The domain within your query sequence starts at position 284 and ends at position 770; the E-value for the RPT_1 domain shown below is 2.19e-39.

EMLLKSIQSSSQSSTVDTEKKEWLLKSIQSRIQSSSVDAEKKEWLLKFIQSSIQSSSVDL
EKKEWLLKSIQSSIQSAIVDRGTKEWLLESIQSSILSSIVDQGTKVLLLKSIQSSIQSST
LDIETKELLLKSIQSSIQSSIMDLGTKELLLKIIQSSIQSSSVDLGTKELLLKIIQSSIQ
SSTVDLGTKELLLKIIQSSIQSSSVDLGTKELLLKIIQSSIQSSTVDLGTKELLLKIIQS
SIQSSSVDLGAKMGLLESILSSIQSSNVDLETKVLLLKSIQSSIQSSTVYLGIKQWLLER
IESIIQSSSVYLDTKELLLKIIQSSIESYSVDLGNKEFLLKIILSSIQSSSVDLGTKELL
VKFFQSNIQSSSVIPGTKKLLVKIIQSSLQSSSVDLGTKKVLLDIIQTSIQNSNVHTERK
GLLLKIIQSSVQSSSVDQGTKEMLLEIIQSSIQNSSVNQWTKDLLLKIIQSIIQSSSVDL
GTKGFLL

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