The domain within your query sequence starts at position 1388 and ends at position 1758; the E-value for the RPT_5 domain shown below is 5.53e-5.

GPEVSVDSNDPCQSVAGHLQKPDKEMNLKEDHIYLEDKSYKLVDFEPTYDSDDPVQFVTV
PSVEAVSIKEVNLQKENPDDLENENFQPCCSEVACNSAVHLQSEADPPQVACKEADLDKK
ALDIEDKGSVTCVPEVVYDSDVSFQIVVNQVQTSDGETDSPQVVFVDVVSSDSDCDREVI
SDSNIPLQLEPPQMTVKETSDINTDSLGSAANEKYYCKFCGCDYEASQSVTNQSKESFKI
INRKNDYIILGDSTCPSCGHELNFNVDPSDQPTTCQLQQPDRNFIDPEDKNFGSKCPKRK
LNWEDTAHPVTHQLQKTGEATSLRKDQKNRFKRDRGWESSSFAGDHAAYAVSVIRQTALN
SCGSELNFQDD

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