Summary: Helically-extended SH3 domain
Helically-extended SH3 domain Provide feedback
This domain is the 70 C-terminal residues of ADAP - Adhesion and de-granulation promoting adapter protein. It shows homology to SH3 domains; however, conserved residues of the fold are absent. It thus represents an altered SH3 domain fold. An N-terminal, amphipathic, helix makes extensive contacts to residues of the regular SH3 domain fold thereby creating a composite surface with unusual surface properties. The domain can no longer bind conventional proline-rich peptides . There are key phosphorylation sites within the two hSH3 domains and it would appear that binding at these sites does not materially affect the folding of these regions although the equilibrium towards the unfolded state may be slightly altered . The binding partners of the hSH3 domains are still unknown .
Sylvester M, Kliche S, Lange S, Geithner S, Klemm C, Schlosser A, Grossmann A, Stelzl U, Schraven B, Krause E, Freund C;, PLoS One. 2010;5:e11708.: Adhesion and degranulation promoting adapter protein (ADAP) is a central hub for phosphotyrosine-mediated interactions in T cells. PUBMED:20661443 EPMC:20661443
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This tab holds annotation information from the InterPro database.
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Src homology-3 (SH3) domains are comprised of about 60 amino acids, performing either an assembly or regulatory role. For example, SH3 domains in the Grb2 adaptor protein are essential for protein-protein interactions and signal transduction in the p21 Ras-dependent growth factor signaling pathway. Alternatively, SH3 performs a regulatory role in the Src family of tyrosine kinases. SH3 domains bind a variety of peptide ligands, many of which contain a PxxP motif. This PxxP motif is flanked by different specificity elements . Structures of SH3 domains, both free and ligand complexed, have provided insights into the mechanism of ligand recognition. The SH3 fold consists of two anti-parallel beta sheets that lie at right angles to each other. Within the fold, there are two variable loops, referred to as RT and n-Src loops. When SH3 binds to its ligand, the proline rich ligand adopts a PPII helix conformation, with the PPII helix structure recognised by a pair of grooves on the surface of the SH3 domain that bind turns of the helix. The SH3 grooves are formed by a series of nearly parallel, well-conserved aromatic residues .
The clan contains the following 9 members:hSH3 SH3_1 SH3_2 SH3_3 SH3_4 SH3_5 SH3_6 SH3_8 SH3_9
We make a range of alignments for each Pfam-A family:
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Curation and family details
This family is new in this Pfam release.
|Number in seed:||3|
|Number in full:||112|
|Average length of the domain:||81.50 aa|
|Average identity of full alignment:||52 %|
|Average coverage of the sequence by the domain:||13.02 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||1|
|Download:||download the raw HMM for this family|
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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 hSH3 domain has been found. There are 1 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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