The domain within your query sequence starts at position 47 and ends at position 406; the E-value for the ALG3 domain shown below is 2.5e-145.

SCLCIAEVGITFWVIHRVAYTEIDWKAYMAQVEGFINGTYDYTQLQGDTGPLVYPAGFLY
IFTGLFYATDRGTDIPMAQNIFAVLYLVTLVLVFLIYHQTSKVPPFVFFFMCCASYRVHS
IFVLRLFNDPVAMALLFLSINLFLAQCWSWGCCCFSLAVSVKMNVLLFAPGLLFLLLTQF
GFRGALPKLAICAALQVVLGLPFLLENPIGYLSRSFDLGRQFLFQWTVNWRFLPETIFLH
RAFHLALLAAHLSLLLLFALCRWHRTGESILALLKDPSKRKVPPQALTPNQIVSILFTSN
FIGICFSRSLHYQFYVWYFHTLPYLLWAMPARWLTHLLRLLVLGLIELSWNTYPSTSFSS

ALG3

 ALG3
PFAM accession number:PF05208
Interpro abstract (IPR007873):

The formation of N-glycosidic linkages of glycoproteins involves the ordered assembly of the common Glc3Man9GlcNAc2 core-oligosaccharide on the lipid carrier dolichyl pyrophosphate. Whereas early mannosylation steps occur on the cytoplasmic side of the endoplasmic reticulum with GDP-Man as donor, the final reactions from Man5GlcNAc2-PP-Dol to Man9GlcNAc2-PP-Dol on the lumenal side use Dol-P-Man [ (PUBMED:11308030) ]. The ALG3 gene encodes the Dol-P-Man:Man5GlcNAc2-PP-Dol mannosyltransferase.

GO function:mannosyltransferase activity (GO:0000030)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry ALG3