TTC32 contains 3 TPR repeats. The tetratricopeptide repeat （TPR） is a structural motif. TPR is observed in organized 3–16 motifs， which form scaffolds to mediate protein–protein interactions and frequently the assembly of multiprotein complexes. TPR-containing proteins include the anaphase-promoting complex subunits cdc16， cdc23 and cdc27， the NADPH oxidase subunit p67-phox， hsp90-binding immunophilins， transcription factors， the major receptor for peroxisomal matrix protein import PEX5， the PKR protein kinase inhibitor and mitochondrial import proteins.
