The domain within your query sequence starts at position 248 and ends at position 378; the E-value for the Na_Ca_ex_C domain shown below is 7.8e-50.

KRLLFYKYVYKRYRTDPRSGIIIGAEGDPPKSIELDGTFVGTEVPGELGALGTGPAEARE
LDASRREVIQILKDLKQKHPDKDLEQLMGIAKYYALLHQQKSRAFYRIQATRLMTGAGNV
LRRHAADAARR

Na_Ca_ex_C

 Na_Ca_ex_C
PFAM accession number:PF16494
Interpro abstract (IPR032452):

This is a C-terminal extension of the eukaryote sodium/calcium exchanger domain, and is cytoplasmic.

This is a PFAM domain. For full annotation and more information, please see the PFAM entry Na_Ca_ex_C