TB-500 is a synthetic peptide fragment derived from Thymosin Beta-4, studied in laboratory research focused on cellular signaling, tissue biology, and repair pathways.
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TB-500 Product Overview TB-500 is a synthetic, N-terminally acetylated heptapeptide with the sequence Ac-LKKTETQ. It corresponds to amino-acid residues 17–23 of human thymosin beta-4 and contains a central actin-binding region associated with the parent peptide. Each vial contains 10mg of lyophilized TB-500 intended for controlled laboratory investigation of peptide identity, actin-related interactions, cellular migration and peptide metabolism. Product Specifications Product name: TB-500 Alternative name: Thymosin Beta-4 Fragment 17–23 Quantity per vial: 10mg Peptide length: 7 amino acids Sequence: Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln-OH Abbreviated sequence: Ac-LKKTETQ-OH Commonly referenced CAS number: 885340-08-9 Reference molecular formula: C38H68N10O14 Reference molecular weight: 889.0 g/mol Format: Lyophilized material Container: Single vial Structural Background Full-length thymosin beta-4 is a 43-amino-acid peptide involved in intracellular actin regulation. TB-500 represents only the acetylated 17–23 region of that larger molecule. The LKKTETQ sequence has been investigated as an actin-binding region of thymosin beta-4. N-terminal acetylation distinguishes TB-500 from the corresponding unmodified LKKTETQ sequence and may affect stability and metabolic processing. TB-500 and Full-Length Thymosin Beta-4 TB-500 and full-length thymosin beta-4 are not chemically identical or interchangeable. TB-500 contains 7 amino acids and has a reference molecular weight of approximately 889 Da. Full-length thymosin beta-4 contains 43 amino acids and has a molecular weight of approximately 4,963 Da. This distinction is important because many studies frequently cited on commercial TB-500 pages actually investigated full-length thymosin beta-4 rather than the isolated Ac-LKKTETQ fragment. Findings involving the complete parent peptide should not automatically be attributed to TB-500. Scientific Background Published research has chemically identified TB-500 using chromatography and high-resolution mass spectrometry. Additional studies have examined its metabolic cleavage products and analytical detection in biological research samples. Research involving the LKKTETQ region and full-length thymosin beta-4 has examined actin binding, cellular migration and endothelial-response models. However, evidence relating specifically to the acetylated TB-500 fragment remains more limited than the scientific literature concerning full-length thymosin beta-4. References to tissue repair, angiogenesis, inflammation or wound healing on other websites frequently originate from research involving the full-length parent peptide. These findings do not establish equivalent activity for this shorter fragment and should not be presented as proven effects of TB-500. Potential Research Areas Mass-spectrometry identity confirmation HPLC purity analysis Peptide stability and degradation Metabolite identification and profiling Actin-binding motif studies Cell-migration assays Endothelial-response models Comparison with unmodified LKKTETQ Comparison with full-length thymosin beta-4 Analytical Considerations Researchers should review the Certificate of Analysis associated with the specific product batch. The expected mass-spectrometry result should correspond to the molecular identity of the seven-amino-acid Ac-LKKTETQ fragment. A measured mass near 889 Da supports identification of the fragment. A result near 4,963 Da instead indicates full-length thymosin beta-4. These materials should not be grouped under the same analytical specification. HPLC purity, mass-spectrometry identity and total vial quantity are different measurements. A high purity result does not independently confirm that the vial contains the stated 10mg quantity. The salt form and counterion should also be confirmed through batch-specific documentation because acetate and trifluoroacetate forms can produce different reported molecular formulas and total masses. Storage Store the unopened vial according to the conditions stated on the product label and batch-specific documentation. Keep the material sealed and protected from light, heat and moisture. Storage instructions published for full-length thymosin beta-4 or another supplier’s formulation should not be assumed to apply to this product. For laboratory research only. Not for human consumption or veterinary use. This product is not a drug, medication, supplement or cosmetic and is not intended to diagnose, treat, cure or prevent any disease. No dosing, administration or reconstitution instructions are provided.
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