The domain within your query sequence starts at position 394 and ends at position 481; the E-value for the RPT_1 domain shown below is 2.97e-19.

HSKRRNDDFQNEFDDYNKVQESRESEPKTSFRRMDSSFETHNYEEMVDRRSSHTMFEEGL
PCETFQTYTDPYSSAQAVENTLPHCLPA

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