Summary: SH2 domain
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SH2 domain Edit Wikipedia article
|SCOPe||1sha / SUPFAM|
The SH2 (Src Homology 2) domain is a structurally conserved protein domain contained within the Src oncoprotein and in many other intracellular signal-transducing proteins. SH2 domains allow proteins containing those domains to dock to phosphorylated tyrosine residues on other proteins. SH2 domains are commonly found in adaptor proteins that aid in the signal transduction of receptor tyrosine kinase pathways.
SH2 is conserved by signalization of protein tyrosine kinase, which are binding on phosphotyrosine (pTyr). In the human proteome the class of pTyr-selective recognition domains is represented by SH2 domains. The N-terminal SH2 domains of cytoplasmic tyrosine kinase was at the beginning of evolution evolved with the occurrence of tyrosine phosphorylation. At the beginning it was supposed that, these domains serve as a substrate for their target kinase.
Protein-protein interactions play a major role in cellular growth and development. Modular domains, which are the subunits of a protein, moderate these protein interactions by identifying short peptide sequences. These peptide sequences determine the binding partners of each protein. One of the more prominent domains is the SH2 domain. SH2 domains play a vital role in cellular communication. Its length is approximately 100 amino acids long and it is found within 111 human proteins. Regarding its structure, it contains 2 alpha helices and 7 beta strands. Research has shown that it has a high affinity to phosphorylated tyrosine residues and it is known to identify a sequence of 3-6 amino acids within a peptide motif.
Binding and phosphorylation
SH2 domains typically bind a phosphorylated tyrosine residue in the context of a longer peptide motif within a target protein, and SH2 domains represent the largest class of known pTyr-recognition domains.
Phosphorylation of tyrosine residues in a protein occurs during signal transduction and is carried out by tyrosine kinases. In this way, phosphorylation of a substrate by tyrosine kinases acts as a switch to trigger binding to an SH2 domain-containing protein. Many tyrosine containing short linear motifs that bind to SH2 domains are conserved across a wide variety of higher Eukaryotes. The intimate relationship between tyrosine kinases and SH2 domains is supported by their coordinate emergence during eukaryotic evolution.
A detailed bioinformatic examination of SH2 domains of human and mouse reveals 120 SH2 domains contained within 115 proteins encoded by the human genome, representing a rapid rate of evolutionary expansion among the SH2 domains.
A large number of SH2 domain structures have been solved and many SH2 proteins have been knocked out in mice.
The function of SH2 domains is to specifically recognize the phosphorylated state of tyrosine residues, thereby allowing SH2 domain-containing proteins to localize to tyrosine-phosphorylated sites. This process constitutes the fundamental event of signal transduction through a membrane, in which a signal in the extracellular compartment is "sensed" by a receptor and is converted in the intracellular compartment to a different chemical form, i.e. that of a phosphorylated tyrosine. Tyrosine phosphorylation leads to activation of a cascade of protein-protein interactions whereby SH2 domain-containing proteins are recruited to tyrosine-phosphorylated sites. This process initiates a series of events which eventually result in altered patterns of gene expression or other cellular responses. The SH2 domain, which was first identified in the oncoproteins Src and Fps, is about 100 amino-acid residues long. It functions as a regulatory module of intracellular signaling cascades by interacting with high affinity to phosphotyrosine-containing target peptides in a sequence-specific and strictly phosphorylation-dependent manner.
SH2 domains, and other binding domains, have been used in protein engineering to create protein assemblies. Protein assemblies are formed when several proteins bind to one another to create a larger structure (called a supramolecular assembly). Using molecular biology techniques, fusion proteins of specific enzymes and SH2 domains have been created, which can bind to each other to form protein assemblies.
Since SH2 domains require phosphorylation in order for binding to occur, the use of kinase and phosphatase enzymes gives researchers control over whether protein assemblies will form or not. High affinity engineered SH2 domains have been developed and utilized for protein assembly applications.
The goal of most protein assembly formation is to increase the efficiency of metabolic pathways via enzymatic co-localization. Other applications of SH2 domain mediated protein assemblies have been in the formation of high density fractal-like structures, which have extensive molecular trapping properties.
Human proteins containing this domain include:
- ABL1; ABL2
- BCAR3; BLK; BLNK; BMX; BTK
- CHN2; CISH; CRK; CRKL; CSK
- FER; FES; FGR; FRK; FYN
- GRAP; GRAP2; GRB10; GRB14; GRB2; GRB7
- HCK; HSH2D
- INPP5D; INPPL1; ITK; JAK2; LCK; LCP2; LYN
- MATK; NCK1; NCK2
- PIK3R1; PIK3R2; PIK3R3; PLCG1; PLCG2; PTK6; PTPN11; PTPN6; RASA1
- SH2B1; SH2B2; SH2B3; SH2D1A; SH2D1B; SH2D2A; SH2D3A; SH2D3C; SH2D4A; SH2D4B; SH2D5; SH2D6; SH3BP2; SHB; SHC1; SHC3; SHC4; SHD; SHE
- SLA; SLA2
- SOCS1; SOCS2; SOCS3; SOCS4; SOCS5; SOCS6; SOCS7
- SRC; SRMS
- STAT1; STAT2; STAT3; STAT4; STAT5A; STAT5B; STAT6
- SUPT6H; SYK
- TEC; TENC1; TNS; TNS1; TNS3; TNS4; TXK
- VAV1; VAV2; VAV3
- YES1; ZAP70
- Phosphotyrosine-binding domains also bind phosphorylated tyrosines
- Anthony Pawson, discoverer of the SH2 Domain
- SH2 Domain website created by lab of Dr. Nash
- doi:10.1006/jmbi.1996.0112. PMID 8604142. ; Tong L, Warren TC, King J, Betageri R, Rose J, Jakes S (March 1996). "Crystal structures of the human p56lck SH2 domain in complex with two short phosphotyrosyl peptides at 1.0 A and 1.8 A resolution". Journal of Molecular Biology. 256 (3): 601â€“10.
- Sadowski I, Stone JC, Pawson T (December 1986). "A noncatalytic domain conserved among cytoplasmic protein-tyrosine kinases modifies the kinase function and transforming activity of Fujinami sarcoma virus P130gag-fps". Molecular and Cellular Biology. 6 (12): 4396â€“408. doi:10.1128/mcb.6.12.4396. PMC 367222. PMID 3025655.
- Russell RB, Breed J, Barton GJ (June 1992). "Conservation analysis and structure prediction of the SH2 family of phosphotyrosine binding domains". FEBS Letters. 304 (1): 15â€“20. doi:10.1016/0014-5793(92)80579-6. PMID 1377638.
- Koytiger G, Kaushansky A, Gordus A, Rush J, Sorger PK, MacBeath G (May 2013). "Phosphotyrosine signaling proteins that drive oncogenesis tend to be highly interconnected". Molecular & Cellular Proteomics. 12 (5): 1204â€“13. doi:10.1074/mcp.M112.025858. PMC 3650332. PMID 23358503.
- Chervitz SA, Aravind L, Sherlock G, Ball CA, Koonin EV, Dwight SS, Harris MA, Dolinski K, Mohr S, Smith T, Weng S, Cherry JM, Botstein D (December 1998). "Comparison of the complete protein sets of worm and yeast: orthology and divergence". Science. 282 (5396): 2022â€“8. doi:10.1126/science.282.5396.2022. PMC 3057080. PMID 9851918.
- Pawson T, Gish GD, Nash P (December 2001). "SH2 domains, interaction modules and cellular wiring". Trends in Cell Biology. 11 (12): 504â€“11. doi:10.1016/s0962-8924(01)02154-7. PMID 11719057.
- Liu BA, Shah E, Jablonowski K, Stergachis A, Engelmann B, Nash PD (December 2011). "The SH2 domain-containing proteins in 21 species establish the provenance and scope of phosphotyrosine signaling in eukaryotes". Science Signaling. 4 (202): ra83. doi:10.1126/scisignal.2002105. PMC 4255630. PMID 22155787.
- Pawson T, Gish GD, Nash P (December 2001). "SH2 domains, interaction modules and cellular wiring". Trends in Cell Biology. 11 (12): 504â€“11. doi:10.1016/S0962-8924(01)02154-7. PMID 11719057.
- Huang H, Li L, Wu C, Schibli D, Colwill K, Ma S, Li C, Roy P, Ho K, Songyang Z, Pawson T, Gao Y, Li SS (April 2008). "Defining the specificity space of the human SRC homology 2 domain". Molecular & Cellular Proteomics. 7 (4): 768â€“84. doi:10.1074/mcp.M700312-MCP200. PMID 17956856.
- Ren S, Yang G, He Y, Wang Y, Li Y, Chen Z (October 2008). "The conservation pattern of short linear motifs is highly correlated with the function of interacting protein domains". BMC Genomics. 9: 452. doi:10.1186/1471-2164-9-452. PMC 2576256. PMID 18828911.
- Eichinger L, Pachebat JA, GlÃ¶ckner G, Rajandream MA, Sucgang R, Berriman M, et al. (May 2005). "The genome of the social amoeba Dictyostelium discoideum". Nature. 435 (7038): 43â€“57. doi:10.1038/nature03481. PMC 1352341. PMID 15875012.
- Liu BA, Jablonowski K, Raina M, ArcÃ© M, Pawson T, Nash PD (June 2006). "The human and mouse complement of SH2 domain proteins-establishing the boundaries of phosphotyrosine signaling". Molecular Cell. 22 (6): 851â€“68. doi:10.1016/j.molcel.2006.06.001. PMID 16793553.
- Kaneko, T.; Huang, H.; Cao, X.; Li, X.; Li, C.; Voss, C.; Sidhu, S. S.; Li, S. S. C. (2012-09-25). "Superbinder SH2 Domains Act as Antagonists of Cell Signaling". Science Signaling. 5 (243): ra68. doi:10.1126/scisignal.2003021. ISSN 1945-0877. PMID 23012655.
- Yang, Lu; Dolan, E.M.; Tan, S.K.; Lin, T.; Sontag, E.D.; Khare, S.D. (2017). "Computation-Guided Design of a Stimulus-Responsive Multienzyme Supramolecular Assembly". ChemBioChem. 18 (20): 2000â€“2006. doi:10.1002/cbic.201700425. ISSN 1439-7633. PMID 28799209.
- HernÃ¡ndez N.E., Hansen W.A., Zhu D., Shea M.E., Khalid M., Manichev V., Putnins M., Chen M., Dodge A.G., Yang L., Marrero-BerrÃos I., Banal M., Rechani P., Gustafsson T., Feldman L.C., Lee S-.H., Wackett L.P., Dai W., Khare S.D. (2019). Stimulus-responsive self-assembly of protein-based fractals by computational design. Nat. Chem. 2019 11(7): 605-614. Pre-print available at bioRxiv doi: 10.1101/274183.
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Internal database links
|SCOOP:||Filamin PK_Tyr_Ser-Thr Pkinase SH2_2 SH3_1|
|Similarity to PfamA using HHSearch:||SH2_2 SH2_2|
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR000980
The Src homology 2 (SH2) domain is a protein domain of about 100 amino-acid residues first identified as a conserved sequence region between the oncoproteins Src and Fps [ PUBMED:3025655 ]. Similar sequences were later found in many other intracellular signal-transducing proteins [ PUBMED:1377638 ]. SH2 domains function as regulatory modules of intracellular signalling cascades by interacting with high affinity to phosphotyrosine-containing target peptides in a sequence-specific, SH2 domains recognise between 3-6 residues C-terminal to the phosphorylated tyrosine in a fashion that differs from one SH2 domain to another, and strictly phosphorylation-dependent manner [ PUBMED:7883800 , PUBMED:15335710 , PUBMED:14731533 , PUBMED:7531822 ]. They are found in a wide variety of protein contexts e.g., in association with catalytic domains of phospholipase Cy (PLCy) and the non-receptor protein tyrosine kinases; within structural proteins such as fodrin and tensin; and in a group of small adaptor molecules, i.e Crk and Nck. The domains are frequently found as repeats in a single protein sequence and will then often bind both mono- and di-phosphorylated substrates.
The structure of the SH2 domain belongs to the alpha+beta class, its overall shape forming a compact flattened hemisphere. The core structural elements comprise a central hydrophobic anti-parallel beta-sheet, flanked by 2 short alpha-helices. The loop between strands 2 and 3 provides many of the binding interactions with the phosphate group of its phosphopeptide ligand, and is hence designated the phosphate binding loop, the phosphorylated ligand binds perpendicular to the beta-sheet and typically interacts with the phosphate binding loop and a hydrophobic binding pocket that interacts with a pY+3 side chain. The N- and C-termini of the domain are close together in space and on the opposite face from the phosphopeptide binding surface and it has been speculated that this has facilitated their integration into surface-exposed regions of host proteins [ PUBMED:11911873 ].
Below is a listing of the unique domain organisations or architectures in which this domain is found. More...
The graphic that is shown by default represents the longest sequence with a given architecture. Each row contains the following information:
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a textual description of the architecture, e.g. Gla, EGF x 2, Trypsin.
This example describes an architecture with one
Gladomain, followed by two consecutive
EGFdomains, and finally a single
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This superfamily is characterised by proteins with the SH2-like fold. The proesence of this domain guides signal-transduction towards the phosphorylated tyrosine residues on its interacting protein-partner.
The clan contains the following 4 members:Cbl_N3 MelC1 SH2 SH2_2
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1Cannot generate PP/Heatmap alignments for seeds; no PP data available
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This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.
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|Number in seed:||52|
|Number in full:||59304|
|Average length of the domain:||78.50 aa|
|Average identity of full alignment:||28 %|
|Average coverage of the sequence by the domain:||13.73 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 61295632 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||27|
|Download:||download the raw HMM for this family|
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This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the More....
This chart is a modified "sunburst" visualisation of the species tree for this family. It shows each node in the tree as a separate arc, arranged radially with the superkingdoms at the centre and the species arrayed around the outermost ring.
How the sunburst is generated
The tree is built by considering the taxonomic lineage of each sequence that has a match to this family. For each node in the resulting tree, we draw an arc in the sunburst. The radius of the arc, its distance from the root node at the centre of the sunburst, shows the taxonomic level ("superkingdom", "kingdom", etc). The length of the arc represents either the number of sequences represented at a given level, or the number of species that are found beneath the node in the tree. The weighting scheme can be changed using the sunburst controls.
In order to reduce the complexity of the representation, we reduce the number of taxonomic levels that we show. We consider only the following eight major taxonomic levels:
Colouring and labels
Segments of the tree are coloured approximately according to their superkingdom. For example, archeal branches are coloured with shades of orange, eukaryotes in shades of purple, etc. The colour assignments are shown under the sunburst controls. Where space allows, the name of the taxonomic level will be written on the arc itself.
As you move your mouse across the sunburst, the current node will be highlighted. In the top section of the controls panel we show a summary of the lineage of the currently highlighed node. If you pause over an arc, a tooltip will be shown, giving the name of the taxonomic level in the title and a summary of the number of sequences and species below that node in the tree.
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There are some situations that the sunburst tree cannot easily handle and for which we have work-arounds in place.
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Some species in the taxonomic tree may not have one or more of the main eight levels that we display. For example, Bos taurus is not assigned an order in the NCBI taxonomic tree. In such cases we mark the omitted level with, for example, "No order", in both the tooltip and the lineage summary.
Unmapped species names
The tree is built by looking at each sequence in the full alignment for the family. We take the name of the species given by UniProt and try to map that to the full taxonomic tree from NCBI. In some cases, the name chosen by UniProt does not map to any node in the NCBI tree, perhaps because the chosen name is listed as a synonym or a misspelling in the NCBI taxonomy.
So that these nodes are not simply omitted from the sunburst tree, we group them together in a separate branch (or segment of the sunburst tree). Since we cannot determine the lineage for these unmapped species, we show all levels between the superkingdom and the species as "uncategorised".
Since we reduce the species tree to only the eight main taxonomic levels, sequences that are mapped to the sub-species level in the tree would not normally be shown. Rather than leave out these species, we map them instead to their parent species. So, for example, for sequences belonging to one of the Vibrio cholerae sub-species in the NCBI taxonomy, we show them instead as belonging to the species Vibrio cholerae.
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For large species trees, you may see blank regions in the outer layers of the sunburst. These occur when there are large numbers of arcs to be drawn in a small space. If an arc is less than approximately one pixel wide, it will not be drawn and the space will be left blank. You may still be able to get some information about the species in that region by moving your mouse across the area, but since each arc will be very small, it will be difficult to accurately locate a particular species.
The tree shows the occurrence of this domain across different species. More...
We show the species tree in one of two ways. For smaller trees we try to show an interactive representation, which allows you to select specific nodes in the tree and view them as an alignment or as a set of Pfam domain graphics.
Unfortunately we have found that there are problems viewing the interactive tree when the it becomes larger than a certain limit. Furthermore, we have found that Internet Explorer can become unresponsive when viewing some trees, regardless of their size. We therefore show a text representation of the species tree when the size is above a certain limit or if you are using Internet Explorer to view the site.
If you are using IE you can still load the interactive tree by clicking the "Generate interactive tree" button, but please be aware of the potential problems that the interactive species tree can cause.
For all of the domain matches in a full alignment, we count the number that are found on all sequences in the alignment. This total is shown in the purple box.
We also count the number of unique sequences on which each domain is found, which is shown in green. Note that a domain may appear multiple times on the same sequence, leading to the difference between these two numbers.
Finally, we group sequences from the same organism according to the NCBI code that is assigned by UniProt, allowing us to count the number of distinct sequences on which the domain is found. This value is shown in the pink boxes.
We use the NCBI species tree to group organisms according to their taxonomy and this forms the structure of the displayed tree. Note that in some cases the trees are too large (have too many nodes) to allow us to build an interactive tree, but in most cases you can still view the tree in a plain text, non-interactive representation. Those species which are represented in the seed alignment for this domain are highlighted.
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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 SH2 domain has been found. There are 847 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 sequence.
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AlphaFold Structure Predictions
The list of proteins below match this family and have AlphaFold predicted structures. Click on the protein accession to view the predicted structure.