SUPERFAMILY 1.73 HMM library and genome assignments server


Class II aaRS ABD-related 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:   Anticodon-binding domain-like [ 52953] (5)
  3 layers: a/b/a; mixed beta-sheet of five strands, order 21345; strand 4 is antiparallel to the rest
Superfamily:   Class II aaRS ABD-related [ 52954] (2)
Families:   Anticodon-binding domain of Class II aaRS [ 52955] (6)
  Brix domain [ 142420]
  Pfam 04427; tandem repeat of two ABD-like structural repeats, which are associated together with the formation of single beta-sheet, folded into half-barrel


Superfamily statistics
Genomes (1,233) UniProt 15.0 PDB chains (SCOP 1.73)
Domains 6,548 5,805 18
Proteins 6,547 5,805 18


Functional annotation
General category Information
Detailed category Translation

Function annotation of SCOP domain superfamilies
InterPro annotation
Cross references IPR004154 SSF52954 Protein matches
Abstract tRNA synthetases, or tRNA ligases are involved in protein synthesis. This domain is found in histidyl, glycyl, threonyl and prolyl tRNA synthetases [PubMed10447505] it is probably the anticodon binding domain [PubMed9115984].

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 ]

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 15 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 Class II aaRS ABD-related 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 15 hidden Markov models representing the Class II aaRS ABD-related 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 ]