Separation and purification of Escherichia coli-expressed human thymosin-α1 using affinity chromatography and high-performance liquid chromatography.
Zhang. Hong-Ying HY; Chen. Pei-Fu PF; Xu. Jia-Ming JM; Dai. Quan-Min QM; Xu. Feng F; Han. Qing-Wang QW; Wang. Jian-Jun JJ; Jin. Hei-Ying HY
Key Findings
- Human thymosin‑alpha‑1 can be over‑expressed in E. coli as a soluble hexahistidine‑tagged protein, representing about 50‑60% of total cellular protein.
- A three‑step purification (thermal denaturation, nickel‑affinity chromatography, then HPLC) consistently yields >99% pure peptide.
- The purified peptide has an isoelectric point around 4.0 and shows optimal UV absorbance near 214 nm.
Practical Outcomes
- This protocol gives DIY biohackers a concrete method to produce high‑purity thymosin‑alpha‑1 if they have access to basic molecular biology tools and HPLC equipment. It doesn’t provide dosing or efficacy data, so it’s useful mainly for peptide production rather than direct health guidance.
Summary
Scientists figured out a reliable way to make and purify the peptide thymosin‑alpha‑1 using bacteria, a simple heat step, nickel‑affinity resin, and HPLC, ending up with more than 99% pure product.
Abstract
In this study, a human thymosin-α1 (hTα1) fusion protein was overexpressed in Escherichia coli (E. coli). The hexahistidine-tagged hTα1 fusion protein was obtained in soluble form in cells of the engineered E. coli strain BL21 (DE3)/pET-28a-hTα1 that had been induced with isopropyl -D-1-thiogalactopyranoside (IPTG). The recombinant protein accounted for approximately 50-60% of the total protein. We then developed and validated a separation method for hTα1 from E. coli cells based on thermal denaturation, nickel-resin affinity chromatography and high-performance liquid chromatography. The purification method showed good reproducibility and was easy to operate. Purified recombinant hTα1 of high homogeneity was characterized and found to be of high purity (over 99%), as determined by high-voltage electrophoresis and high-performance liquid chromatography analysis. Isoelectric focusing analysis indicated a pI of approximately 4.0, and full wavelength screening showed an optimal absorbance wavelength at around 214nm.
Study Information
pubmed
2011
2011-01-21T00:00:00.000Z
10.1016/j.pep.2011.01.004
5
14