What they found
Integrated seed-based framework design with ribosome display to generate novel nanobody-like protein scaffolds. Four conserved 10-residue seed frameworks were embedded in random sequences creating a library >10^13 variants. Iterative ribosome display selection plus AlphaFold 3 structural prediction identified candidates with canonical nanobody-like folds. Two candidates demonstrated stable expression with thermal stability ~63.2C, validating that minimal conserved “seed” sequences can nucleate correct protein folding even in randomized contexts.
Lateral connection
The seed-based design principle — keeping minimal conserved framework residues while randomizing the rest — is conceptually the inverse of our mini-STRC truncation approach. For mini-STRC, we’re removing internal domains while keeping flanking regions. The question is: what are the minimal “seed” sequences in stereocilin that must be preserved for correct folding and function? This paper’s methodology of identifying conserved seed frameworks through sequence alignment across homologs could be applied to stereocilin to identify the irreducible core sequences. AlphaFold 3 validation of fold predictions further supports our computational approach to evaluating truncation designs.
Hypothesis suggested
Stereocilin contains conserved “seed framework” residues that are necessary and sufficient for correct extracellular folding. These seed residues define the minimum viable truncation boundaries for mini-STRC. AlphaFold 3-guided identification of these seeds could produce a smaller, more stable mini-STRC than the current truncation 700-1775 design.
What could be computed
Multiple sequence alignment of stereocilin orthologs across species to identify conserved framework residues. Map these onto the AlphaFold-predicted structure. Test whether removing non-conserved regions while preserving framework residues yields stable predicted folds. Compare predicted stability of seed-based mini-STRC designs vs. the current contiguous truncation.
Links
Connections
[source]auto-indexed 2026-04-20 by strc-lit-watch