The domain within your query sequence starts at position 688 and ends at position 842; the E-value for the Methyltransf_15 domain shown below is 5e-48.

CDVVVDAFCGVGGNTIQFALTGKRVIAIDIDPVKIDLARNNAEVYGVADKIKFICGDFLL
LAPCLKADVVFLSPPWGGPDYATAETFDIRTMMSLDGFEIFRLSQKITNNIVYFLPRNVD
IDQVASLAGLGGQVEIEQNFLNNKLKTITAYFGDL

Methyltransf_15

Methyltransf_15
PFAM accession number:PF09445
Interpro abstract (IPR019012):

RNA cap guanine-N2 methyltransferases such as Schizosaccharomyces pombe (Fission yeast) trimethylguanosine synthase (Tgs1) and Giardia lamblia (Giardia intestinalis) Tgs2, catalyse the methylation step(s) for the conversion of the 7-monomethylguanosine (m(7)G) caps of snRNAs and snoRNAs to a 2,2,7-trimethylguanosine (m(2,2,7)G) cap structure [(PUBMED:17284461), (PUBMED:18840651), (PUBMED:15590684)]. Trimethylguanosine synthase is specific for guanine, and N7 methylation must precede N2 methylation. This enzyme is required for pre-mRNA splicing, pre-rRNA processing and small ribosomal subunit synthesis. As such, this enzyme plays a role in transcriptional regulation.

GO process:RNA methylation (GO:0001510), 7-methylguanosine RNA capping (GO:0009452)
GO function:methyltransferase activity (GO:0008168)

This is a PFAM domain. For full annotation and more information, please see the PFAM entry Methyltransf_15