UniProtKB/Swiss-Prot P02766: Variant p.Leu131Met

Transthyretin
Gene: TTR
Chromosomal location: 18q12.1
Variant information

Variant position:  131
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 Leucine (L) to Methionine (M) at position 131 (L131M, p.Leu131Met).
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:  2
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

Variant description:  In AMYL-TTR.
Any additional useful information about the variant.



Sequence information

Variant position:  131
The position of the amino-acid change on the UniProtKB canonical protein sequence.

Protein sequence length:  147
The length of the canonical sequence.

Location on the sequence:   AEVVFTANDSGPRRYTIAAL  L SPYSYSTTAVVTNPKE
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                         AEVVFTANDSGPRRYTIAALLSPYSYSTTAVVTNPKE---

Chimpanzee                    AEVVFTANDSGPRRYTIAALLSPYSYSTTAVVTIPKE

Mouse                         ADVVFTANDSGHRHYTIAALLSPYSYSTTAVVSNPQN

Rat                           AEVVFTANDSGHRHYTIAALLSPYSYSTTAVVSNPQN

Pig                           AEVVFTANDSGRRHYTIAALLSPYSYSTTALVSSPKE

Bovine                        AEVVFTANDSGPRHYTIAALLSPYSYSTTALVSSPKA

Rabbit                        AEVVFTANDSGHRSYTIAALLSPFSYSTTAVVSNPQE

Sheep                         AEVVFTANDSGLRHYTIAALLSPYSYSTTALVSSPKE

Chicken                       ADVVFTANDSGHRHYTIAALLSPFSYSTTAVVSDPQE

Xenopus laevis                VDVVFTANDAGHRHYTIAVLLTPYSFSSTAIVSEPHD

Xenopus tropicalis            VDVVFSANDAGHRHYTIAVLLTPYSISSTAVVSEPHD

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 21 – 147 Transthyretin
Glycosylation 118 – 118 N-linked (GlcNAc...)
Mutagenesis 130 – 130 L -> M. Loss of tetramerization; when associated with M-107.
Beta strand 124 – 132


Literature citations

Genetic microheterogeneity of human transthyretin detected by IEF.
Altland K.; Benson M.D.; Costello C.E.; Ferlini A.; Hazenberg B.P.C.; Hund E.; Kristen A.V.; Linke R.P.; Merlini G.; Salvi F.; Saraiva M.J.; Singer R.; Skinner M.; Winter P.;
Electrophoresis 28:2053-2064(2007)
Cited for: VARIANTS AMYL-TTR PRO-32; ILE-40; SER-44; ALA-50; MET-50; LEU-53; VAL-53; PRO-56; THR-65; ALA-67; ALA-69; ILE-69; ALA-80; LEU-84; LEU-88; ALA-91; TYR-97; PHE-98; SER-104; ASN-104; THR-104; ALA-114; GLY-117; ASN-126; MET-127; VAL-127; MET-131 AND ILE-142; VARIANTS ILE-33; SER-121 AND THR-129; VARIANT CHICAGO MET-139;

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.