Fibronectin type-III domains: extracellular recognition and signaling interfaces
🧪 lmctl-orchestrated review — written by an orchestrated team of AI agents, grounded in 2,184 papers from lmmol's literature graph. Citations link to their source on PubMed.
| Protein | Papers |
|---|---|
| Fibronectin | 82 |
| Interleukin-6 receptor subunit beta | 50 |
| Neural cell adhesion molecule L1 | 50 |
| Collagen alpha-1(VII) chain | 47 |
| Usherin | 46 |
| Ephrin type-A receptor 2 | 44 |
| Sortilin-related receptor | 44 |
| Myosin light chain kinase, smooth muscle | 42 |
Fibronectin type-III (FN3) repeats are not passive adhesion fragments; in modern mammalian and developmental biology they are treated as context-switch modules that tune receptor geometry, matrix engagement, and signal propagation [1][2]. Their modularity makes them central in receptor biology across cytokine, growth factor, and neural systems rather than a single pathway [3][4]. Across the broader FN3-family, this domain geometry supports dynamic allostery, where local sequence variation translates into distinct binding and clustering behavior [5][6].
1. Structural and signaling themes in current work
Recent papers increasingly describe FN3 domains as scaffolding elements that integrate extracellular matrix cues with intracellular kinase and phosphatase circuits [7][8][9]. This shifts interpretation from one-domain annotations to interaction-layer specificity: similar domain counts can encode very different physiological wiring, and this is exactly why family-level co-citation can over-rank generic adhesion hubs [1][5]. In immune and vascular systems, FN3-containing receptors now frame signal bias through receptor density and dimerization states, not only ligand affinity [10][11].
2. What to read first (and why)
A useful starting paper set emphasizes how FN3 repeats partition signaling in long-lived tissues and receptor clusters under metabolic stress [12][6]. The practical message is that FN3 biology is often about “architecture-for-information-flow”: the domain arranges who talks to whom, and that interface then defines downstream output [4][12]. Follow-on studies now link FN3-centered receptor context to tissue patterning and disease-associated signaling resilience [11][11].
3. Practical orientation for lmmol
For review exploration, prioritize papers that connect FN3 architecture to measurable pathway shifts, and avoid over-emphasizing methods-only citation islands [10][5]. In this topic, compare key proteins that are repeatedly cited as central to context-setting versus those high in network degree but broader in function [1][3].
- Fibronectin
- Interleukin-6 receptor subunit beta
- Neural cell adhesion molecule L1
- Collagen alpha-1(VII) chain
- Usherin
- Ephrin type-A receptor 2
- Sortilin-related receptor
- Myosin light chain kinase, smooth muscle
References
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