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Purification and Structural Characterization of Human ERp29

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ERp29 is a major resident of the endoplasmic reticulum (ER) and is postulated to play an important molecular chaperone role in most animal cells. Human ERp29 was isolated to homogeneity in high yield by using a bacterial expression system. Its secondary structure was studied by circular dichroism (CD), Fourier transformed infrared spectroscopy (FTIR) and Raman spectroscopy and it was found that human ERp29 comprises significant _-helical structure. The details of its temperature-induced conformational changes was studied by CD and FTIR for the first time, revealing that the protein is stable below 50 °C and has two distinct structural transitions between 50 °C and 70 °C. This may shed light on ERp29's inability to protect substrate proteins against thermal aggregation.

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Keywords: CD; FTIR; Human ERp29; Raman spectroscopy; secondary structure

Document Type: Research Article

Affiliations: Center of Analysis and Measurement, Fudan University, Shanghai 200433, P.R. China.

Publication date: 2006-08-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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