The domain within your query sequence starts at position 43 and ends at position 148; the E-value for the 3a4v domain shown below is 1e-18.

VLITGGLGQLGVGLANLLRKRFGKDNVILSDIRKPPAHVFHSGLHNVLDVAAEYNVRLFV
PSTIGAFGPTSPRNPAPDLCIQRPRTIYGVSKVHTELMGETTPSRF

This is a PDB domain - please see the PDBSUM entry of 3a4v for further annotation