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. 1995 Oct 1;311(Pt 1):133–137. doi: 10.1042/bj3110133

The refolding of hen egg white riboflavin-binding protein: effect of protein disulphide isomerase on the reoxidation of the reduced protein.

D A McClelland 1, S H McLaughlin 1, R B Freedman 1, N C Price 1
PMCID: PMC1136129  PMID: 7575444

Abstract

Hen egg white riboflavin-binding protein (RfBP) contains nine disulphide bonds. Provided these remain intact, the refolding of RfBP after incubation in 6 M guanidinium chloride is highly efficient with at least 95% of the binding activity regained within 3 min. Kinetic studies indicate that this regain consists of at least two phases. When the disulphide bonds of RfBP are reduced, reoxidation using a mixture of oxidized and reduced glutathione leads to less than 5% recovery of activity. However, if protein disulphide isomerase (PDI; EC 5.3.4.1) is present during the reoxidation nearly 50% activity can be regained, suggesting that PDI may play an important role in the maturation of RfBP in vivo.

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Selected References

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