The domain within your query sequence starts at position 3 and ends at position 171; the E-value for the 4exv domain shown below is 1e-9.

LLPCNPHGNGLLYAGFNQDHGCFACGMENGFRVYNTDPLKEKEKQVMIWDDLKKKTVIEI
EFSTEVKAVKLRRDRIVVVLDSMIKVFTFTHNPHQLHVFETCYNPKGLCVLCPNSNNSLL
AFPGTHTGHVQLVDLASTEKPPVDIPAHEGVLSCIALNLQGTRIATASE

This is a PDB domain - please see the PDBSUM entry of 4exv for further annotation