The domain within your query sequence starts at position 1536 and ends at position 1650; the E-value for the RPT_1 domain shown below is 5.43e-6.

ALDQDNRAAGQKDGTLKEDKTQGQKSSFLEDKSTTPKEMTLDQKSPEKAKGVEQQDGAVP
EKTRALGLEESPEEEGKAREQEEKYWKEQDVVQGWRETSPTRGEPVPAWEGKSPE

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