SUPERFAMILY 1.75 HMM library and genome assignments server

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Amidase signature (AS) enzymes superfamily

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   Alpha and beta proteins (a/b) [ 51349] (147)
Fold:   Amidase signature (AS) enzymes [ 75303]
Superfamily:   Amidase signature (AS) enzymes [ 75304]
Families:   Amidase signature (AS) enzymes [ 75305] (4)

Superfamily statistics
Genomes (2,888) Uniprot 2017_06 genome PDB chains (SCOP 1.75)
Domains 11,110 60,052 12
Proteins 11,021 59,772 12

Functional annotation
General category Metabolism
Detailed category Other enzymes

Function annotation of SCOP domain superfamilies

Gene Ontology (high-quality)

(show details)
GO termFDR (singleton)FDR (all)SDFO levelAnnotation (direct or inherited)
Molecular Function (MF)hydrolase activity0.0019250.00001843Least InformativeInherited
Molecular Function (MF)hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds0.00000000000031440InformativeDirect

Document: GO annotation of SCOP domains

Gene Ontology (high-coverage)

(show details)
GO term FDR (all) SDFO level Annotation (direct or inherited)
Biological Process (BP) cellular nitrogen compound metabolic process 0.3962 Least Informative Inherited
Biological Process (BP) cellular catabolic process 0.01389 Moderately Informative Inherited
Molecular Function (MF) hydrolase activity 0.00001843 Least Informative Direct
Molecular Function (MF) hydrolase activity, acting on carbon-nitrogen (but not peptide) bonds 0 Informative Direct
Molecular Function (MF) ligase activity 0.002049 Informative Inherited

Document: GO annotation of SCOP domains

Enzyme Commission (EC)

(show details)
EC termFDR (all)SDEO levelAnnotation (direct or inherited)
Enzyme Commission (EC)In linear amides0.000000000002133Moderately InformativeDirect

Document: EC annotation of SCOP domains

UniProtKB KeyWords (KW)

(show details)
KW termFDR (all)SDKW levelAnnotation (direct or inherited)
Biological processProtein biosynthesis0InformativeDirect
Biological processAuxin biosynthesis0Highly InformativeDirect
Cellular componentMitochondrion0.0000001029Moderately InformativeDirect
Molecular functionNucleotide-binding0Least InformativeDirect

Document: KW annotation of SCOP domains

InterPro annotation
Cross references IPR000120 SSF75304 Protein matches

Amidase signature (AS) enzymes are a large group of hydrolytic enzymes that contain a conserved stretch of approximately 130 amino acids known as the AS sequence. They are widespread, being found in both prokaryotes and eukaryotes. AS enzymes catalyse the hydrolysis of amide bonds (CO-NH2), although the family has diverged widely with regard to substrate specificity and function. Nonetheless, these enzymes maintain a core alpha/beta/alpha structure, where the topologies of the N- and C-terminal halves are similar. AS enzymes characteristically have a highly conserved C-terminal region rich in serine and glycine residues, but devoid of aspartic acid and histidine residues, therefore they differ from classical serine hydrolases. These enzymes posses a unique, highly conserved Ser-Ser-Lys catalytic triad used for amide hydrolysis, although the catalytic mechanism for acyl-enzyme intermediate formation can differ between enzymes [PubMed15595822]. Examples of AS enzymes include:

  • Peptide amidase (Pam) [PubMed15595822], which catalyses the hydrolysis of the C-terminal amide bond of peptides.
  • Fatty acid amide hydrolases [PubMed17015445], which hydrolyse fatty acid amid substrates (e.g. cannabinoid anandamide and sleep-inducing oleamide), thereby controlling the level and duration of signalling induced by this diverse class of lipid transmitters.
  • Malonamidase E2 [PubMed12032064], which catalyses the hydrolysis of malonamate into malonate and ammonia, and which is involved in the transport of fixed nitrogen from bacteroids to plant cells in symbiotic nitrogen metabolism.
  • Subunit A of Glu-tRNA(Gln) amidotransferase [PubMed12521300],a heterotrimeric enzyme that catalyses the formation of Gln-tRNA(Gln) by the transamidation of misacylated Glu-tRNA(Gln) via amidolysis of glutamine.

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

Jump to [ Top of page · SCOP classification · InterPro annotation · PDBeMotif links · Functional annotation · Gene Ontology (high-quality) · Gene Ontology (high-coverage) · Enzyme Commission (EC) · UniProtKB KeyWords (KW) ]

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 5 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 Amidase signature (AS) enzymes 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 5 hidden Markov models representing the Amidase signature (AS) enzymes 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 · Gene Ontology (high-quality) · Gene Ontology (high-coverage) · Enzyme Commission (EC) · UniProtKB KeyWords (KW) · Internal database links ]