The domain within your query sequence starts at position 329 and ends at position 402; the E-value for the RPT_3 domain shown below is 4.13e-5.

PLSPAAVPGNQMPPRPPSGQSDSIMHPSMNQSSIAQDRGYMQRNPQMPQYTSPQPGSALS
PRQPSGGQMHSGVG

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