SUPERFAMILY 1.73 HMM library and genome assignments server


Carbamoyl phosphate synthetase, small subunit N-terminal domain superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   Alpha and beta proteins (a/b) [ 51349] (141)
  Mainly parallel beta sheets (beta-alpha-beta units)
Fold:   The "swivelling" beta/beta/alpha domain [ 52008] (10)
  3 layers: b/b/a; the central sheet is parallel, and the other one is antiparallel; there are some variations in topology
this domain is thought to be mobile in most multi-domain proteins known to contain it
Superfamily:   Carbamoyl phosphate synthetase, small subunit N-terminal domain [ 52021]
Families:   Carbamoyl phosphate synthetase, small subunit N-terminal domain [ 52022]


Superfamily statistics
Genomes (1,114) UniProt 15.0 PDB chains (SCOP 1.73)
Domains 1,380 2,114 6
Proteins 1,380 2,114 6


Functional annotation
General category Metabolism
Detailed category Coenzyme metabolism and transport

Function annotation of SCOP domain superfamilies
InterPro annotation
Cross references IPR002474 SSF52021 Protein matches
Abstract The carbamoyl-phosphate synthase domain is in the N terminus of the protein. Carbamoyl-phosphate synthase catalyses the ATP-dependent synthesis of carbamoyl-phosphate from glutamine or ammonia and bicarbonate. This important enzyme initiates both the urea cycle and the biosynthesis of arginine and/or pyrimidines [PubMed1972379]. The carbamoyl-phosphate synthase (CPS) enzyme in prokaryotes is a heterodimer of a small and large chain. The small chain promotes the hydrolysis of glutamine to ammonia, which is used by the large chain to synthesize carbamoyl phosphate.

InterPro database

PDBeMotif information about ligands, sequence and structure motifs
Cross references PDB entries
Ligand binding statistics
Nucleic-acid binding statistics
Occurrence of secondary structure elements
Occurrence of small 3D structural motifs

PDBeMotif resource

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Internal database links

Browse genome assignments for this superfamily. The SUPERFAMILY hidden Markov model library has been used to carry out SCOP domain assignments to all genomes at the superfamily level.


Alignments of sequences to 1 models in this superfamily are available by clicking on the 'Alignments' icon above. PDB sequences less than 40% identical are shown by default, but any other sequence(s) may be aligned. Select PDB sequences, genome sequences, or paste in or upload your own sequences.


Browse and view proteins in genomes which have different domain combinations including a Carbamoyl phosphate synthetase, small subunit N-terminal domain domain.


Examine the distribution of domain superfamilies, or families, across the major taxonomic kingdoms or genomes within a kingdom. This gives an immediate impression of how superfamilies, or families, are restricted to certain kingdoms of life.


Explore domain occurrence network where nodes represent genomes and edges are domain architectures (shared between genomes) containing the superfamily of interest.

There are 1 hidden Markov models representing the Carbamoyl phosphate synthetase, small subunit N-terminal domain superfamily. Information on how the models are built, and plots showing hydrophobicity, match emmission probabilities and insertion/deletion probabilities can be inspected.


Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Internal database links ]