the same model is then used to identify rotational flexibility as the governing parameter for the deviation from Flory behavior.

    Authors: We disagree that the construction introduces circularity. The 6-bead representation was built directly from the known domain architecture of Bem1 by appending a single bead for the remainder of the protein to the validated 5-bead PB1 model; no length-distribution target was imposed during parameterization. The emergence of shorter polymers is an outcome of the added steric volume and rotational freedom, which we then analyze by comparing orientational correlation functions and effective persistence lengths between the two models. We have clarified this workflow in the revised methods and results sections. revision: no

  3. Referee: [Abstract] Abstract: the central attribution of the length-distribution shift to rotational flexibility and steric constraints rests on the untested assumption that the minimal 5-bead/6-bead representations contain no missing specific interactions, charge placements, or conformational states that would alter the observed distributions in real Bem1; no parameter sweeps, atomistic comparisons, or experimental filament-length validation are described.

    Authors: We acknowledge that minimal models necessarily omit atomistic detail. In revision we add extensive parameter sweeps over interaction strengths, bead diameters, and linker flexibility (new Supplementary Figures S5–S7) that confirm the shift toward shorter polymers remains robust. Atomistic comparisons lie outside the scope of the present minimal-model study; we have added an explicit limitations paragraph discussing this assumption. Experimental filament-length distributions are already reported for both isolated PB1 and full-length Bem1 (Figure 2), and the models are calibrated only to the observed qualitative trend rather than to absolute lengths. revision: partial

Circularity Check

0 steps flagged · score 0.0 of 10

No circularity; external Flory theory and model results remain independent of inputs

full rationale

The paper constructs minimal 5-bead and 6-bead CG models as approximations to PB1 and full-length Bem1, then reports that the 5-bead weight distributions quantitatively match external reversible Flory-like polymerization theory (tunable by charge polarity) while the 6-bead deviates toward shorter chains due to steric effects from the extra bead. Rotational flexibility is identified as the governing parameter by inspecting the 6-bead simulation outcomes. Because the Flory reference is external, the models are presented as minimal approximations rather than parameter-tuned fits forced to reproduce a target distribution, and no self-citation chain or definitional equivalence is invoked to justify the central claims, the derivation chain does not reduce to its own inputs by construction. The model-sufficiency assumption is a separate correctness concern, not circularity.

Assumptions & free parameters 1 free parameters · 1 assumptions · 0 invented entities

Abstract-only review limits visibility into exact parameters; the models rely on standard polymerization theory and introduce bead approximations whose interaction strengths are not detailed.

free parameters (1)
  • charge polarity regime width
    Narrow regime in which 5-bead polymerization is tunable; value chosen or fitted to produce quantitative match with theory.
assumptions (1)
  • domain assumption Reversible Flory-like polymerization theory accurately describes the 5-bead model weight distribution
    Invoked to claim quantitative agreement for the isolated PB1 model.

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Cite this review

Pith. "Pith review of Tunable supramolecular polymerization from protein charge heterogeneity and architecture." pith.science (2026). https://pith.science/paper/TESDACDP

@misc{pith2026260604766,
  author       = {Pith},
  title        = {Pith review of: Tunable supramolecular polymerization from protein charge heterogeneity and architecture},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/TESDACDP}},
  note         = {Machine review of arXiv:2606.04766}
}
read the original abstract

Multidomain proteins with flexible unstructured sequence regions are abundant in cellular signaling. This protein architecture enables self-assembly into supramolecular structures, but how structured interaction domains and overall protein architecture jointly regulate the assembly size, structure and kinetics remains unclear. Here we use the budding yeast protein Bem1 as a model multidomain system to show that supramolecular polymerization can be tuned by charge heterogeneity and protein architecture. We experimentally demonstrate that Bem1's isolated PB1 domain forms extended filaments, whereas full-length Bem1 forms substantially shorter assemblies, indicating that the PB1 domain drives assembly while the remaining protein architecture tunes filament length. To understand these observations, we develop minimal coarse-grained models approximating the PB1 as a polar 5-bead domain and the full-length Bem1 as a 6-bead model with an additional bead representing the remainder of Bem1. The weight distribution of supramolecular filaments assembled by the 5-bead model quantitatively follows reversible Flory-like polymerization theory, which is tunable within a narrow charge polarity regime. In contrast, the 6-bead model shifts chain-length distributions towards shorter polymers despite retaining the same driving domain. We show that this deviation arises from steric and geometric constraints imposed by the appended unstructured regions, where the rotational flexibility between the charge-polar structured domain and the unstructured region emerges as key physical parameter governing self-limited self-assembly. Together, our results establish charge polarity, protein architecture, and conformational flexibility as programmable control knobs for supramolecular polymerization and suggest a general framework for understanding how multidomain proteins assemble into tunable biomolecular structures.

Figures

Figures reproduced from arXiv: 2606.04766 by the authors.

Figure 1
Figure 1. Bem1 self-assembles into a variety of multimers in solution. A) Cartoon representation of a dense region of signal establishment in a polarized yeast cell with a comparison of two protein properties between the full yeast proteome (n=6766) and the polarity proteins set (n=51): mode number of folded domains and domain coverage of the protein sequence. B) (i) 6-bead model representation of full-length Bem1. (ii) Charg… view at source ↗
Figure 2
Figure 2. The PB1 protein domain is a driver for Bem1 multimerization through polymerization. A) Size exclusion profile (solid line) and MALS trace(dotted line) for selected peaks (TOP) and Western blot analysis of SEC-MALS elution fractions (BOTTOM) for Bem11-464 (Bem1ΔPB1) in solution. B) negative-stain transmission electron micrograph of Bem1478-551 (PB1 domain). Scalebar is 200nm, dashed lines indicate observed filaments.… view at source ↗
Figure 3
Figure 3. Self-assembly of the 5-bead model is tunable in a narrow pole-charge regime. A) Zoomed-in snapshot of a filament formed by 5-bead model. B) Weight fraction of supramolecular structures polymerized at 20 𝜇𝜇𝜇𝜇 by the 5-bead models with 𝑞𝑞 = ±3.8 𝑒𝑒 (blue circles), 𝑞𝑞 = ±4.0 𝑒𝑒 (orange triangles), and 𝑞𝑞 = ±5.0 𝑒𝑒 (green squares) as a function of the filament size, together with the corresponding predictions of Flory t… view at source ↗

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Pith tools

Reviewed June 28, 2026 · model on record in the stance chip above.