The domain within your query sequence starts at position 1 and ends at position 281; the E-value for the CTP_synth_N domain shown below is 1.7e-124.

MKYILVTGGVISGIGKGIIASSIGTILKSCGLRVTAIKIDPYINIDAGTFSPYEHGEVFV
LNDGGEVDLDLGNYERFLDINLYKDNNITTGKIYQHVINKERRGDYLGKTVQVVPHITDA
IQEWVMNQAKVSVDGNKEDPQICVIELGGTIGDIEGMAFVEAFRQFQFKAKKENFYNIHV
SLVPQPSATGEQKTKPTQNSVRALRGLGLSPDLIVCRSSTPIEMAVKEKISMFCHVNPEQ
VICIHDVSSIYRVPLLLEEQGVVKYFQERLGLPINDCSSNL

CTP_synth_N

CTP_synth_N
PFAM accession number:PF06418
Interpro abstract (IPR017456):

CTP synthase is involved in pyrimidine ribonucleotide/ribonucleoside metabolism, catalysing the synthesis of CTP from UTP by amination of the pyrimidine ring at the 4-position [ (PUBMED:12522217) ]. The enzyme exists as a dimer of identical chains that aggregates as a tetramer. This gene has been found roughly 500 bp upstream of enolase in both beta (Nitrosomonas europaea) and gamma (Escherichia coli) subdivisions of Proteobacterium [ (PUBMED:9711852) ].

GO process:pyrimidine nucleotide biosynthetic process (GO:0006221)
GO function:CTP synthase activity (GO:0003883)

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