The Function of Different Subunits of the Molecular Chaperone CCT in the Microsporidium : NbCCTζ Interacts with NbCCTα.

Chaperonin containing tailless complex polypeptide 1 (CCT) is a molecular chaperone protein that consists of eight completely different subunits and assists in the folding of newly synthesized peptides. The zeta subunit of CCT is a regulatory factor for the folding and assembly of cytoskeletal proteins as individuals or complexes. In this study, the zeta subunit of (NbCCTζ) is identified for the first time. The complete ORF of the gene is 1533 bp in length and encodes a 510 amino acid polypeptide. IFA results indicate that NbCCTζ is colocalized with actin and β-tubulin in the cytoplasm during the proliferative phase and that NbCCTζ is completely colocalized with NbCCTα in the cytoplasm of throughout the entire life cycle. Furthermore, the yeast two-hybrid assay revealed that the NbCCTζ interacts with NbCCTα. The transcriptional level of is significantly downregulated by knocking down the gene, while the transcriptional level of is downregulated after knocking down the gene. These results suggest that NbCCTζ may play a vital role in the proliferation of by coordinating with NbCCTα.