| Accession: | |
|---|---|
| Functional site class: | IAP-binding motif (IBM) |
| Functional site description: | The IBM specifically binds to the conserved BIR (baculoviral IAP repeat) domain that is found in Inhibitor of Apoptosis Proteins (IAPs). The motif is located at the N-terminal regions of caspases and pro-apoptotic IAP-antagonising proteins. In non-apoptotic cells, caspase activity is suppressed by the binding of IAPs to activated caspases. Upon apoptotic stimuli, pro-apoptotic IAP-antagonising proteins compete with the caspases for binding to the IAP or mediate their proteolytic degradation which leads to apoptosis promotion. |
| ELMs with same func. site: | LIG_BIR_II_1 LIG_BIR_III_1 LIG_BIR_III_2 LIG_BIR_III_3 LIG_BIR_III_4 |
| ELM Description: | Type III BIR domains are characterised by conserved Glu/Gln and Trp residues in the IBM binding groove. They bind neo N-terminal motifs that are revealed after cleavage of pro-caspases into effector or initiator caspases. As caspases are commonly cleaved by other caspases or granzyme B, the motif is predominantly found C-terminal of aspartate residues. IBMs selective for type III BIR domains contain a conserved alanine residue in the first position followed by a variable position, a conserved proline in the third and another variable residue in the fourth position (DA.P.). In humans, the proline residue seems to be highly selective, as it enables a kink in the peptide chain, which is necessary for the accommodation of the P4 residue into its binding groove (Eckelman,2008). |
| Pattern: | DA.P. |
| Pattern Probability: | 0.0003511 |
| Present in taxon: | Metazoa |
| Interaction Domain: |
BIR (PF00653)
Inhibitor of Apoptosis domain
(Stochiometry: 1 : 1)
PDB Structure: 1NW9
|
| Acc., Gene-, Name | Start | End | Subsequence | Logic | #Ev. | Organism | Notes |
|---|---|---|---|---|---|---|---|
| P55210 CASP7 CASP7_HUMAN |
23 | 27 | SANEDSVDAKPDRSSFVPSL | TP | 1 | Homo sapiens (Human) | |
| Q7K4Z4 imd Q7K4Z4_DROME |
30 | 34 | VEGRLEKDAAPVDDNEPDNN | TP | 1 | Drosophila melanogaster (Fruit fly) | |
| P55211 CASP9 CASP9_HUMAN |
315 | 319 | PGSNPEPDATPFQEGLRTFD | TP | 4 | Homo sapiens (Human) |