The domain within your query sequence starts at position 33 and ends at position 304; the E-value for the Sp38 domain shown below is 4.5e-142.

MDIDRANKETVDPTYLWTGPNENTLKGNSQINITNTGELVLKDFLEPLSGLYSCMLSYKT
IKAETQEETMIKKKYDFLVFAYREPDYSYHMAVRFTTGSCVGRHNDLLFRVLKKILDNLI
SDLLCHVIEPSYKCHFVKLPERDFLYELFIAFQVNPFAPGWRSLCNRSADCEDITNHNVL
KARDRMEEFFRKQAHILHHHFNRTVPAMHFVDHSFQVTRIDNCRPGFGKNEGLHSNCATC
CVVCSPGTFSPDVDVTCQICVSVHIYGAKACP

Sp38

Sp38
PFAM accession number:PF07354
Interpro abstract (IPR010857):

This family contains a number of zona-pellucida-binding proteins that seem to be restricted to mammals. These are sperm proteins that bind to the 90kDa family of zona pellucida glycoproteins in a calcium-dependent manner [ (PUBMED:7729589) ]. These represent some of the specific molecules that mediate the first steps of gamete interaction, allowing fertilisation to occur [ (PUBMED:9378618) ].

GO process:binding of sperm to zona pellucida (GO:0007339)
GO component:extracellular region (GO:0005576)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry Sp38