The domain within your query sequence starts at position 777 and ends at position 852; the E-value for the RPT_1 domain shown below is 1.21e-6.

PKSFKRKISVVSATKGVQAGNSDTEGGQPGRKRRWGASTAATQKKPSISITTESLKSLIP
DIKPLAGQEAVVDLHA

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