The domain within your query sequence starts at position 306 and ends at position 406; the E-value for the RPT_1 domain shown below is 6.88e-12.

LGTGTTAVFINKDLGKKPGAITTVGLLSKESGKKLGIGIVPGLVNKESGKKLGLGTVVGL
VNKELGKKLSSTVGLVAKDVTKKIVASSAMGLVNKDIGKKL

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