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Related Experiment Videos

Model for mammalian metallothionein structure.

Y Boulanger, C M Goodman, C P Forte

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    Mammalian metallothioneins feature homologous structures with 20 cysteines binding 7 metal ions. A two-domain model, supported by NMR, reveals distinct metal clusters and cysteine involvement in protein structure.

    Area of Science:

    • Biochemistry
    • Structural Biology
    • Proteomics

    Background:

    • Metallothioneins (MTs) are cysteine-rich proteins involved in metal homeostasis and detoxification.
    • Understanding MT structure is crucial for elucidating their biological functions.
    • Mammalian MTs exhibit high primary sequence homology, suggesting conserved structural features.

    Purpose of the Study:

    • To propose a detailed molecular model for mammalian metallothioneins based on physicochemical data.
    • To elucidate the metal-binding sites and structural organization of MTs.
    • To correlate structural findings with genetic information, such as gene intron positions.

    Main Methods:

    • Physicochemical studies including UV and Circular Dichroism (CD) spectroscopy.
    • Theoretical analysis using the Chou-Fasman method for secondary structure prediction.

    Related Experiment Videos

  • Nuclear Magnetic Resonance (NMR) spectroscopy, specifically 113Cd NMR and 1H NMR at 500 MHz.
  • Enzymatic cleavage of MT fragments for site-specific structural analysis.

    • Main Results:

    • All 20 cysteine residues are involved in ligating 7 metal ions per MT molecule.
    • MTs lack alpha-helix structures but contain 11 beta-bends, each involving cysteine.
    • 113Cd NMR reveals two distinct metal clusters: a 4-metal cluster and a 3-metal cluster, with tetrahedral coordination.
    • The carboxyl-terminal domain (residues 30-61) binds the 4-metal cluster, while the amino-terminal domain (residues 1-29) binds the 3-metal cluster.
    • The observed domain division aligns with the intron position in the mouse MT-1 gene.

    Conclusions:

    • A two-domain molecular model for mammalian metallothioneins is proposed, supported by extensive spectroscopic and theoretical data.
    • The model accurately describes the arrangement of metal ions and cysteine residues within distinct structural domains.
    • The findings provide a structural basis for understanding MT function and evolution, linking protein structure to gene organization.