The domain within your query sequence starts at position 347 and ends at position 400; the E-value for the RPT_1 domain shown below is 5.11e-17.

KGSKGDTGIQGQKGTKGESGVPGLVGRKGDTGSPGLAGPKGEPGRVGQKGDPGM

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