The domain within your query sequence starts at position 819 and ends at position 891; the E-value for the RPT_1 domain shown below is 3.29e-10.

EDKATGKSAEESPSGTLEATEKEPVNKESEEMSVVFISNLPNKGYSTEEIYNLAKPFGAL
KDILVLSSHKKAY

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