Summary: Retinoblastoma-associated protein A domain
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Retinoblastoma-associated protein A domain Provide feedback
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This tab holds annotation information from the InterPro database.
InterPro entry IPR002720Retinoblastoma-like and retinoblastoma-associated proteins may have a function in cell cycle regulation. They form a complex with adenovirus E1A and Simian virus 40 (SV40) large T antigen, and may bind and modulate the function of certain cellular proteins with which T and E1A compete for pocket binding. The proteins may act as tumor suppressors, and are potent inhibitors of E2F-mediated trans-activation. This domain has the cyclin fold [PUBMED:8152925].
The crystal structure of the Rb pocket bound to a nine-residue E7 peptide containing the LxCxE motif, shared by other Rb-binding viral and cellular proteins, shows that the LxCxE peptide binds a highly conserved groove on the B-box portion of the pocket; the A-box portion appears to be required for the stable folding of the B box (see INTERPRO). Also highly conserved is the extensive A-B interface, suggesting that it may be an additional protein-binding site. The A and B boxes each contain the cyclin-fold structural motif, with the LxCxE-binding site on the B-box cyclin fold being similar to a Cdk2-binding site of cyclin A and to a TBP-binding site of TFIIB [PUBMED:9495340].
The A and B boxes are found at the C-terminal end of the protein; the A-box is on N-terminal side of the B-box.
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||nucleus (GO:0005634)|
|Biological process||regulation of cell cycle (GO:0051726)|
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This Clan contains cyclins, Transcription factor IIB (TFIIB), and the Retinoblastoma tumour suppressor proteins. These were predicted to be related by sequence .
The clan contains the following 10 members:CDK5_activator Cyclin Cyclin_C Cyclin_C_2 Cyclin_N Herp-Cyclin K-cyclin_vir_C RB_A RB_B TFIIB
We make a range of alignments for each Pfam-A family:
- the curated alignment from which the HMM for the family is built
- the alignment generated by searching the sequence database using the HMM
- Representative Proteomes (RPs) at 15%, 35%, 55% and 75% co-membership thresholds
- alignment generated by searching the UniProtKB sequence database using the family HMM
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- alignment generated by searching the metagenomics sequence database using the family HMM
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Curation and family details
|Number in seed:||77|
|Number in full:||404|
|Average length of the domain:||190.20 aa|
|Average identity of full alignment:||37 %|
|Average coverage of the sequence by the domain:||20.44 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 11927849 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||14|
|Download:||download the raw HMM for this family|
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There are 7 interactions for this family. More...
For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the RB_A domain has been found. There are 19 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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