The domain within your query sequence starts at position 579 and ends at position 832; the E-value for the RPT_1 domain shown below is 3.21e-17.

SAGHVPSASGDAIQSPGGMSPTSRDRMQSPGGVSLATEDSIQLPGGVPLSSDVIQSQGGV
PLSSKDRMQSPGGVPPSSGDMIQSQGGVPQSLGDAIQSAGGVPQSSGDAIQSPGGVSLAT
GDSIQLPGGVPLSSGDVIQSQGGVPRSSRDRMQSPGGVPPSSGGVIQSPGGVSPASGDAI
QSPGSVLPASGDAIQSAGGVLLASGDAIQSPRSVPQSPSGTLRSPGNMSESLGDTPNLSG
DVSNSPQALLDLAR

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