The domain within your query sequence starts at position 616 and ends at position 790; the E-value for the RPT_3 domain shown below is 5.37e-6.

TTPGAKNKAKGNRNSVPKAGAGPDTTGSAQSQTVANSHSEALPGAKNKVKSNSNVVPKAE
AGVGACPQSVPASQGTALTGTKTKVKGNSSAVSKPDAGAGTMGSAHAKTAANSQGETLPG
SKNKVKGNSNAVPKAEAGAGTTEPNQPQAEALLGARNKVKGNSNSVPKAESGAST

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