The domain within your query sequence starts at position 301 and ends at position 355; the E-value for the RPT_1 domain shown below is 2.21e-6.

KKPKGRGFIKPGKDETRPGKHDQGAPAGKKPRGRGFTQPLEDEARPGRDVQVAPA

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