The domain within your query sequence starts at position 2 and ends at position 277; the E-value for the CTP_synth_N domain shown below is 2.8e-135.

KYILVTGGVISGIGKGVIASSVGTILKSCGLHVTSIKIDPYINIDAGTFSPYEHGEVFVL
DDGGEVDLDLGNYERFLDIRLTKDNNLTTGKIYQYVINKERKGDYLGKTVQVVPHITDAI
QEWVMRQALIPVDEDGLEPQVCVIELGGTVGDIESMPFIEAFRQFQFKVKRENFCNIHVS
LVPQPSSTGEQKTKPTQNSVRELRGLGLSPDLVVCRCSNPLDTSVKEKISMFCHVEPEQV
ICVHDVSSIYRVPLLLEEQGVVDYFLRRLDLPIERQ

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