PEX5R (also called TRIP8b, tetratricopetide repeat-containing Rab8b-interacting protein) is a cytoplasmic protein expressed as a family of alternatively spliced isoforms. PEX5R /TRIP8b isoforms contain a large constant domain preceded by a variable region. The C-terminal half of TRIP8b comprises a tetratricopeptide repeat (TPR) protein binding domain1. Analysis of the Pex5p-like protein revealed the presence of a tetratricopeptide repeat (TPR) domain in its C-terminal half consisting of seven TPR motifs. Pex5R is almost exclusively expressed in brain
