The domain within your query sequence starts at position 618 and ends at position 873; the E-value for the RPT_1 domain shown below is 3.17e-15.

DGSLETVAHELQRESQEINLPNQKNTSLGDMNCESHGPEVGFHADAQLEADQSPVNPEEV
DLDLENQSVHSGISNLSFDSNASYQSANDQPQGAWGEVNLDELNVDMEVKSNGCSSSELT
FDSDSPLLSVTERSLLDFEGLNEDDFNLEDENCVSSSSDITFDSDIPDDSVADQPQVAVY
EEEPVGLENKSNESCVSGITFDSDIPLHSGNDHPEVAVKEVIIKEDENVHLEGKNDNPSG
SEICLDSNVPLHSVTN

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