Tau protein

Last updated

MAPT
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases MAPT , DDPAC, FTDP-17, MAPTL, MSTD, MTBT1, MTBT2, PPND, PPP1R103, TAU, microtubule associated protein tau, Tau proteins, tau-40
External IDs OMIM: 157140; MGI: 97180; HomoloGene: 74962; GeneCards: MAPT; OMA:MAPT - orthologs
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_001038609
NM_010838
NM_001285454
NM_001285455
NM_001285456

RefSeq (protein)
Location (UCSC) Chr 17: 45.89 – 46.03 Mb Chr 11: 104.23 – 104.33 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

The tau proteins (abbreviated from tubulin associated unit [5] ) form a group of six highly soluble protein isoforms produced by alternative splicing from the gene MAPT (microtubule-associated protein tau). [6] [7] They have roles primarily in maintaining the stability of microtubules in axons and are abundant in the neurons of the central nervous system (CNS), where the cerebral cortex has the highest abundance. [8] They are less common elsewhere but are also expressed at very low levels in CNS astrocytes and oligodendrocytes. [9]

Pathologies and dementias of the nervous system such as Alzheimer's disease and Parkinson's disease [10] are associated with tau proteins that have become hyperphosphorylated insoluble aggregates called neurofibrillary tangles. The tau proteins were identified in 1975 as heat-stable proteins essential for microtubule assembly, [5] [11] and since then they have been characterized as intrinsically disordered proteins. [12]

Neurons were grown in tissue culture and stained with antibody to MAP2 protein in green and MAP tau in red using the immunofluorescence technique. MAP2 is found only in dendrites and perikarya, while tau is found not only in the dendrites and perikarya but also in axons. As a result, axons appear red while the dendrites and perikarya appear yellow, due to superimposition of the red and green signals. DNA is shown in blue using the DAPI stain which highlights the nuclei. Image courtesy EnCor Biotechnology Inc. MAP2-tau in neurons.jpg
Neurons were grown in tissue culture and stained with antibody to MAP2 protein in green and MAP tau in red using the immunofluorescence technique. MAP2 is found only in dendrites and perikarya, while tau is found not only in the dendrites and perikarya but also in axons. As a result, axons appear red while the dendrites and perikarya appear yellow, due to superimposition of the red and green signals. DNA is shown in blue using the DAPI stain which highlights the nuclei. Image courtesy EnCor Biotechnology Inc.

Function

Microtubule stabilization

Tau proteins are found more often in neurons than in non-neuronal cells in humans. One of tau's main functions is to modulate the stability of axonal microtubules. [11] [13] Other nervous system microtubule-associated proteins (MAPs) may perform similar functions, as suggested by tau knockout mice that did not show abnormalities in brain development – possibly because of compensation in tau deficiency by other MAPs. [14] [15] [16]

Although tau is present in dendrites at low levels, where it is involved in postsynaptic scaffolding, [17] it is active primarily in the distal portions of axons, where it provides microtubule stabilization but also flexibility as needed. Tau proteins interact with tubulin to stabilize microtubules and promote tubulin assembly into microtubules. [11] Tau has two ways of controlling microtubule stability: isoforms and phosphorylation.

In addition to its microtubule-stabilizing function, Tau has also been found to recruit signaling proteins and to regulate microtubule-mediated axonal transport. [18]

mRNA translation

Tau is a negative regulator of mRNA translation in Drosophila , [13] mouse, [19] and human [20] brains, through its binding to ribosomes, which results in impaired ribosomal function, [21] reduction of protein synthesis and altered synaptic function. [13] [20] Tau interacts specifically with several ribosomal proteins, including the crucial regulator of translation rpS6. [22]

Behavior

The primary non-cellular functions of tau is to negatively regulate long-term memory [13] and to facilitate habituation (a form of non-associative learning), [13] two higher and more integrated physiological functions. Since regulation of tau is critical for memory, this could explain the linkage between tauopathies and cognitive impairment.

In mice, while the reported tau knockout strains present without overt phenotype when young, [14] [23] [24] when aged, they show some muscle weakness, hyperactivity, and impaired fear conditioning. [25] However, neither spatial learning in mice, [25] [26] [27] nor short-term memory (learning) in Drosophila [13] seems to be affected by the absence of tau.

In addition, tau knockout mice have abnormal sleep-wake cycle, with increased wakefulness periods and decreased non-rapid eye movements (NREM) sleep time. [28]

Other functions

Other typical functions of tau include cellular signalling, neuronal development, neuroprotection and apoptosis. [15] Atypical, non-standard roles of tau [29] are also under current investigation, such as its involvement in chromosome stability, its interaction with the cellular transcriptome, its interaction with other cytoskeletal or synaptic proteins, its involvement in myelination or in brain insulin signaling, its role in the exposure to chronic stress and in depression, etc.

Genetics

In humans, the MAPT gene for encoding tau protein is located on chromosome 17q21, containing 16 exons. [30] The major tau protein in the human brain is encoded by 11 exons. Exons 2, 3 and 10 are alternatively spliced, which leads to the formation of six tau isoforms. [31] In the human brain, tau proteins constitute a family of six isoforms with a range of 352–441 amino acids. Tau isoforms are different in having either zero, one, or two inserts of 29 amino acids at the N-terminal part (exons 2 and 3) and three or four repeat-regions at the C-terminal part (exon 10). Thus, the longest isoform in the CNS has four repeats (R1, R2, R3 and R4) and two inserts (441 amino acids total), while the shortest isoform has three repeats (R1, R3 and R4) and no insert (352 amino acids total).

The MAPT gene has two haplogroups, H1 and H2, in which the gene appears in inverted orientations. Haplogroup H2 is common only in Europe and in people with European ancestry. Haplogroup H1 appears to be associated with increased probability of certain dementias, such as Alzheimer's disease. The presence of both haplogroups in Europe means that recombination between inverted haplotypes can result in the lack of one of the functioning copies of the gene, resulting in congenital defects. [32] [33] [34] [35]

Structure

Six tau isoforms exist in human brain tissue, and they are distinguished by their number of binding domains. Three isoforms have three binding domains and the other three have four binding domains. The binding domains are located in the carboxy-terminus of the protein and are positively charged (allowing it to bind to the negatively charged microtubule). The isoforms with four binding domains are better at stabilizing microtubules than those with three binding domains. Tau is a phosphoprotein with 79 potential serine (Ser) and threonine (Thr) phosphorylation sites on the longest tau isoform. Phosphorylation has been reported on approximately 30 of these sites in normal tau proteins. [36]

Phosphorylation of tau is regulated by a host of kinases, including PKN, a serine/threonine kinase. When PKN is activated, it phosphorylates tau, resulting in disruption of microtubule organization. [37] Phosphorylation of tau is also developmentally regulated. For example, fetal tau is more highly phosphorylated in the embryonic CNS than adult tau. [38] The degree of phosphorylation in all six isoforms decreases with age due to the activation of phosphatases. [39] Like kinases, phosphatases too play a role in regulating the phosphorylation of tau. For example, PP2A and PP2B are both present in human brain tissue and have the ability to dephosphorylate Ser396. [40] The binding of these phosphatases to tau affects tau's association with microtubules.

Phosphorylation of tau has also been suggested to be regulated by O-GlcNAc modification at various Ser and Thr residues. [41]

Mechanism

The accumulation of hyperphosphorylated tau in neurons is associated with neurofibrillary degeneration. [42] The actual mechanism of how tau propagates from one cell to another is not well identified. Also, other mechanisms, including tau release and toxicity, are unclear. As tau aggregates, it replaces tubulin, which in turn enhances fibrilization of tau. [43] Several propagation methods have been proposed that occur by synaptic contact such as synaptic cell adhesion proteins, neuronal activity and other synaptic and non-synaptic mechanisms. [44] The mechanism of tau aggregation is still not completely elucidated, but several factors favor this process, including tau phosphorylation and zinc ions. [45] [46]

Release

Tau is involved in uptake and release processes, which are known as seeding. Uptake of tau protein requires the presence of heparan sulfate proteoglycans at the cell surface, which happens by macropinocytosis. [47] On the other hand, tau release depends on neuronal activity. Many factors influence tau release such as, for example, the isoforms or MAPT mutations that change the extracellular level of tau. [48] According to Asai and his colleagues, the spreading of tau protein occurs from the entorhinal cortex to the hippocampal region in the early stages of the disease. They also suggested that microglia were also involved in the transport process, and their actual role is still unknown. [49]

Toxicity

Tau causes toxic effects through its accumulation inside cells. Many enzymes are involved in toxicity mechanism such as PAR-1 kinase. This enzyme stimulates phosphorylation of serine 262 and 356, which in turn leads to activate other kinases (GSK-3 and CDK5) that cause disease-associated phosphoepitopes. [50] The degree of toxicity is affected by different factors, such as the degree of microtubule binding. [51] [52] Toxicity could also happen by neurofibrillary tangles (NFTs), which leads to cell death and cognitive decline.

Clinical significance

Hyperphosphorylation of the tau protein (tau inclusions, pTau) can result in the self-assembly of tangles of paired helical filaments and straight filaments, which are involved in the pathogenesis of Alzheimer's disease, frontotemporal dementia and other tauopathies. [53] All of the six tau isoforms are present in an often hyperphosphorylated state in paired helical filaments in the Alzheimer's disease brain. In other neurodegenerative diseases, the deposition of aggregates enriched in certain tau isoforms has been reported. When misfolded, this otherwise very soluble protein can form extremely insoluble aggregates that contribute to a number of neurodegenerative diseases. Tau protein has a direct effect on the breakdown of a living cell caused by tangles that form and block nerve synapses. [54]

Gender-specific tau gene expression across different regions of the human brain has recently been implicated in gender differences in the manifestations and risk for tauopathies. [55] Some aspects of how the disease functions also suggest that it has some similarities to prion proteins. [56]

Tau hypothesis of Alzheimer's disease

The tau hypothesis states that excessive or abnormal phosphorylation of tau results in the transformation of normal adult tau into paired-helical-filament (PHF) tau and neurofibrillary tangles (NFTs). [57] The stage of the disease determines NFTs' phosphorylation. In AD, at least 19 amino acids are phosphorylated; pre-NFT phosphorylation occurs at serine 199, 202 and 409, while intra-NFT phosphorylation happens at serine 396 and threonine 231. [58] Through its isoforms and phosphorylation, tau protein interacts with tubulin to stabilize microtubule assembly. All of the six tau isoforms are present in an often hyperphosphorylated state in paired helical filaments (PHFs) in the AD brain.

Tau mutations have many consequences, including microtubule dysfunction and alteration of the expression level of tau isoforms. [59] Mutations that alter function and isoform expression of tau lead to hyperphosphorylation. The process of tau aggregation in the absence of mutations is not known but might result from increased phosphorylation, protease action or exposure to polyanions, such as glycosaminoglycans. Hyperphosphorylated tau disassembles microtubules and sequesters normal tau, MAPT 1 (microtubule associated protein tau 1), MAPT 2 and ubiquitin into tangles of PHFs. This insoluble structure damages cytoplasmic functions and interferes with axonal transport, which can lead to cell death. [60] [54]

Hyperphosphorylated forms of tau protein are the main component of PHFs of NFTs in the brain of AD patients. It has been well demonstrated that regions of tau six-residue segments, namely PHF6 (VQIVYK) and PHF6* (VQIINK), can form tau PHF aggregation in AD. Apart from the PHF6, some other residue sites like Ser285, Ser289, Ser293, Ser305 and Tyr310, located near the C-terminal of the PHF6 sequences, play key roles in the phosphorylation of tau. [61] Hyperphosphorylated tau differs in its sensitivity and its kinase as well as alkaline phosphatase activity [62] and is, along with beta-amyloid, a component of the pathologic lesion seen in Alzheimer disease. [63] [64] A recent hypothesis identifies the decrease of reelin signaling as the primary change in Alzheimer's disease that leads to the hyperphosphorylation of tau via a decrease in GSK3β inhibition. [65]

A68 is a name sometimes given (mostly in older publications) to the hyperphosphorylated form of tau protein found in the brains of individuals with Alzheimer's disease. [66]

In 2020, researchers from two groups published studies indicating that an immunoassay blood test for the p-tau-217 form of the protein could diagnose Alzheimer's up to decades before dementia symptoms were evident. [67] [68] [69]

Traumatic brain injury

Repetitive mild traumatic brain injury (TBI) is a central component of contact sports, especially American football, [70] [71] and the concussive force of military blasts. [72] It can lead to chronic traumatic encephalopathy (CTE), a condition characterized by fibrillar tangles of hyperphosphorylated tau. [73] After severe traumatic brain injury, high levels of tau protein in extracellular fluid in the brain are linked to poor outcomes. [74]

Prion-like propagation hypothesis

The term "prion-like" is often used to describe several aspects of tau pathology in various tauopathies, like Alzheimer's disease and frontotemporal dementia. [75] True prions are defined by their ability to induce misfolding of native proteins to perpetuate the pathology. True prions, like PRNP, are also infectious with the capability to cross species. Since tau has yet to be proven to be infectious it is not considered to be a true prion but instead a "prion-like" protein. Much like true prions, pathological tau aggregates have been shown to have the capacity to induce misfolding of native tau protein. [76] Both misfolding competent and non-misfolding competent species of tau aggregates have been reported, indicating a highly specific mechanism. [77]

Interactions

Tau protein has been shown to interact with:

See also

Related Research Articles

<span class="mw-page-title-main">Frontotemporal dementia</span> Types of dementia involving the frontal or temporal lobes

Frontotemporal dementia (FTD), also called frontotemporal degeneration disease or frontotemporal neurocognitive disorder, encompasses several types of dementia involving the progressive degeneration of the brain's frontal and temporal lobes. Men and women appear to be equally affected. FTD generally presents as a behavioral or language disorder with gradual onset. Signs and symptoms tend to appear in late adulthood, typically between the ages of 45 and 65, although it can affect people younger or older than this. Currently, no cure or approved symptomatic treatment for FTD exists, although some off-label drugs and behavioral methods are prescribed.

<span class="mw-page-title-main">Amyloid beta</span> Group of peptides

Amyloid beta denotes peptides of 36–43 amino acids that are the main component of the amyloid plaques found in the brains of people with Alzheimer's disease. The peptides derive from the amyloid-beta precursor protein (APP), which is cleaved by beta secretase and gamma secretase to yield Aβ in a cholesterol-dependent process and substrate presentation. Both neurons and oligodendrocytes produce and release Aβ in the brain, contributing to formation of amyloid plaques. Aβ molecules can aggregate to form flexible soluble oligomers which may exist in several forms. It is now believed that certain misfolded oligomers can induce other Aβ molecules to also take the misfolded oligomeric form, leading to a chain reaction akin to a prion infection. The oligomers are toxic to nerve cells. The other protein implicated in Alzheimer's disease, tau protein, also forms such prion-like misfolded oligomers, and there is some evidence that misfolded Aβ can induce tau to misfold.

In cell biology, microtubule-associated proteins (MAPs) are proteins that interact with the microtubules of the cellular cytoskeleton. MAPs are integral to the stability of the cell and its internal structures and the transport of components within the cell.

<span class="mw-page-title-main">Amyloid plaques</span> Extracellular deposits of the amyloid beta protein

Amyloid plaques are extracellular deposits of the amyloid beta (Aβ) protein mainly in the grey matter of the brain. Degenerative neuronal elements and an abundance of microglia and astrocytes can be associated with amyloid plaques. Some plaques occur in the brain as a result of aging, but large numbers of plaques and neurofibrillary tangles are characteristic features of Alzheimer's disease. The plaques are highly variable in shape and size; in tissue sections immunostained for Aβ, they comprise a log-normal size distribution curve, with an average plaque area of 400-450 square micrometers (μm2). The smallest plaques, which often consist of diffuse deposits of Aβ, are particularly numerous. Plaques form when Aβ misfolds and aggregates into oligomers and longer polymers, the latter of which are characteristic of amyloid.

<span class="mw-page-title-main">Frontotemporal lobar degeneration</span> Atrophy of the brains frontal and temporal lobes

Frontotemporal lobar degeneration (FTLD) is a pathological process that occurs in frontotemporal dementia. It is characterized by atrophy in the frontal lobe and temporal lobe of the brain, with sparing of the parietal and occipital lobes.

<span class="mw-page-title-main">Neurofibrillary tangle</span> Aggregates of tau protein known as a biomarker of Alzheimers disease

Neurofibrillary tangles (NFTs) are intracellular aggregates of hyperphosphorylated tau protein that are most commonly known as a primary biomarker of Alzheimer's disease. Their presence is also found in numerous other diseases known as tauopathies. Little is known about their exact relationship to the different pathologies.

<span class="mw-page-title-main">Corticobasal degeneration</span> Rare neurodegenerative disease

Corticobasal degeneration (CBD) is a rare neurodegenerative disease involving the cerebral cortex and the basal ganglia. CBD symptoms typically begin in people from 50 to 70 years of age, and typical survival before death is eight years. It is characterized by marked disorders in movement and cognition, and is classified as one of the Parkinson plus syndromes. Diagnosis is difficult, as symptoms are often similar to those of other disorders, such as Parkinson's disease, progressive supranuclear palsy, and dementia with Lewy bodies, and a definitive diagnosis of CBD can only be made upon neuropathologic examination.

<span class="mw-page-title-main">Major prion protein</span> Protein involved in multiple prion diseases

The major prion protein (PrP) is encoded in the human body by the PRNP gene also known as CD230. Expression of the protein is most predominant in the nervous system but occurs in many other tissues throughout the body.

<span class="mw-page-title-main">Tauopathy</span> Medical condition

Tauopathies are a class of neurodegenerative diseases characterized by the aggregation of abnormal tau protein. Hyperphosphorylation of tau proteins causes them to dissociate from microtubules and form insoluble aggregates called neurofibrillary tangles. Various neuropathologic phenotypes have been described based on the anatomical regions and cell types involved as well as the unique tau isoforms making up these deposits. The designation 'primary tauopathy' is assigned to disorders where the predominant feature is the deposition of tau protein. Alternatively, diseases exhibiting tau pathologies attributed to different and varied underlying causes are termed 'secondary tauopathies'. Some neuropathologic phenotypes involving tau protein are Alzheimer's disease, frontotemporal dementia, progressive supranuclear palsy, and corticobasal degeneration.

<span class="mw-page-title-main">Neurodegenerative disease</span> Central nervous system disease

A neurodegenerative disease is caused by the progressive loss of neurons, in the process known as neurodegeneration. Neuronal damage may also ultimately result in their death. Neurodegenerative diseases include amyotrophic lateral sclerosis, multiple sclerosis, Parkinson's disease, Alzheimer's disease, Huntington's disease, multiple system atrophy, tauopathies, and prion diseases. Neurodegeneration can be found in the brain at many different levels of neuronal circuitry, ranging from molecular to systemic.Because there is no known way to reverse the progressive degeneration of neurons, these diseases are considered to be incurable; however research has shown that the two major contributing factors to neurodegeneration are oxidative stress and inflammation. Biomedical research has revealed many similarities between these diseases at the subcellular level, including atypical protein assemblies and induced cell death. These similarities suggest that therapeutic advances against one neurodegenerative disease might ameliorate other diseases as well.

<span class="mw-page-title-main">Frontotemporal dementia and parkinsonism linked to chromosome 17</span> Medical condition

Frontotemporal dementia and parkinsonism linked to chromosome 17 (FTDP-17) is an autosomal dominant neurodegenerative tauopathy and Parkinson plus syndrome. FTDP-17 is caused by mutations in the MAPT gene located on the q arm of chromosome 17, and has three cardinal features: behavioral and personality changes, cognitive impairment, and motor symptoms. FTDP-17 was defined during the International Consensus Conference in Ann Arbor, Michigan, in 1996.

The biochemistry of Alzheimer's disease, the most common cause of dementia, is not yet very well understood. Alzheimer's disease (AD) has been identified as a proteopathy: a protein misfolding disease due to the accumulation of abnormally folded amyloid beta (Aβ) protein in the brain. Amyloid beta is a short peptide that is an abnormal proteolytic byproduct of the transmembrane protein amyloid-beta precursor protein (APP), whose function is unclear but thought to be involved in neuronal development. The presenilins are components of proteolytic complex involved in APP processing and degradation.

<span class="mw-page-title-main">Proteinopathy</span> Diseases caused by abnormal protein structure

In medicine, proteinopathy, or proteopathy, protein conformational disorder, or protein misfolding disease, is a class of diseases in which certain proteins become structurally abnormal, and thereby disrupt the function of cells, tissues and organs of the body.

<span class="mw-page-title-main">MAP4</span> Protein-coding gene in the species Homo sapiens

Microtubule-associated protein 4 is a protein that in humans is encoded by the MAP4 gene.

<span class="mw-page-title-main">MARK1</span> Protein-coding gene in the species Homo sapiens

Serine/threonine-protein kinase MARK1 is an enzyme that in humans is encoded by the MARK1 gene.

<span class="mw-page-title-main">PHKG1</span> Protein-coding gene in the species Homo sapiens

Phosphorylase b kinase gamma catalytic chain, skeletal muscle isoform is an enzyme that in humans is encoded by the PHKG1 gene.

<span class="mw-page-title-main">TMEM106B</span> Protein-coding gene in humans

Transmembrane protein 106B is a protein that is encoded by the TMEM106B gene. It is found primarily within neurons and oligodendrocytes in the central nervous system with its subcellular location being in lysosomal membranes. TMEM106B helps facilitate important functions for maintaining a healthy lysosome, and therefore certain mutations and polymorphisms can lead to issues with proper lysosomal function. Lysosomes are in charge of clearing out mis-folded proteins and other debris, and thus, play an important role in neurodegenerative diseases that are driven by the accumulation of various mis-folded proteins and aggregates. Due to its impact on lysosomal function, TMEM106B has been investigated and found to be associated to multiple neurodegenerative diseases.

Maria Grazia Spillantini, is Professor of Molecular Neurology in the Department of Clinical Neurosciences at the University of Cambridge. She is most noted for identifying the protein alpha-synuclein as the major component of Lewy bodies, the characteristic protein deposit found in the brain in Parkinson's disease and dementia with Lewy bodies. She has also identified mutations in the MAPT gene as a heritable cause for frontotemporal dementia.

Primary age-related tauopathy (PART) is a neuropathological designation introduced in 2014 to describe the neurofibrillary tangles (NFT) that are commonly observed in the brains of normally aged and cognitively impaired individuals that can occur independently of the amyloid plaques of Alzheimer's disease (AD). The term and diagnostic criteria for PART were developed by a large group of neuropathologists, spearheaded by Drs. John F. Crary and Peter T. Nelson. Despite some controversy, the term PART has been widely adopted, with the consensus criteria cited over 1130 times as of April 2023 according to Google Scholar.

<span class="mw-page-title-main">Neurotubule</span>

Neurotubules are microtubules found in neurons in nervous tissues. Along with neurofilaments and microfilaments, they form the cytoskeleton of neurons. Neurotubules are undivided hollow cylinders that are made up of tubulin protein polymers and arrays parallel to the plasma membrane in neurons. Neurotubules have an outer diameter of about 23 nm and an inner diameter, also known as the central core, of about 12 nm. The wall of a neurotubule is about 5 nm in width. There is a non-opaque clear zone surrounding the neurotubule and it is about 40 nm in diameter. Like microtubules, neurotubules are greatly dynamic and their length can be adjusted by polymerization and depolymerization of tubulin.

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