The domain within your query sequence starts at position 4 and ends at position 125; the E-value for the 3u12 domain shown below is 2e-71.

LKIYGPIRIRSMQTGITKWKEGSFEIVEKDNRVSLLVHYNTGGIPRVFQLSHNIKNVVLR
PSGIKQSRLMLTLQDNSFLSIDKVPSKDAEEMRLFLDAVHQNRLHAAMKASQGSGSFGTI
LG

This is a PDB domain - please see the PDBSUM entry of 3u12 for further annotation