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Purification and characterization of recombinant human activin B
C H Schmelzer1, L E Burton, C M Tamony
1Genentech, Inc., Recovery Process R&D, South San Francisco, CA 94080.
Biochimica Et Biophysica Acta
|June 19, 1990
Summary
Recombinant human activin B, a protein crucial for biological processes, was successfully purified to over 95% from kidney cells. Its dimeric structure and biochemical properties were characterized, confirming its identity as derived from the inhibin B beta subunit.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Chemistry
Background:
- Activin B is a member of the TGF-beta superfamily, involved in various physiological processes.
- Understanding the biochemical properties of recombinant activin B is essential for its therapeutic and research applications.
Purpose of the Study:
- To isolate and purify recombinant human activin B from a mammalian kidney cell line.
- To characterize the biochemical and biophysical properties of the purified activin B.
Main Methods:
- Isolation and purification of recombinant human activin B.
- Sodium dodecyl sulfate-polyacrylamide-gel electrophoresis (SDS-PAGE) to determine molecular mass.
- Gel filtration chromatography to assess molecular size.
- Amino-terminal sequencing and amino acid composition analysis.
- Isoelectric focusing and chromatofocusing to determine isoelectric point (pI).
Main Results:
- Recombinant human activin B was purified to >95% purity.
- It exists as a covalently-linked homodimer with specific molecular masses under reduced and unreduced conditions.
- Biochemical analyses confirmed the protein's identity and properties, including its amino-terminal sequence, amino acid composition, and isoelectric point.
Conclusions:
- The study successfully produced and characterized high-purity recombinant human activin B.
- The findings validate the recombinant protein's identity and provide essential data for its future use in biological research and potential therapeutic development.