Covalent structure of human haptoglobin

A serine protease homolog

A. Kurosky, D. R. Barnett, T. H. Lee, B. Touchstone, R. E. Hay, M. S. Arnott, B. H. Bowman, W. M. Fitch

    Research output: Contribution to journalArticle

    190 Citations (Scopus)

    Abstract

    The complete amino acid sequences and the disulfide arrangements of the two chains of human haptoglobin 1-1 were established. The α 1 and β chains of haptoglobin contain 83 and 245 residues, respectively. Comparison of the primary structure of haptoglobin with that of the chymotrypsinogen family of serine proteases revealed a significant degree of chemical similarity. The probability was less than 10 -5 that the chemical similarity of the β chain of haptoglobin to the proteases was due to chance. The amino acid sequence of the β chain of haptoglobin is 29-33% identical to bovine trypsin, bovine chymotrypsin, porcine elastase, human thrombin, or human plasmin. Comparison of haptoglobin α 1 chain to activation peptide regions of the zymogens revealed an identity of 25% to the fifth 'kringle' region of the activation peptide of plasminogen. The probability was less than 0.014 that this similarity was due to chance. These results strongly indicate haptoglobin to be a homolog of the chymotrypsinogen family of serine proteases. Alignment of the β-chain sequence of haptoglobin to the serine proteases is remarkably consistent except for an insertion of 16 residues in the region corresponding to the methionyl loop of the serine proteases. The active-site residues typical of the serine proteases, histidine-57 and serine-195, are replaced in haptoglobin by lysine and alanine, respectively; however, aspartic acid-102 and the trypsin specificity residue, aspartic acid-189, do occur in haptoglobin. Haptoglobin and the serine proteases represent a striking example of homologous proteins with different biological functions.

    Original languageEnglish (US)
    Pages (from-to)3388-3392
    Number of pages5
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume77
    Issue number6 I
    DOIs
    StatePublished - 1980

    Fingerprint

    Haptoglobins
    Serine Proteases
    Chymotrypsinogen
    Aspartic Acid
    Amino Acid Sequence
    human HP protein
    Kringles
    Peptides
    Enzyme Precursors
    Sequence Alignment
    Pancreatic Elastase
    Plasminogen
    Fibrinolysin
    Histidine
    Thrombin
    Disulfides
    Alanine
    Trypsin
    Serine
    Lysine

    ASJC Scopus subject areas

    • Genetics
    • General

    Cite this

    Kurosky, A., Barnett, D. R., Lee, T. H., Touchstone, B., Hay, R. E., Arnott, M. S., ... Fitch, W. M. (1980). Covalent structure of human haptoglobin: A serine protease homolog. Proceedings of the National Academy of Sciences of the United States of America, 77(6 I), 3388-3392. https://doi.org/10.1073/pnas.77.6.3388

    Covalent structure of human haptoglobin : A serine protease homolog. / Kurosky, A.; Barnett, D. R.; Lee, T. H.; Touchstone, B.; Hay, R. E.; Arnott, M. S.; Bowman, B. H.; Fitch, W. M.

    In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 77, No. 6 I, 1980, p. 3388-3392.

    Research output: Contribution to journalArticle

    Kurosky, A, Barnett, DR, Lee, TH, Touchstone, B, Hay, RE, Arnott, MS, Bowman, BH & Fitch, WM 1980, 'Covalent structure of human haptoglobin: A serine protease homolog', Proceedings of the National Academy of Sciences of the United States of America, vol. 77, no. 6 I, pp. 3388-3392. https://doi.org/10.1073/pnas.77.6.3388
    Kurosky, A. ; Barnett, D. R. ; Lee, T. H. ; Touchstone, B. ; Hay, R. E. ; Arnott, M. S. ; Bowman, B. H. ; Fitch, W. M. / Covalent structure of human haptoglobin : A serine protease homolog. In: Proceedings of the National Academy of Sciences of the United States of America. 1980 ; Vol. 77, No. 6 I. pp. 3388-3392.
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    AB - The complete amino acid sequences and the disulfide arrangements of the two chains of human haptoglobin 1-1 were established. The α 1 and β chains of haptoglobin contain 83 and 245 residues, respectively. Comparison of the primary structure of haptoglobin with that of the chymotrypsinogen family of serine proteases revealed a significant degree of chemical similarity. The probability was less than 10 -5 that the chemical similarity of the β chain of haptoglobin to the proteases was due to chance. The amino acid sequence of the β chain of haptoglobin is 29-33% identical to bovine trypsin, bovine chymotrypsin, porcine elastase, human thrombin, or human plasmin. Comparison of haptoglobin α 1 chain to activation peptide regions of the zymogens revealed an identity of 25% to the fifth 'kringle' region of the activation peptide of plasminogen. The probability was less than 0.014 that this similarity was due to chance. These results strongly indicate haptoglobin to be a homolog of the chymotrypsinogen family of serine proteases. Alignment of the β-chain sequence of haptoglobin to the serine proteases is remarkably consistent except for an insertion of 16 residues in the region corresponding to the methionyl loop of the serine proteases. The active-site residues typical of the serine proteases, histidine-57 and serine-195, are replaced in haptoglobin by lysine and alanine, respectively; however, aspartic acid-102 and the trypsin specificity residue, aspartic acid-189, do occur in haptoglobin. Haptoglobin and the serine proteases represent a striking example of homologous proteins with different biological functions.

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