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Updated: Jul 19, 2026

Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli
Published on: August 3, 2017
Purification and structural characterization of human ERp29.
Jinbiao Zheng1, Xingang Liu, Xiaomin Yan
1Center of Analysis and Measurement, Fudan University, Shanghai 200433, PR China.
Human endoplasmic reticulum protein 29 (ERp29) has significant alpha-helical structure and is stable below 50°C. Temperature changes reveal two structural transitions, potentially explaining its limited ability to prevent protein aggregation.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Endoplasmic reticulum protein 29 (ERp29) is a key molecular chaperone in animal cells.
- Its precise role in cellular processes, particularly under thermal stress, requires further elucidation.
Purpose of the Study:
- To characterize the secondary structure and thermal stability of human ERp29.
- To investigate temperature-induced conformational changes in ERp29.
Main Methods:
- Bacterial expression system for protein isolation.
- Circular dichroism (CD) spectroscopy.
- Fourier-transform infrared (FTIR) spectroscopy.
- Raman spectroscopy.
Main Results:
- Human ERp29 was successfully isolated and purified.
- Spectroscopic analysis confirmed a significant alpha-helical content in ERp29's secondary structure.
- CD and FTIR revealed that ERp29 is stable below 50°C, with two distinct structural transitions occurring between 50°C and 70°C.
Conclusions:
- Human ERp29 possesses substantial alpha-helical structure.
- The observed thermal transitions suggest a limited capacity to protect substrate proteins from thermal aggregation.
- These findings provide insights into ERp29's functional limitations under heat stress.
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