The domain within your query sequence starts at position 817 and ends at position 892; the E-value for the RPT_1 domain shown below is 1.63e-6.

PKSFKRKISVVSATKGVQAGNSDTEGGQPGRKRRWGASTAATQKKPSISITTESLKSLIP
DIKPLAGQEAVVDLHA

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