The domain within your query sequence starts at position 1 and ends at position 320; the E-value for the 4n78 domain shown below is < 1e-12.
MPLVKRNIDPRHLCHTALPRGIKNELECVTNISLANIIRQLSSLSKYAEDIFGELFNEAH
SFSFRVNSLQERVDRLSVSVTQLDPKEEELSLQDITMRKAFRSSTIQDQQLFDRKTLPIP
LQETYDVCEQPPPLNILTPYRDDGKEGLKFYTNPSYFFDLWKEKMLQDTEDKRKEKRKQK
QKNLDRPHEPEKVPRAPHDRRREWQKLAQGPELAEDDADLLHKHIEVANGPASHYETRPQ
TYVDHMDGSYSLSALPFSQMSELLTRAEERVLVRPHEPPPPPPMHGAGDAKPTPTCISSA
TGLIENRPQSPAAGRTPVFV
This is a PDB domain - please see the PDBSUM entry of 4n78 for further annotation