PDIa family, endoplasmic reticulum protein 29 (ERp29) subfamily; ERp29 is a ubiquitous ER-resident protein expressed in high levels in secretory cells. It forms homodimers and higher oligomers in vitro and in vivo. It contains a redox inactive TRX-like domain at the N-terminus, which is homologous to the redox active TRX (a) domains of PDI, and a C-terminal helical domain similar to the C-terminal domain of P5. The expression profile of ERp29 suggests a role in secretory protein production distinct from that of PDI. It has also been identified as a member of the thyroglobulin folding complex. The Drosophila homolog, Wind, is the product of windbeutel, an essential gene in the development of dorsal-ventral patterning. Wind is required for correct targeting of Pipe, a Golgi-resident type II transmembrane protein with homology to 2-O-sulfotransferase.
Jiyao W et al.(2023). "The conserved domain database in 2023.",