The domain within your query sequence starts at position 1375 and ends at position 1560; the E-value for the RPT_3 domain shown below is 6.78e-17.

MPGMSTSQEGTPTSKIPVTQTTTHRVPSPSITNQSTTMFQTTTVQEAEITQTLAPSTYTT
NDITKTQNLFSTGKTSASYTTQHQSTSFHLTTISKWPTNGVSDTPGVHTSSGTPSSSHAT
HITYTPPTQVVSSITHSTGPPLGTSVQTTINFPTLSAPQTSLVTPHPGLSSSSTALTSEI
LKTPTS

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