SUPERFAMILY 1.75 HMM library and genome assignments server

SUPERFAMILY 2 can be accessed from Please contact us if you experience any problems.

9ant A: PDB entry domain

SCOP classification
Root:   SCOP hierarchy in SUPERFAMILY [ 0] (11)
Class:   All alpha proteins [ 46456] (284)
Fold:   DNA/RNA-binding 3-helical bundle [ 46688] (14)
Superfamily:   Homeodomain-like [ 46689] (19)
Family:   Homeodomain [ 46690] (40)
Protein:   Antennapedia Homeodomain [46716]
PDB Entry Domain:   9ant A: [ 16004]
  SUPERFAMILY domain annotation for 9anta
  PDB structure summary for 9ant

InterPro annotation
Cross references IPR009057 SSF46689 Protein matches

Homeodomain proteins are transcription factors that share a related DNA binding homeodomain [PubMed10377888]. The homeodomain was first identified in a number of Drosophila homeotic and segmentation proteins, but is now known to be well conserved in many other animals, including vertebrates. The domain binds DNA through a helix-turn-helix (HTH) structure. The HTH motif is characterised by two alpha-helices, which make intimate contacts with the DNA and are joined by a short turn. The second helix binds to DNA via a number of hydrogen bonds and hydrophobic interactions, which occur between specific side chains and the exposed bases and thymine methyl groups within the major groove of the DNA. The first helix helps to stabilise the structure. Many proteins contain homeodomains, including Drosophila Engrailed, yeast mating type proteins, hepatocyte nuclear factor 1a and HOX proteins.

The homeodomain motif is very similar in sequence and structure to domains in a wide range of DNA-binding proteins, including recombinases, Myb proteins, GARP response regulators, human telomeric proteins (hTRF1), paired domain proteins (PAX), yeast RAP1, centromere-binding proteins CENP-B and ABP-1, transcriptional regulators (TyrR), AraC-type transcriptional activators, and tetracycline repressor-like proteins (TetR, QacR, YcdC) [PubMed12215502, PubMed9739097, PubMed7707374].

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 ]

Internal database links

Superfamily level     Family level

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.

Superfamily level     Family level

Alignments of sequences to 187 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.

Superfamily level

Browse and view proteins in genomes which have different domain combinations including a Homeodomain-like domain.

Superfamily level     Family level

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.

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