The domain within your query sequence starts at position 226 and ends at position 510; the E-value for the 4egc domain shown below is 1e-135.
KRKADASSSQDSELERVFLWDLDETIIIFHSLLTGSYAQKYGKDPTVVIGSGLTMEEMIF
EVADTHLFFNDLEECDQVHVEDVASDDNGQDLSNYSFSTDGFSGSGGSGSHGSSVGVQGG
VDWMRKLAFRYRKVREIYDKHKSNVGGLLSPQRKEALQRLRAEIEVLTDSWLGTALKSLL
LIQSRKNCANVLITTTQLVPALAKVLLYGLGEIFPIENIYSATKIGKESCFERIVSRFGK
KVTYVVIGDGRDEEIAAKQHNMPFWRITNHGDLVSLHQALELDFL
This is a PDB domain - please see the PDBSUM entry of 4egc for further annotation