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TitleUnveiling the stochastic nature of human heteropolymer ferritin self-assembly mechanism.
Journal, issue, pagesProtein Sci, Vol. 33, Issue 8, Page e5104, Year 2024
Publish dateJul 12, 2024
AuthorsFadi Bou-Abdallah / Jeremie Fish / Genki Terashi / Yuanyuan Zhang / Daisuke Kihara / Paolo Arosio /
PubMed AbstractDespite ferritin's critical role in regulating cellular and systemic iron levels, our understanding of the structure and assembly mechanism of isoferritins, discovered over eight decades ago, remains ...Despite ferritin's critical role in regulating cellular and systemic iron levels, our understanding of the structure and assembly mechanism of isoferritins, discovered over eight decades ago, remains limited. Unveiling how the composition and molecular architecture of hetero-oligomeric ferritins confer distinct functionality to isoferritins is essential to understanding how the structural intricacies of H and L subunits influence their interactions with cellular machinery. In this study, ferritin heteropolymers with specific H to L subunit ratios were synthesized using a uniquely engineered plasmid design, followed by high-resolution cryo-electron microscopy analysis and deep learning-based amino acid modeling. Our structural examination revealed unique architectural features during the self-assembly mechanism of heteropolymer ferritins and demonstrated a significant preference for H-L heterodimer formation over H-H or L-L homodimers. Unexpectedly, while dimers seem essential building blocks in the protein self-assembly process, the overall mechanism of ferritin self-assembly is observed to proceed randomly through diverse pathways. The physiological significance of these findings is discussed including how ferritin microheterogeneity could represent a tissue-specific adaptation process that imparts distinctive tissue-specific functions to isoferritins.
External linksProtein Sci / PubMed:38995055 / PubMed Central
MethodsEM (single particle)
Resolution2.9 Å
Structure data

EMDB-44400: L-rich (38%H:62%L) human heteropolymeric ferritin
Method: EM (single particle) / Resolution: 2.9 Å

Source
  • Homo sapiens (human)

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