Validates GO enrichment in human proteins, indicating key structural families.
GO enrichment validation (g:Profiler, FDR<0.05) of the Genesis Human Proteome Scan. Three candidate groups analyzed: Allosteric top-1% (n=203, allo_score>=-7.60), Fiedler top-1% (n=202, spectral_gap>=0.122), Borderline (n=37, drug_score 0.46-0.70). Enrichment yields 176, 164, 97 significant terms respectively. KEY FINDING: Fiedler top-1% reveals two structurally distinct families sharing extreme two-module topology: (1) TCR variable regions (n=44, TRAV/TRBV/TRGV) — Ig V-domain beta-sheet sandwich — yielding GO:CC T cell receptor complex p=6.4e-52, adaptive immune response p=1.9e-26; (2) Metallothionein family (n=13) — alpha/beta cluster architecture — REAC Metallothioneins bind metals p=1.1e-16. MTRNR2L/Humanin-like peptides (n=18) form a third structural group. Allosteric group dominated by metal-stress pathways (p<4e-18). Borderline group pinpoints zinc homeostasis/DYNLL1/CYCS/TXN. Conclusion: Markov-Fiedler spectral gap is a validated structural symmetry detector, not an artifact.
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Yao-Kai Kao (2026) studied this question.
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