The domain within your query sequence starts at position 275 and ends at position 441; the E-value for the RPT_1 domain shown below is 8.68e-15.

QIEASSRQTEASNRQTEASSRQTEASSRQTETSNRQIGASNRQIMASNRQIGASNRQIEA
SNRQIGASNRQTEVSSRQIEASNRQIGASNRQTEASNRQIGASNRQTEASNRQIGASNRQ
TDASNRQTDASNRQTEASSRQTEASSRQTEASSRQTEASSRQIEASA

This is a significant internal repeat in the query protein sequence, as detected by the Prospero program.