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Independent Determination of Cystine in Keratin Proteins

Received: 27 October 2022    Accepted: 9 November 2022    Published: 29 November 2022
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Abstract

The role of cystine residues in a protein is well recognized, providing the disulfide bonds for the structural integrity of a wide range of proteins. Hence, the determination of cystine in proteins is critical in understanding the structural functionality of proteins. The amino acid analysis (AAA) is a popular method to determine amino acid residue compositions in proteins. In practice, oxidation of or chemical modification to cystine is often performed prior to AAA. However, these pretreatments are indiscriminate towards cystine and cysteine. Hence, it is difficult to distinguish cystine from cysteine in protein AA composition analyses, especially for cystine-rich proteins such as keratin. In this report, we demonstrate that it is possible to determine cystine residues in protein selectively independent from cysteine, using the conventional AAA, without pretreatments. Our experimental results have shown that cystine did not transform into cysteic acid during acid hydrolysis, as has been reported previously. Our results also showed a part of L-cystine transformed to D-cystine. Finally, we applied the same AAA to determine the cystine residue levels in feather and human hair samples successfully and compared those with the results obtained from AAA using the pretreatment by oxidation.

Published in International Journal of Biochemistry, Biophysics & Molecular Biology (Volume 7, Issue 2)
DOI 10.11648/j.ijbbmb.20220702.11
Page(s) 47-54
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2022. Published by Science Publishing Group

Keywords

L-/D-cystine, D-cysteine, L-cysteine, Keratin, Amino Acid Analysis

References
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    John M. Schulze, Ken Tasaki. (2022). Independent Determination of Cystine in Keratin Proteins. International Journal of Biochemistry, Biophysics & Molecular Biology, 7(2), 47-54. https://doi.org/10.11648/j.ijbbmb.20220702.11

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    ACS Style

    John M. Schulze; Ken Tasaki. Independent Determination of Cystine in Keratin Proteins. Int. J. Biochem. Biophys. Mol. Biol. 2022, 7(2), 47-54. doi: 10.11648/j.ijbbmb.20220702.11

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    AMA Style

    John M. Schulze, Ken Tasaki. Independent Determination of Cystine in Keratin Proteins. Int J Biochem Biophys Mol Biol. 2022;7(2):47-54. doi: 10.11648/j.ijbbmb.20220702.11

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  • @article{10.11648/j.ijbbmb.20220702.11,
      author = {John M. Schulze and Ken Tasaki},
      title = {Independent Determination of Cystine in Keratin Proteins},
      journal = {International Journal of Biochemistry, Biophysics & Molecular Biology},
      volume = {7},
      number = {2},
      pages = {47-54},
      doi = {10.11648/j.ijbbmb.20220702.11},
      url = {https://doi.org/10.11648/j.ijbbmb.20220702.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijbbmb.20220702.11},
      abstract = {The role of cystine residues in a protein is well recognized, providing the disulfide bonds for the structural integrity of a wide range of proteins. Hence, the determination of cystine in proteins is critical in understanding the structural functionality of proteins. The amino acid analysis (AAA) is a popular method to determine amino acid residue compositions in proteins. In practice, oxidation of or chemical modification to cystine is often performed prior to AAA. However, these pretreatments are indiscriminate towards cystine and cysteine. Hence, it is difficult to distinguish cystine from cysteine in protein AA composition analyses, especially for cystine-rich proteins such as keratin. In this report, we demonstrate that it is possible to determine cystine residues in protein selectively independent from cysteine, using the conventional AAA, without pretreatments. Our experimental results have shown that cystine did not transform into cysteic acid during acid hydrolysis, as has been reported previously. Our results also showed a part of L-cystine transformed to D-cystine. Finally, we applied the same AAA to determine the cystine residue levels in feather and human hair samples successfully and compared those with the results obtained from AAA using the pretreatment by oxidation.},
     year = {2022}
    }
    

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  • TY  - JOUR
    T1  - Independent Determination of Cystine in Keratin Proteins
    AU  - John M. Schulze
    AU  - Ken Tasaki
    Y1  - 2022/11/29
    PY  - 2022
    N1  - https://doi.org/10.11648/j.ijbbmb.20220702.11
    DO  - 10.11648/j.ijbbmb.20220702.11
    T2  - International Journal of Biochemistry, Biophysics & Molecular Biology
    JF  - International Journal of Biochemistry, Biophysics & Molecular Biology
    JO  - International Journal of Biochemistry, Biophysics & Molecular Biology
    SP  - 47
    EP  - 54
    PB  - Science Publishing Group
    SN  - 2575-5862
    UR  - https://doi.org/10.11648/j.ijbbmb.20220702.11
    AB  - The role of cystine residues in a protein is well recognized, providing the disulfide bonds for the structural integrity of a wide range of proteins. Hence, the determination of cystine in proteins is critical in understanding the structural functionality of proteins. The amino acid analysis (AAA) is a popular method to determine amino acid residue compositions in proteins. In practice, oxidation of or chemical modification to cystine is often performed prior to AAA. However, these pretreatments are indiscriminate towards cystine and cysteine. Hence, it is difficult to distinguish cystine from cysteine in protein AA composition analyses, especially for cystine-rich proteins such as keratin. In this report, we demonstrate that it is possible to determine cystine residues in protein selectively independent from cysteine, using the conventional AAA, without pretreatments. Our experimental results have shown that cystine did not transform into cysteic acid during acid hydrolysis, as has been reported previously. Our results also showed a part of L-cystine transformed to D-cystine. Finally, we applied the same AAA to determine the cystine residue levels in feather and human hair samples successfully and compared those with the results obtained from AAA using the pretreatment by oxidation.
    VL  - 7
    IS  - 2
    ER  - 

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Author Information
  • Molecular Structure Laboratory, University of California, Davis, U.S.A

  • Division of Upcycling, Tomorrow Water, Anaheim, U.S.A

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