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Sequence of human beta 2-microglobulin: a correction.

K C Parker, J L Strominger

    Molecular Immunology
    |March 1, 1982
    PubMed
    Summary
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    Researchers corrected the human beta 2-microglobulin (beta 2m) sequence. Automated analysis revealed an extra serine residue, establishing the correct 99-residue length for human beta 2m.

    Area of Science:

    • Biochemistry
    • Proteomics
    • Molecular Biology

    Background:

    • Beta 2-microglobulin (beta 2m) is a crucial protein component of MHC class I molecules.
    • Previous sequence data for human beta 2m has been widely accepted but requires verification.

    Purpose of the Study:

    • To re-evaluate and confirm the accurate amino acid sequence of human beta 2-microglobulin.
    • To identify and correct any discrepancies in the established human beta 2m sequence.

    Main Methods:

    • Isolation of a tryptic peptide from human urinary beta 2m.
    • Automated Edman degradation for peptide sequencing.
    • Comparison of experimental sequence data with published human beta 2m sequence.

    Main Results:

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    • A tryptic peptide's composition did not match the published human beta 2m sequence.
    • Automated sequence analysis identified an erroneous additional serine residue at position 67.
    • The corrected human beta 2m sequence comprises 99 residues, consistent with rabbit and mouse homologues.

    Conclusions:

    • The published sequence of human beta 2m contains an error.
    • The accurate length of human beta 2m is 99 amino acids.
    • This correction refines our understanding of human beta 2m structure and function.