Key Points
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This review discusses the many protein tyrosine phosphatases (PTPs) that are expressed by T cells and our current understanding of their biology and roles in human disease.
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T cells express ∼50–60 different PTPs.
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CD45, SHP2 (SRC homology 2 (SH2)-domain-containing PTP 2), and LMPTP (low-molecular-weight PTP) mainly have positive roles in signalling through the T-cell receptor.
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SHP1, LYP (lymphoid-specific PTP), PTP-PEST (PTP with PEST (proline-, glutamic-acid-, serine- and threonine-rich) domains), PTP-HSCF (PTP haematopoietic stem-cell fraction) and PTPH1 (PTP H1) are potent negative regulators of T-cell activation.
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HEPTP (haematopoietic PTP) and many dual-specific PTPs dephosphorylate mitogen-activated protein kinases.
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PTP-MEG2 (PTP megakaryocyte 2) regulates secretory vesicles.
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A polymorphism in LYP is associated with autoimmune disease.
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Some pathogens use PTPs for immune evasion.
Abstract
Reversible tyrosine phosphorylation of proteins is a key regulatory mechanism for numerous important aspects of eukaryotic physiology and is catalysed by kinases and phosphatases. Together, cells of the immune system express at least half of the 107 protein tyrosine phosphatase (PTP) genes in the human genome, most of which encode multidomain proteins that contain protein- and phospholipid-interaction domains. Here, we discuss the diverse but specific, and important, roles that PTPs have in immune cells, focusing mainly on T and B cells, and we highlight recent evidence that even subtle alterations in PTPs can cause immune dysfunction and human disease.
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Acknowledgements
We apologize for being unable (owing to space limitations) to cite many important contributions made by our colleagues in the field. T.M. is supported by the National Institutes of Health, United States. T.V. is supported by The Norwegian Cancer Society. N.B. is supported by the American Italian Cancer Foundation, United States, and The Litta Foundation, Switzerland.
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Glossary
- POLYCLONALLY ACTIVATED
-
Activation of all T cells by mitogens in an antigen-independent manner.
- BLASTOID MORPHOLOGY
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The larger size and appearance of an activated T cell.
- SRC FAMILY
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A group of structurally related cytoplasmic and/or membrane-associated enzymes that are named after the prototypical member, SRC. In haematopoietic cells, SRC kinases — such as LCK, FYN and LYN — are the first protein tyrosine kinases that are activated after stimulation through the immunoreceptors. They phosphorylate ITAMs (immunoreceptor tyrosine-based activation motifs) that are present in the signal-transducing subunits of the immunoreceptors, thereby providing binding sites for SRC homology 2 (SH2)-domain-containing molecules, such as SYK (spleen tyrosine kinase).
- SRC HOMOLOGY 2 DOMAIN
-
(SH2 domain). A protein domain that is commonly found in signal-transduction molecules. It specifically recognizes phosphotyrosine-containing peptide sequences in proteins.
- SH3 DOMAIN
-
(SRC homology 3 domain). A protein domain that is commonly found in signal-transduction molecules. It specifically interacts with certain proline-containing peptides. Classically, it contains either (R/K)XXPXXP or PXXPXR motifs, where X denotes any amino acid.
- ERM DOMAIN
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A protein–protein interaction domain found in ezrin, radixin and moesin.
- N-LINKED CARBOHYDRATES
-
Sugars that are attached to asparagine residues of proteins.
- O-LINKED CARBOHYDRATES
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Sugars that are attached to serine and/or threonine residues of proteins.
- MYRISTOYLATION
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The covalent attachment of a hydrophobic myristoyl group to the amino-terminal glycine residue of a nascent polypeptide.
- FARNESYLATION
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The covalent addition of farnesyl (15 carbon) isoprenoids to proteins at cysteine residues by farnesyl transferases, which leads to their constitutive association with the plasma membrane.
- LIPID RAFT
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Area of the plasma membrane that is rich in cholesterol, glycosphingolipids, several signalling proteins (such as SRC kinases, RAS, LAT and PAG) and glycosylphosphatidylinositol-anchored proteins. Also known as glycolipid-enriched membrane domains (GEMs) and detergent-insoluble glycolipid-enriched membranes (DIGs).
- FLUORESCENCE RESONANCE ENERGY TRANSFER
-
(FRET). This is used to measure protein–protein interactions microscopically or by a FACS (fluorescence-activated cell sorter)-based method. Proteins fused to cyan, yellow or red fluorescent proteins are expressed and assessed for interaction by measuring the energy transfer between fluorophores, which can only occur if proteins physically interact. FRET can also be used to examine the activation state of certain proteins if their activation results in specific protein–protein interactions.
- cSMAC
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(Central supramolecular activation cluster). The central region of the immune synapse.
- RNA INTERFERENCE
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(RNAi). The use of double-stranded RNAs with sequences that precisely match a given gene to 'knock-down' the expression of that gene by directing RNA-degrading enzymes to destroy the encoded mRNA transcript.
- FOCAL ADHESION PLAQUE
-
The closest contact site of a cell with its environment, which is formed by integrin clustering. The integrins link the extracellular environment to the actin cytoskeleton by a complex assembly of adaptor proteins.
- PDZ DOMAIN
-
(PSD95, DLGA and ZO1 homology domain). A protein domain that is commonly found in signal-transduction molecules. It can interact with different amino-acid motifs that are present at the carboxyl terminus of proteins. PDZ domains can also interact with other PDZ domains, with certain internal peptide sequences and even with lipids.
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Mustelin, T., Vang, T. & Bottini, N. Protein tyrosine phosphatases and the immune response. Nat Rev Immunol 5, 43–57 (2005). https://doi.org/10.1038/nri1530
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DOI: https://doi.org/10.1038/nri1530
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