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Solid phase synthesis of thymosin beta 9.

N Chandramouli, K K Bhargava, G S Incefy

    International Journal of Peptide and Protein Research
    |November 1, 1986
    PubMed
    Summary
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    Synthesized thymosin beta 9 peptide exhibits significant terminal deoxynucleotidyl transferase activity, comparable to thymosin beta 4. However, it lacks the rosette inhibition activity seen with thymosin alpha 1.

    Area of Science:

    • Biochemistry
    • Immunology
    • Peptide Synthesis

    Background:

    • Thymosin peptides are crucial for immune system development.
    • Thymosin beta 4 and alpha 1 have known biological activities.
    • The specific functions of thymosin beta 9 require further investigation.

    Purpose of the Study:

    • To synthesize thymosin beta 9 using solid-phase peptide synthesis.
    • To evaluate the enzymatic activity of synthesized thymosin beta 9.
    • To compare the biological activity of thymosin beta 9 with other thymosins.

    Main Methods:

    • Solid-phase peptide synthesis with modified low HF deprotection and cleavage.
    • Analytical purification yielding pure thymosin beta 9.
    • Terminal deoxynucleotidyl transferase (TdT) assay.

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  • Rosette inhibition assay.

    • Main Results:

    • Thymosin beta 9 was successfully synthesized and purified in 32% yield.
    • Thymosin beta 9 showed higher TdT activity than calf thymus fraction 5.
    • Thymosin beta 9's TdT activity was comparable to thymosin beta 4.
    • Neither thymosin beta 9 nor beta 4 demonstrated activity in the rosette inhibition assay, unlike thymosin alpha 1.

    Conclusions:

    • Solid-phase synthesis is an effective method for producing thymosin beta 9.
    • Thymosin beta 9 possesses TdT-modulating activity.
    • Thymosin beta 9 and beta 4 may have distinct immunological roles compared to thymosin alpha 1, particularly concerning T-cell mediated responses.