The domain within your query sequence starts at position 515 and ends at position 721; the E-value for the 1u31 domain shown below is 1e-145.

MNRSLANVILGGYGTTSTAGGKPMEISGTHTEINLDNAVEMIREANSIVITPGYGLCAAK
AQYPIADLVKMLTEQGKKVRFGIHPVAGRMPGQLNVLLAEAGVPYDIVLEMDEINSDFPD
TDLVLVIGANDTVNSAAQEDPNSIIAGMPVLEVWKSKQVIVMKRSLGVGYAAVDNPIFYK
PNTAMLLGDAKKTCDALQAKVRESYQK

This is a PDB domain - please see the PDBSUM entry of 1u31 for further annotation