UniProtKB/Swiss-Prot P10636: Variant p.Val654Met

Microtubule-associated protein tau
Gene: MAPT
Chromosomal location: 17q21.1
Variant information

Variant position:  654
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Type of variant:  Disease [Disclaimer]
The variants are classified into three categories: Disease, Polymorphism and Unclassified.
  • Disease: Variants have been found in patients and disease-association is reported in literature. However, this classification is not a definitive assessment of variant pathogenicity.
  • Polymorphism: No disease-association has been reported.
  • Unclassified: Variants have been found in patients but disease-association remains unclear.

Residue change:  From Valine (V) to Methionine (M) at position 654 (V654M, p.Val654Met).
Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.

Physico-chemical properties:  Similar physico-chemical property. Both residues are medium size and hydrophobic.
The physico-chemical property of the reference and variant residues and the change implicated.

BLOSUM score:  1
The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:
  • Lowest score: -4 (low probability of substitution).
  • Highest score: 11 (high probability of substitution).
More information can be found on the following page

Involvement in disease:  Frontotemporal dementia (FTD) [MIM:600274]: A form of dementia characterized by pathologic finding of frontotemporal lobar degeneration, presenile dementia with behavioral changes, deterioration of cognitive capacities and loss of memory. In some cases, parkinsonian symptoms are prominent. Neuropathological changes include frontotemporal atrophy often associated with atrophy of the basal ganglia, substantia nigra, amygdala. In most cases, protein tau deposits are found in glial cells and/or neurons. Note=The disease is caused by mutations affecting the gene represented in this entry.
The name and a short description of the disease associated with the variant. For more information about the disease, the user can refer to OMIM, following the link provided after the disease acronym.

Variant description:  In FTD; ultrastructural and biochemical characteristics indistinguishable from Alzheimer disease; accelerates aggregation of tau into filaments.
Any additional useful information about the variant.



Sequence information

Variant position:  654
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  758
The length of the canonical sequence.

Location on the sequence:   KVTSKCGSLGNIHHKPGGGQ  V EVKSEKLDFKDRVQSKIGSL
The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.

Residue conservation: 
The multiple alignment of the region surrounding the variant against various orthologous sequences.

Human                         KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Gorilla                       KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Rhesus macaque                KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Chimpanzee                    KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Mouse                         KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Rat                           KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Bovine                        KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Goat                          KVTSKCGSLGNIHHKPGGGQVEVKSEKLDFKDRVQSKIGSL

Sequence annotation in neighborhood:  
The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:
  • Type: the type of sequence feature.
  • Positions: endpoints of the sequence feature.
  • Description: contains additional information about the feature.

TypePositionsDescription
Chain 2 – 758 Microtubule-associated protein tau
Repeat 654 – 685 Tau/MAP 4
Site 634 – 634 Not glycated
Site 638 – 638 Not glycated
Site 648 – 648 Not glycated
Site 657 – 657 Not glycated
Site 660 – 660 Not glycated
Modified residue 641 – 641 Phosphoserine; by MARK1; in PHF-tau
Modified residue 669 – 669 Phosphoserine; by PHK
Modified residue 673 – 673 Phosphoserine; by MARK1; in PHF-tau
Glycosylation 664 – 664 N-linked (Glc) (glycation); in PHF-tau; in vitro
Glycosylation 670 – 670 N-linked (Glc) (glycation); in PHF-tau; in vitro
Cross 670 – 670 Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin); in PHF-tau


Literature citations

Tau is a candidate gene for chromosome 17 frontotemporal dementia.
Poorkaj P.; Bird T.D.; Wijsman E.; Nemens E.; Garruto R.M.; Anderson L.; Andreadis A.; Wiederholt W.C.; Raskind M.; Schellenberg G.D.;
Ann. Neurol. 43:815-825(1998)
Cited for: VARIANT FTD MET-654; VARIANTS ASN-285; ALA-289; HIS-441 AND PRO-447;

Accelerated filament formation from tau protein with specific FTDP-17 missense mutations.
Nacharaju P.; Lewis J.; Easson C.; Yen S.; Hackett J.; Hutton M.; Yen S.H.;
FEBS Lett. 447:195-199(1999)
Cited for: VARIANTS FTD LEU-618; MET-654 AND TRP-723;

Disclaimer: Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. They are not in any way intended to be used as a substitute for professional medical advice, diagnostic, treatment or care.