The domain within your query sequence starts at position 240 and ends at position 308; the E-value for the RPT_1 domain shown below is 2.67e-29.

VTPPIEPVLEPSHQGLEPVLDSELVTPPIEPVLEPSHQGLEPVLDSELVTPPIEPLLEPS
HQGLEPVVD

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